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name

value

score

weighting

FCP (First Contentful Paint)

Value3.7 s

29/100

10%

LCP (Largest Contentful Paint)

Value7.0 s

6/100

25%

SI (Speed Index)

Value11.5 s

5/100

10%

TBT (Total Blocking Time)

Value4,410 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.005

100/100

15%

TTI (Time to Interactive)

Value27.7 s

0/100

10%

pdf.online

129 ms

xodo.com

894 ms

lightbox_inline.js

596 ms

gtm.js

161 ms

fonts.css

205 ms

Our browser made a total of 105 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Pdf.online, 83% (87 requests) were made to Cdn.xodo.com and 3% (3 requests) were made to Lightboxcