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ulozto.cz

ulozto.cz is SSL secured

Free website and domain report on ulozto.cz

Last Updated: 14th July, 2021 Update Now
Overview

Snoop Summary for ulozto.cz

This is a free and comprehensive report about ulozto.cz. Ulozto.cz is hosted in Sobeslav, Jihocesky kraj in Czechia on a server with an IP address of 77.48.29.200, where the local currency is CZK and Czech is the local language. Our records indicate that ulozto.cz is owned/operated by Uloz.to cloud a.s.. Ulozto.cz is expected to earn an estimated $137 USD per day from advertising revenue. The sale of ulozto.cz would possibly be worth $100,234 USD. This figure is based on the daily revenue potential of the website over a 24 month period. Ulozto.cz is wildly popular with an estimated 32,465 daily unique visitors. This report was last updated 14th July, 2021.

About ulozto.cz

Site Preview: ulozto.cz ulozto.cz
Title: Rapidshare uloz.to! |
Description: Ulož.to je československou jedničkou pro svobodné sdílení souborů. Nahrávejte, sdílejte a stahujte zdarma. Kredit umožní i stahování neomezenou rychlostí.
Keywords and Tags: personal network storage, popular
Related Terms: delavska hranilnica kredit za sp, downloader ulozto, kredit goturmek isteyirem, sdileni, stahni to ulozto, stanovanjski kredit, uloz, uloz to, ulozto cz, www ulozto ct
Fav Icon:
Age: Over 16 years old
Domain Created: 4th May, 2007
Domain Updated: 30th May, 2017
Domain Expires: 4th May, 2022
Review

Snoop Score

4/5 (Excellent!)

Valuation

$100,234 USD
Note: All valuation figures are estimates.

Popularity

High
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 23,564
Alexa Reach:
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority: 0
Moz Page Authority: 0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors: 32,465
Monthly Visitors: 988,146
Yearly Visitors: 11,849,883
Note: All visitors figures are estimates.

Visitors By Country

Revenue

Revenue

Daily Revenue: $137 USD
Monthly Revenue: $4,179 USD
Yearly Revenue: $50,112 USD
Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top New Follow Links

Top Ranking Keywords (US)

Domain Analysis

Value Length
Domain: ulozto.cz 9
Domain Name: ulozto 6
Extension (TLD): cz 2
Expiry Check:

Page Speed Analysis

Average Load Time: 1.93 seconds
Load Time Comparison: Faster than 44% of sites

PageSpeed Insights

Avg. (All Categories) 92
Performance 84
Accessibility 100
Best Practices 87
SEO 100
Progressive Web App 91
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://ulozto.cz/
Updated: 14th July, 2021

1.33 seconds
First Contentful Paint (FCP)
84%
8%
8%

0.00 seconds
First Input Delay (FID)
97%
2%
1%

Simulate loading on desktop
84

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for ulozto.cz. This includes details about optimizing page load times which can result in a better user experience.

Metrics

First Contentful Paint — 0.8 s
The time taken for the first image or text on the page to be rendered.
Time to Interactive — 0.9 s
The time taken for the page to become fully interactive.
Total Blocking Time — 0 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Cumulative Layout Shift — 0.01
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

Max Potential First Input Delay — 40 ms
Users could experience a delay when interacting with the page.
First Meaningful Paint — 0.9 s
The time taken for the primary content of the page to be rendered.
Network Requests
Below is a list of network requests that were made during page load.
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http://ulozto.cz/
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h2
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Script
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http/1.1
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Image
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Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
1036.023
8.325
1582.287
5.643
1693.201
45.363
1738.579
8.77
1752.595
31.874
1784.529
6.679
1816.304
17.027
1834.639
11.083
1847.334
7.301
1865.323
23.347
1908.419
5.067
1927.557
20.232
1947.834
6.377
1962.671
21.409
1992.935
70.475
2063.821
10.54
3126.54
17.973
3800.703
6.738
4134.193
8.573
4244.271
8.215
4474.033
14.841
4489.075
20.078
5057.652
9.578
5086.074
8.346
5095.358
9.044
5212.736
7.193
5255.716
24.703
5280.469
7.212
5996.979
6.045
6014.226
13.8
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Opportunities

Properly size images — Potential savings of 163 KiB
Images can slow down the page's load time. Ulozto.cz should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://thumbs.uloz.to/z/i/s/xziswas1.640x360.4.jpg?vt=1626386399&sg=KNpWpztwoCSVT73yu5Fbgg&bl=
66210
58469
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
39948
35278
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
31341
27677
https://thumbs.uloz.to/7/p/A/x7pAJ5n9.640x360.3.jpg?vt=1626386399&sg=d7pg--IU6s4bhVxewTxvUQ&bl=
27282
24092
https://thumbs.uloz.to/a/r/W/xarWuf7K.640x360.7.jpg?vt=1626386399&sg=tACXd6SOcMx0RctKFVM5iQ&bl=
24680
21795
Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Ulozto.cz should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Ulozto.cz should consider minifying CSS files.
Minify JavaScript — Potential savings of 39 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Ulozto.cz should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://code.jquery.com/jquery-1.11.0.js
83986
39839
Reduce unused CSS — Potential savings of 34 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Ulozto.cz should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://static.uloz.to/ul3/css/ulozto.css?v=3.300.298
27251
22724
https://static.uloz.to/ul3/css/ulozto-extra-file-search.css?v=3.300.298
11736
11697
Efficiently encode images — Potential savings of 14 KiB
Unoptimized images can consume more cellular data than what is necessary.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://static.uloz.to/content/HP/teaser-main-01.jpg
66294
14770
Enable text compression — Potential savings of 46 KiB
Text-based resources should be served with compression, such as gzip, deflate or brotli.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://pw.uloz.to/pw.js
70428
46739
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Avoid multiple page redirects — Potential savings of 190 ms
Redirects can cause additional delays before the page can begin loading. Ulozto.cz should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://ulozto.cz/
190
https://ulozto.cz/
0
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Ulozto.cz should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 0 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch.js
92
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
64
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.
URL Potential Savings (Ms)
https://static.uloz.to/content/HP/hp_anonymous_plain.png
0

Diagnostics

Avoids enormous network payloads — Total size was 1,668 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image-scratch.png
378933
https://static.uloz.to/content/HP/hp_anonymous_plain.png
239586
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image.png
116511
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
101510
https://code.jquery.com/jquery-1.11.0.js
83986
https://pw.uloz.to/pw.js
70676
https://static.uloz.to/content/HP/teaser-main-01.jpg
66675
https://thumbs.uloz.to/z/i/s/xziswas1.640x360.4.jpg?vt=1626386399&sg=KNpWpztwoCSVT73yu5Fbgg&bl=
66646
https://www.googletagmanager.com/gtm.js?id=GTM-T8FDDK
45984
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
45020
Avoids an excessive DOM size — 420 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
420
Maximum DOM Depth
Máte strach z meteoru?
18
Maximum Child Elements
Máte strach z meteoru? Dáš si cheesecake? Umíš si vyrobit loď? 31s.cz - Pravidl…
15
Avoid chaining critical requests — 6 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Ulozto.cz should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 0.2 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
182.552
133.405
4.222
https://ulozto.cz/
147.714
6.485
3.66
Unattributable
102.642
3.226
0.189
Minimizes main-thread work — 0.8 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
341.69
Other
181.494
Style & Layout
90.682
Rendering
62.342
Script Parsing & Compilation
40.496
Parse HTML & CSS
36.686
Garbage Collection
9.426
All text remains visible during webfont loads
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
Keep request counts low and transfer sizes small — 73 requests • 1,668 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
73
1708392
Image
28
1066357
Script
25
469136
Font
7
108094
Stylesheet
3
42820
Document
6
20070
Other
4
1915
Media
0
0
Third-party
70
1696436
Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
83986
0
SHOW DETAILS
45984
0
SHOW DETAILS
23036
0
SHOW DETAILS
16218
0
SHOW DETAILS
1416
0
SHOW DETAILS
1365
0
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Nevíš kam teď s fotkama? My máme místa dost! Zjistit více
Avoid large layout shifts — 1 element found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Hledat video, audio, obrázky a další soubory Hledat soubory Nahrát soubory
0.010459133175729
Avoid long main-thread tasks
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
Avoid non-composited animations — 1 animated element found
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Element Name
::after

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

Speed Index — 2.2 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 2.3 s
The timing of the largest text or image that is painted.

Opportunities

Eliminate render-blocking resources — Potential savings of 180 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Ulozto.cz should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://static.uloz.to/ul3/css/ulozto.css?v=3.300.298
27251
270
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
101510
80
Reduce unused JavaScript — Potential savings of 183 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://code.jquery.com/jquery-1.11.0.js
83986
57585
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
101510
54693
https://pw.uloz.to/pw.js
70676
44569
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
45020
30644
Serve images in next-gen formats — Potential savings of 582 KiB
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image-scratch.png
378552
224800
https://static.uloz.to/content/HP/hp_anonymous_plain.png
239205
223607
https://static.uloz.to/content/HP/teaser-main-01.jpg
66294
48050
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image.png
116130
43726
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
39948
12404
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
31341
11869
https://thumbs.uloz.to/7/p/A/x7pAJ5n9.640x360.3.jpg?vt=1626386399&sg=d7pg--IU6s4bhVxewTxvUQ&bl=
27282
11660
https://thumbs.uloz.to/a/r/W/xarWuf7K.640x360.7.jpg?vt=1626386399&sg=tACXd6SOcMx0RctKFVM5iQ&bl=
24680
10694
https://thumbs.uloz.to/z/i/s/xziswas1.640x360.4.jpg?vt=1626386399&sg=KNpWpztwoCSVT73yu5Fbgg&bl=
66210
9396

Opportunities

Reduce initial server response time — Root document took 640 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://ulozto.cz/
636.378

Diagnostics

Serve static assets with an efficient cache policy — 50 resources found
Ulozto.cz can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://pw.uloz.to/pw.js
0
70676
https://www.google-analytics.com/plugins/ua/linkid.js
3600000
1476
https://www.google-analytics.com/analytics.js
7200000
20313
https://go.eu.bbelements.com/please/code?i-17114.8.14.64.1920.1500.0.0.0.0.0.0._blank
10783000
3141
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image-scratch.png
43200000
378933
https://static.uloz.to/content/HP/hp_anonymous_plain.png
43200000
239586
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image.png
43200000
116511
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
43200000
101510
https://static.uloz.to/content/HP/teaser-main-01.jpg
43200000
66675
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
43200000
45020
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
43200000
45020
https://static.uloz.to/ul3/css/ulozto.css?v=3.300.298
43200000
27251
https://static.uloz.to/common/fonts/FontIcon.woff2?v=3.300.298
43200000
20450
https://static.uloz.to/common/fonts/OpenSans-SemiBold.woff2?v=3.300.298
43200000
16558
https://static.uloz.to/common/fonts/OpenSans-Light.woff2?v=3.300.298
43200000
16546
https://static.uloz.to/common/fonts/OpenSans-Regular.woff2?v=3.300.298
43200000
15966
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/hp_box/assets/pozadi.png
43200000
15141
https://static.uloz.to/javascript/lib/jquery/jquery.slick.min.js?v=3.300.298
43200000
14737
https://static.uloz.to/common/fonts/OpenSans-SemiBold-Ext.woff2?v=3.300.298
43200000
13086
https://static.uloz.to/common/fonts/OpenSans-Light-Ext.woff2?v=3.300.298
43200000
12806
https://static.uloz.to/common/fonts/OpenSans-Regular-Ext.woff2?v=3.300.298
43200000
12682
https://static.uloz.to/ul3/css/ulozto-extra-file-search.css?v=3.300.298
43200000
11736
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch-cursor.png
43200000
10513
https://static.uloz.to/ul3/images/homepage/badge-gallery-cz.svg
43200000
8609
https://static.uloz.to/ul3/images/homepage/bg-mobile.png?v=3.300.298
43200000
8221
https://static.uloz.to/javascript/require.js?v=3.300.292
43200000
7699
https://static.uloz.to/javascript/require.js?v=3.300.292
43200000
7699
https://static.uloz.to/ul3/images/live/category-c107.svg
43200000
7674
https://static.uloz.to/ul3/images/homepage/badge-store-cz.svg
43200000
6007
https://static.uloz.to/ul3/images/homepage/badge-play-cz.svg
43200000
5449
https://static.uloz.to/ul3/css/ulozto-extra-homepage.css?v=3.300.298
43200000
3833
https://static.uloz.to/ul3/images/live/category-c104.svg
43200000
1987
https://static.uloz.to/javascript/lib/modernizr.js?v=3.300.298
43200000
1967
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch.js
43200000
1768
https://static.uloz.to/ul3/images/live/category-c108.svg
43200000
1456
https://static.uloz.to/javascript/darkMode.js?v=3.300.298
43200000
1394
https://static.uloz.to/ul3/images/live/category-c109.svg
43200000
1390
https://static.uloz.to/ul3/images/live/category-c105.svg
43200000
1310
https://static.uloz.to/common/images/ico/vector/play-grid.svg?v=3.300.298
43200000
854
https://static.uloz.to/common/images/ico/vector/flag-cz.svg?v=3.300.298
43200000
809
https://static.uloz.to/ul3/images/live/category-c111.svg
43200000
754
https://static.uloz.to/javascript/nodus/frameDetect.js?v=3.300.298
43200000
528
https://thumbs.uloz.to/z/i/s/xziswas1.640x360.4.jpg?vt=1626386399&sg=KNpWpztwoCSVT73yu5Fbgg&bl=
172800000
66646
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
172800000
40384
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
172800000
31776
https://thumbs.uloz.to/7/p/A/x7pAJ5n9.640x360.3.jpg?vt=1626386399&sg=d7pg--IU6s4bhVxewTxvUQ&bl=
172800000
27717
https://thumbs.uloz.to/a/r/W/xarWuf7K.640x360.7.jpg?vt=1626386399&sg=tACXd6SOcMx0RctKFVM5iQ&bl=
172800000
25116
https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
604800000
5406
https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
604800000
5406
https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
604800000
5406
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Source
SHOW DETAILS
Avoid `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Source
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
Image elements do not have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
URL Failing Elements
https://thumbs.uloz.to/z/i/s/xziswas1.640x360.4.jpg?vt=1626386399&sg=KNpWpztwoCSVT73yu5Fbgg&bl=
img
https://thumbs.uloz.to/z/i/s/xziswas1.640x360.4.jpg?vt=1626386399&sg=KNpWpztwoCSVT73yu5Fbgg&bl=
img
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
img
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
img
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
img
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
img
https://thumbs.uloz.to/7/p/A/x7pAJ5n9.640x360.3.jpg?vt=1626386399&sg=d7pg--IU6s4bhVxewTxvUQ&bl=
img
https://thumbs.uloz.to/7/p/A/x7pAJ5n9.640x360.3.jpg?vt=1626386399&sg=d7pg--IU6s4bhVxewTxvUQ&bl=
img
https://thumbs.uloz.to/a/r/W/xarWuf7K.640x360.7.jpg?vt=1626386399&sg=tACXd6SOcMx0RctKFVM5iQ&bl=
img
https://thumbs.uloz.to/a/r/W/xarWuf7K.640x360.7.jpg?vt=1626386399&sg=tACXd6SOcMx0RctKFVM5iQ&bl=
img
100

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of ulozto.cz. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Contrast

Background and foreground colors have a sufficient contrast ratio
Many (if not most) users find low-contrast text difficult or impossible to read.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Ulozto.cz may provide assistance to deaf or hearing-impaired users with captions on videos.

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
87

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that ulozto.cz should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Links to cross-origin destinations are safe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
jQuery
3.5.1
RequireJS
2.3.6
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
https://static.uloz.to/javascript/ulozto.min.js.map
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
https://static.uloz.to/javascript/advertFrame.min.js.map
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://ulozto.cz/
Allowed

Audits

Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Source Description
SHOW DETAILS
unable to open database (14 sqlite_open returned null)
SHOW DETAILS
unable to open database (14 sqlite_open returned null)
SHOW DETAILS
unable to open database (14 sqlite_open returned null)
100

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for ulozto.cz. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of ulozto.cz on mobile screens.
Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
91

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of ulozto.cz. This includes details about web app manifests.

Installable

Web app manifest and service worker meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Sets a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of ulozto.cz on mobile screens.
Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest has a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 83
Performance 45
Accessibility 92
Best Practices 87
SEO 99
Progressive Web App 92
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://ulozto.cz/
Updated: 14th July, 2021

1.57 seconds
First Contentful Paint (FCP)
81%
12%
7%

0.03 seconds
First Input Delay (FID)
91%
7%
2%

Simulate loading on mobile
45

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for ulozto.cz. This includes details about optimizing page load times which can result in a better user experience.

Other

Max Potential First Input Delay — 120 ms
Users could experience a delay when interacting with the page.
Network Requests
Below is a list of network requests that were made during page load.
URL Protocol Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://ulozto.cz/
http/1.1
0
213.02200003993
267
0
301
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Font
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h2
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h2
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h2
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h2
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h2
650.65500000492
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16558
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Font
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h2
650.89699998498
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13086
12692
200
application/octet-stream
Font
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h2
653.28199998476
1074.8989999993
27251
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text/css
Stylesheet
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h2
653.52699998766
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Stylesheet
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h2
653.73500005808
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11736
56757
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Stylesheet
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h2
654.03199999128
1074.047000031
101510
263047
200
application/x-javascript
Script
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h2
654.33100005612
964.97199998703
1967
3410
200
application/x-javascript
Script
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h2
654.55300000031
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1394
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application/x-javascript
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h2
1076.3659999939
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h2
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h2
1112.6180000138
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h2
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Image
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h2
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h2
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h2
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h2
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h2
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h2
1114.9180000648
1147.0340000233
45983
146783
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application/javascript
Script
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h2
1161.4009999903
1272.4249999737
528
180
200
application/x-javascript
Script
https://static.uloz.to/javascript/lib/jquery/jquery.slick.min.js?v=3.300.298
h2
1227.5000000373
1337.8240000457
14737
53180
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application/x-javascript
Script
https://www.google-analytics.com/analytics.js
h2
1274.0449999692
1279.9019999802
20313
49377
200
text/javascript
Script
https://pw.uloz.to/pw.js
http/1.1
1281.6870000679
2225.7140000584
70676
70428
200
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Script
https://www.google-analytics.com/plugins/ua/linkid.js
h2
1312.3950000154
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1477
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Script
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h2
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h2
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Image
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http/1.1
2246.2440000381
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200
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Image
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h2
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Document
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h2
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Document
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h2
2914.0589999733
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Script
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h2
2914.1800000798
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45020
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Script
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h2
2997.9799999855
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XHR
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h2
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Script
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
h2
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109368
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application/x-javascript
Script
https://go.eu.bbelements.com/please/code?i-17114.8.14.64.1920.1500.0.0.0.0.0.0._blank
http/1.1
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application/javascript
Script
https://go.eu.bbelements.com/please/showit/17114/8/14/64/?typkodu=html&ubl=en-US&ucd=24&uce=1&uje=0&uah=640&uaw=360&uhe=640&uwi=360&uto=420&uti=1626231036807&__INWIDTH=360&__INHEIGHT=1500&href=https%3A//advert.uloz.to/ads/ad-4435.html%3Flogged%3D0%26page%3D%26origin%3Dulozto.cz%26adult%3D0%26hide_video%3D0&bgcolor=FFFFFF&text=000000&link=0000FF&bust=0.9901790094498035&target=_blank
http/1.1
3937.8809999907
4925.7750000106
2649
5152
200
text/html
Document
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/hp_box/index.html?redir=https%3A%2F%2Fgo.eu.bbelements.com%2Fplease%2Fredirect%2F17114%2F8%2F2%2F64%2F!uwi%3D360%2Cuhe%3D640%2Cuce%3D0%2Cibbid%3D%2CimpressionId%3D89d66092-cc22-4d72-ba32-7d4e6c2d2830%2Cibb_device_id%3D1%2Cip_co%3D6%2Cip_reg%3D0%2Cb_w%3D465%2Cb_h%3D265%2Ctcf2%3D15%2Cparam%3D1018268%2F980100_1_%3F&bbtarget=_blank
h2
4216.7580000823
4358.0749999965
1497
2542
200
text/html
Document
https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
http/1.1
4217.6190000027
5121.4829999954
5406
12978
200
application/javascript
Script
https://code.jquery.com/jquery-1.11.0.js
h2
4370.6800000509
4395.620000083
83986
282944
200
application/javascript
Script
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/hp_box/assets/pozadi.png
h2
4371.0250000004
4580.8889999753
15141
14762
200
image/png
Image
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
h2
4592.4850000301
4803.6230000434
40384
39948
200
image/jpeg
Image
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch.js
h2
4938.8560000807
5046.2299999781
1768
3204
200
application/x-javascript
Script
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image-top.png
h2
4940.1820000494
5359.0969999786
156856
156475
200
image/png
Image
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image.png
h2
5068.2609999785
5502.7930000797
116511
116130
200
image/png
Image
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch-cursor.png
h2
5068.4790000087
5357.151000062
10513
10134
200
image/png
Image
https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
5075.838000048
0
0
-1
Script
https://bbnaut.ibillboard.com/g/co
5129.2140000733
0
0
-1
Script
https://bbnaut.ibillboard.com/initidmatch?force=1&gdpr=1&gdpr_consent=null
5140.0900000008
0
0
-1
Script
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
647.92
7.223
1083.245
5.118
1094.012
27.632
1121.658
16.219
1140.095
28.751
1188.232
15.714
1211.555
7.008
1219.624
13.892
1239.257
5.212
1264.197
25.07
1307.048
5.299
1314.853
15.77
1335.934
21.013
1363.36
57.855
1421.396
8.828
2238.259
15.352
2911.089
7.404
3016.363
6.008
3246.858
20.601
3274.632
5.483
3351.97
14.978
3936.088
8.783
4212.855
6.118
4220.78
6.259
4367.851
7.375
4412.206
23.917
4935.539
5.848
5054.717
22.723
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Opportunities

Properly size images — Potential savings of 14 KiB
Images can slow down the page's load time. Ulozto.cz should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
39948
7765
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
31341
6092
Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Ulozto.cz should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Ulozto.cz should consider minifying CSS files.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 430 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://ulozto.cz/
425.063
Avoid multiple page redirects — Potential savings of 630 ms
Redirects can cause additional delays before the page can begin loading. Ulozto.cz should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://ulozto.cz/
630
https://ulozto.cz/
0
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Ulozto.cz should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 0 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch.js
92
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
64
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.
URL Potential Savings (Ms)
https://static.uloz.to/content/HP/hp_anonymous_plain.png
0

Diagnostics

Avoids enormous network payloads — Total size was 1,321 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://static.uloz.to/content/HP/hp_anonymous_plain.png
239586
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image-top.png
156856
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image.png
116511
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
101510
https://code.jquery.com/jquery-1.11.0.js
83986
https://pw.uloz.to/pw.js
70676
https://static.uloz.to/content/HP/teaser-main-01.jpg
66675
https://www.googletagmanager.com/gtm.js?id=GTM-T8FDDK
45983
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
45020
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
45020
Avoids an excessive DOM size — 420 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
420
Maximum DOM Depth
Umíš si vyrobit loď?
18
Maximum Child Elements
Umíš si vyrobit loď? Tenkrát online - Multifest Dáš si cheesecake? KOMA - Sanit…
15
Avoid chaining critical requests — 6 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Ulozto.cz should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
All text remains visible during webfont loads
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
Keep request counts low and transfer sizes small — 64 requests • 1,321 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
64
1352437
Image
23
715807
Script
21
463730
Font
7
108094
Stylesheet
3
42820
Document
6
20071
Other
4
1915
Media
0
0
Third-party
61
1340482
Minimize third-party usage — Third-party code blocked the main thread for 70 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
45983
37.224
SHOW DETAILS
23038
32.588
SHOW DETAILS
83986
0
SHOW DETAILS
10812
0
SHOW DETAILS
1416
0
SHOW DETAILS
1400
0
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Nevíš kam teď s fotkama? My máme místa dost! Zjistit více
Avoid large layout shifts — 2 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
reklamní sdělení
0.2660986086743
Sledujte videa zdarma Umíš si vyrobit loď? Tenkrát online - Multifest Dáš si ch…
0.10844973116945
Avoid long main-thread tasks — 11 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://static.uloz.to/javascript/lib/jquery/jquery.slick.min.js?v=3.300.298
8340
116
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
3955
115
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
3844
111
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch.js
9440
91
https://www.google-analytics.com/plugins/ua/linkid.js
6455
84
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
9240
82
https://www.google-analytics.com/analytics.js
6392
63
https://pw.uloz.to/pw.js
7292
61
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
9335
60
https://www.googletagmanager.com/gtm.js?id=GTM-T8FDDK
5185
56
https://www.googletagmanager.com/gtm.js?id=GTM-T8FDDK
5262
50
Avoid non-composited animations — 1 animated element found
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Element Name
::after

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

First Contentful Paint — 2.8 s
The time taken for the first image or text on the page to be rendered.
Total Blocking Time — 240 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Other

First Meaningful Paint — 3.4 s
The time taken for the primary content of the page to be rendered.

Opportunities

Minify JavaScript — Potential savings of 39 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Ulozto.cz should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://code.jquery.com/jquery-1.11.0.js
83986
39839
Reduce unused CSS — Potential savings of 34 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Ulozto.cz should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://static.uloz.to/ul3/css/ulozto.css?v=3.300.298
27251
23556
https://static.uloz.to/ul3/css/ulozto-extra-file-search.css?v=3.300.298
11736
11697
Efficiently encode images — Potential savings of 14 KiB
Unoptimized images can consume more cellular data than what is necessary.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://static.uloz.to/content/HP/teaser-main-01.jpg
66294
14770
Enable text compression — Potential savings of 46 KiB
Text-based resources should be served with compression, such as gzip, deflate or brotli.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://pw.uloz.to/pw.js
70428
46739

Diagnostics

Reduce JavaScript execution time — 1.4 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
592.08
453.572
18.52
https://ulozto.cz/
471.824
23.42
12.316
Unattributable
331.748
10.828
0.568
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
185.696
139.76
17.472
https://www.googletagmanager.com/gtm.js?id=GTM-T8FDDK
173.32
131.712
21.024
https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
135.056
106.092
4.176
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch.js
115.852
84.328
1.48
https://code.jquery.com/jquery-1.11.0.js
89.476
52.956
18.264
https://www.google-analytics.com/plugins/ua/linkid.js
88.704
85.9
1.152
https://advert.uloz.to/ads/ad-7578.html?logged=0&page=&origin=ulozto.cz&adult=0&hide_video=0
78.156
11.236
6.016
https://www.google-analytics.com/analytics.js
71.292
58.088
4.444
https://pw.uloz.to/pw.js
68.044
57.792
6.26
https://go.eu.bbelements.com/please/showit/17114/8/2/64/?typkodu=html&ubl=en-US&ucd=24&uce=1&uje=0&uah=640&uaw=360&uhe=640&uwi=360&uto=420&uti=1626231036129&href=https%3A//advert.uloz.to/ads/ad-7578.html%3Flogged%3D0%26page%3D%26origin%3Dulozto.cz%26adult%3D0%26hide_video%3D0&__INWIDTH=320&__INHEIGHT=260&bgcolor=FFFFFF&text=000000&link=0000FF&bust=0.5915832037747935&target=_blank
64.116
19.768
5.256
https://advert.uloz.to/ads/ad-4435.html?logged=0&page=&origin=ulozto.cz&adult=0&hide_video=0
57.364
5.36
3.808
https://go.eu.bbelements.com/please/showit/17114/8/14/64/?typkodu=html&ubl=en-US&ucd=24&uce=1&uje=0&uah=640&uaw=360&uhe=640&uwi=360&uto=420&uti=1626231036807&__INWIDTH=360&__INHEIGHT=1500&href=https%3A//advert.uloz.to/ads/ad-4435.html%3Flogged%3D0%26page%3D%26origin%3Dulozto.cz%26adult%3D0%26hide_video%3D0&bgcolor=FFFFFF&text=000000&link=0000FF&bust=0.9901790094498035&target=_blank
56.76
16.664
5.616
https://static.uloz.to/javascript/require.js?v=3.300.292
54.184
37.292
13.58
Minimize main-thread work — 2.8 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
1339.024
Other
671.688
Style & Layout
284.136
Rendering
185.556
Script Parsing & Compilation
156.476
Parse HTML & CSS
129.668
Garbage Collection
7.9

Metrics

Speed Index — 6.7 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 8.5 s
The timing of the largest text or image that is painted.
Time to Interactive — 7.9 s
The time taken for the page to become fully interactive.
Cumulative Layout Shift — 0.375
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Opportunities

Eliminate render-blocking resources — Potential savings of 850 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Ulozto.cz should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://static.uloz.to/ul3/css/ulozto.css?v=3.300.298
27251
930
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
101510
600
Reduce unused JavaScript — Potential savings of 183 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://code.jquery.com/jquery-1.11.0.js
83986
57585
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
101510
54741
https://pw.uloz.to/pw.js
70676
44569
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
45020
30644
Serve images in next-gen formats — Potential savings of 448 KiB
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://static.uloz.to/content/HP/hp_anonymous_plain.png
239205
223607
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image-top.png
156475
119245
https://static.uloz.to/content/HP/teaser-main-01.jpg
66294
48050
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image.png
116130
43726
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
39948
12404
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
31341
11869

Diagnostics

Serve static assets with an efficient cache policy — 44 resources found
Ulozto.cz can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://pw.uloz.to/pw.js
0
70676
https://www.google-analytics.com/plugins/ua/linkid.js
3600000
1477
https://www.google-analytics.com/analytics.js
7200000
20313
https://go.eu.bbelements.com/please/code?i-17114.8.14.64.1920.1500.0.0.0.0.0.0._blank
10786000
3141
https://static.uloz.to/content/HP/hp_anonymous_plain.png
43200000
239586
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image-top.png
43200000
156856
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-image.png
43200000
116511
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
43200000
101510
https://static.uloz.to/content/HP/teaser-main-01.jpg
43200000
66675
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
43200000
45020
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
43200000
45020
https://static.uloz.to/ul3/css/ulozto.css?v=3.300.298
43200000
27251
https://static.uloz.to/common/fonts/FontIcon.woff2?v=3.300.298
43200000
20450
https://static.uloz.to/common/fonts/OpenSans-SemiBold.woff2?v=3.300.298
43200000
16558
https://static.uloz.to/common/fonts/OpenSans-Light.woff2?v=3.300.298
43200000
16546
https://static.uloz.to/common/fonts/OpenSans-Regular.woff2?v=3.300.298
43200000
15966
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/hp_box/assets/pozadi.png
43200000
15141
https://static.uloz.to/javascript/lib/jquery/jquery.slick.min.js?v=3.300.298
43200000
14737
https://static.uloz.to/common/fonts/OpenSans-SemiBold-Ext.woff2?v=3.300.298
43200000
13086
https://static.uloz.to/common/fonts/OpenSans-Light-Ext.woff2?v=3.300.298
43200000
12806
https://static.uloz.to/common/fonts/OpenSans-Regular-Ext.woff2?v=3.300.298
43200000
12682
https://static.uloz.to/ul3/css/ulozto-extra-file-search.css?v=3.300.298
43200000
11736
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch-cursor.png
43200000
10513
https://static.uloz.to/ul3/images/homepage/badge-gallery-cz.svg
43200000
8609
https://static.uloz.to/javascript/require.js?v=3.300.292
43200000
7699
https://static.uloz.to/javascript/require.js?v=3.300.292
43200000
7699
https://static.uloz.to/ul3/images/live/category-c107.svg
43200000
7674
https://static.uloz.to/ul3/images/homepage/badge-store-cz.svg
43200000
6007
https://static.uloz.to/ul3/images/homepage/badge-play-cz.svg
43200000
5449
https://static.uloz.to/ul3/css/ulozto-extra-homepage.css?v=3.300.298
43200000
3833
https://static.uloz.to/ul3/images/live/category-c104.svg
43200000
1987
https://static.uloz.to/javascript/lib/modernizr.js?v=3.300.298
43200000
1967
https://static.uloz.to/staticadvert/branding/2021/Zasilkovna_7-8_2021/branding_ex/branding-scratch.js
43200000
1768
https://static.uloz.to/ul3/images/live/category-c108.svg
43200000
1456
https://static.uloz.to/javascript/darkMode.js?v=3.300.298
43200000
1394
https://static.uloz.to/ul3/images/live/category-c109.svg
43200000
1390
https://static.uloz.to/ul3/images/live/category-c105.svg
43200000
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https://static.uloz.to/common/images/ico/vector/play-grid.svg?v=3.300.298
43200000
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https://static.uloz.to/ul3/images/live/category-c111.svg
43200000
754
https://static.uloz.to/javascript/nodus/frameDetect.js?v=3.300.298
43200000
528
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
172800000
40384
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
172800000
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https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
604800000
5406
https://bbcdn-bbnaut.ibillboard.com/library/bbnaut-lib-latest.min.js
604800000
5406
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Source
SHOW DETAILS
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SHOW DETAILS
Avoid `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Source
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
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SHOW DETAILS
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Image elements do not have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
URL Failing Elements
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
img
https://thumbs.uloz.to/3/b/1/x3b1ehTX.640x360.9.jpg?vt=1626386399&sg=A6ZPwqcjn1-haFbYnauxVQ&bl=
img
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
img
https://thumbs.uloz.to/K/E/Q/xKEQRyx3.640x360.3.jpg?vt=1626386399&sg=lPK-BMysfk7E4O4CmMVV4A&bl=
img

Other

First Contentful Paint (3G) — 5601 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.
92

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of ulozto.cz. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Contrast

Background and foreground colors have a sufficient contrast ratio
Many (if not most) users find low-contrast text difficult or impossible to read.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Names and labels

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Ulozto.cz may provide assistance to deaf or hearing-impaired users with captions on videos.

Names and labels

Buttons do not have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Failing Elements
button
Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
87

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that ulozto.cz should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Links to cross-origin destinations are safe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
jQuery
3.5.1
RequireJS
2.3.6
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://static.uloz.to/javascript/ulozto.min.js?v=3.300.298
https://static.uloz.to/javascript/ulozto.min.js.map
https://static.uloz.to/javascript/advertFrame.min.js?v=3.300.292
https://static.uloz.to/javascript/advertFrame.min.js.map
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://ulozto.cz/
Allowed

Audits

Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Source Description
SHOW DETAILS
unable to open database (14 sqlite_open returned null)
SHOW DETAILS
unable to open database (14 sqlite_open returned null)
SHOW DETAILS
unable to open database (14 sqlite_open returned null)
99

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for ulozto.cz. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of ulozto.cz on mobile screens.
Document uses legible font sizes — 97.75% legible text
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Source Selector % of Page Text Font Size
SHOW DETAILS
.ad-homepage .adTitle
1.06%
8px
SHOW DETAILS
.page-branding .ad-branding .adFull .adTitle
1.06%
8px
SHOW DETAILS
.slick-carousel .slick-dots li button
0.13%
0px
SHOW DETAILS
97.75%
≥ 12px

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Mobile Friendly

Tap targets are not sized appropriately — 92% appropriately sized tap targets
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.
Tap Target Size Overlapping Target
« Předchozí
36x36
KOMA - Sanitka
Instalovat do počítače
132x18
Huawei Appgallery

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
92

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of ulozto.cz. This includes details about web app manifests.

Installable

Web app manifest and service worker meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Sets a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of ulozto.cz on mobile screens.
Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest has a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 77.48.29.200
Continent: Europe
Country: Czechia
Czechia Flag
Region: Jihocesky kraj
City: Sobeslav
Longitude: 14.7167
Latitude: 49.2667
Currencies: CZK
Languages: Czech
Slovak

Web Hosting Provider

Name IP Address
Nubium Development SE
Registration

Domain Registrant

Private Registration: No
Name: Uloz.to cloud a.s. Uloz.to cloud a.s.
Organization: Uloz.to cloud a.s.
Country:
City:
State:
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Safe
WOT Rating:
WOT Trustworthiness: 89/100
WOT Child Safety: 68/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: *.ulozto.cz
Issued By: R3
Valid From: 24th June, 2021
Valid To: 22nd September, 2021
Subject: CN = *.ulozto.cz
Hash: 29d663e2
Issuer: CN = R3
O = Let's Encrypt
S = US
Version: 2
Serial Number: 0x03EB379D861BD08FFAD9971267634EBAC1FD
Serial Number (Hex): 03EB379D861BD08FFAD9971267634EBAC1FD
Valid From: 24th June, 2024
Valid To: 22nd September, 2024
Signature Algorithm (Short Name): RSA-SHA256
Signature Algorithm (Long Name): sha256WithRSAEncryption
Authority Key Identifier: keyid:14:2E:B3:17:B7:58:56:CB:AE:50:09:40:E6:1F:AF:9D:8B:14:C2:C6
Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
Certificate Policies: Policy: 2.23.140.1.2.1
Policy: 1.3.6.1.4.1.44947.1.1.1
CPS: http://cps.letsencrypt.org
Authority Information Access: OCSP - URI:http://r3.o.lencr.org
CA Issuers - URI:http://r3.i.lencr.org/
SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 7D:3E:F2:F8:8F:FF:88:55:68:24:C2:C0:CA:9E:52:89:
79:2B:C5:0E:78:09:7F:2E:6A:97:68:99:7E:22:F0:D7
Timestamp : Jun 24 05:31:10.495 2021 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:21:00:BA:D6:56:C1:08:DF:3B:EF:F9:0D:4B:
5D:EC:58:33:F3:05:FE:25:DF:12:40:E7:0D:F1:E6:71:
A3:09:4A:DD:1A:02:20:04:A9:CD:40:DB:A3:34:C1:0A:
B4:75:AD:9D:14:3E:24:AD:87:45:A3:C5:EA:4E:FF:A8:
D2:79:3B:67:98:62:00
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 94:20:BC:1E:8E:D5:8D:6C:88:73:1F:82:8B:22:2C:0D:
D1:DA:4D:5E:6C:4F:94:3D:61:DB:4E:2F:58:4D:A2:C2
Timestamp : Jun 24 05:31:10.786 2021 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:20:13:65:83:91:25:ED:98:1E:EF:4B:62:52:
79:C9:E5:98:EB:7B:DD:62:97:CE:C0:0F:9C:AF:A7:BB:
85:98:3F:DA:02:21:00:BC:1A:9E:25:B9:A3:60:76:61:
0E:DB:63:C6:3B:3A:C6:79:FD:BF:6E:00:66:94:09:6C:
83:2C:BC:97:A1:D8:F5
Key Usage: Digital Signature, Key Encipherment
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:ulozto.cz
DNS:*.ulozto.cz
Technical

DNS Lookup

A Records

Host IP Address Class TTL
ulozto.cz. 77.48.29.200 IN 59

NS Records

Host Nameserver Class TTL
ulozto.cz. ns1.nubium.cz. IN 599
ulozto.cz. ns1.nubium.ch. IN 599
ulozto.cz. ns1.nubium.in. IN 599
ulozto.cz. ns1.nubium.cn. IN 599

MX Records

Priority Host Server Class TTL
10 ulozto.cz. mail.ulozto.cz. IN 599

SOA Records

Domain Name Primary NS Responsible Email TTL
ulozto.cz. ns1.nubium.cz. noc.nubium.cz. 599

TXT Records

Host Value Class TTL
ulozto.cz. v=spf1 IN 299
ulozto.cz. google-site-verification=O5h9tYtYsPS69fqQhpjerpTelTa3592jL1ECOpu99oc IN 299
ulozto.cz. brave-ledger-verification=5b6209518ac7124d8fe6ed46c2204c762f93c4f630ead50f6e75fcf6c4fa401b IN 299

HTTP Response Headers

HTTP-Code: HTTP/1.1 301 Moved Permanently
server: nginx
date: 14th July, 2021
content-type: text/html
content-length: 178
location: https://ulozto.cz/
x-node-name: ulozto12
connection: close

Whois Lookup

Created: 4th May, 2007
Changed: 30th May, 2017
Expires: 4th May, 2022
Status:
Nameservers: ns1.nubium.ch
ns1.nubium.cn
ns1.nubium.cz
ns1.nubium.in
Owner Name: Uloz.to cloud a.s. Uloz.to cloud a.s.
Owner Organization: Uloz.to cloud a.s.
Admin Name: Uloz.to cloud a.s. Uloz.to cloud a.s.
Admin Organization: Uloz.to cloud a.s.
Full Whois: % (c) 2006-2021 CZ.NIC, z.s.p.o.
%
% Intended use of supplied data and information
%
% Data contained in the domain name register, as well as information
% supplied through public information services of CZ.NIC association,
% are appointed only for purposes connected with Internet network
% administration and operation, or for the purpose of legal or other
% similar proceedings, in process as regards a matter connected
% particularly with holding and using a concrete domain name.
%
% Full text available at:
% http://www.nic.cz/page/306/intended-use-of-supplied-data-and-information/
%
% See also a search service at http://www.nic.cz/whois/
%
%
% Whoisd Server Version: 3.12.2
% Timestamp: Wed Jul 14 02:50:03 2021

domain: ulozto.cz
registrant: ULOZTO-CLOUD
admin-c: ULOZTO-CLOUD
nsset: NUBIUM
keyset: NUBIUM
registrar: REG-GRANSY
registered: 04.05.2007 23:45:00
changed: 30.05.2017 23:06:25
expire: 04.05.2022

contact: ULOZTO-CLOUD
org: Uloz.to cloud a.s.
name: Uloz.to cloud a.s. Uloz.to cloud a.s.
address: Mezibranská 1579/4
address: Praha 1
address: 110 00
address: CZ
registrar: REG-GRANSY
created: 21.09.2015 14:15:11
changed: 11.03.2019 10:04:06

nsset: NUBIUM
nserver: ns1.nubium.cz (93.99.2.78)
nserver: ns1.nubium.cn
nserver: ns1.nubium.in
nserver: ns1.nubium.ch
tech-c: SUB-920497
registrar: REG-GRANSY
created: 08.01.2016 17:43:15
changed: 29.01.2021 10:43:03

contact: SUB-920497
org: Nubium Development SE
name: Stanislav Pacan
address: Újezd 450/40
address: Praha 1
address: 11000
address: CZ
registrar: REG-GRANSY
created: 08.01.2016 17:43:14
changed: 15.05.2018 21:32:00

keyset: NUBIUM
dnskey: 257 3 13 cVDGU74SMyfhX5AY+HW8RT4iW+mGAYOpFAGX3AqDgSRqYvTOSVnOxAS6lGj9nW7i/dHjAzYPl2LNYh6Hd7KdNg==
tech-c: NUBIUM
registrar: REG-GRANSY
created: 28.01.2016 12:15:18
changed: 29.01.2016 10:59:14

contact: NUBIUM
org: Nubium Development SE
name: Jan Karabina
address: Újezd 450/40, Malá Strana
address: Praha 1
address: 11800
address: CZ
registrar: REG-GRANSY
created: 26.10.2015 12:21:12
changed: 15.05.2018 21:32:00


View Raw Whois

Nameservers

Name IP Address
ns1.nubium.ch 93.99.2.79
ns1.nubium.cn 141.170.158.18
ns1.nubium.cz 93.99.2.78
ns1.nubium.in 217.182.75.103
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ulozto.sk
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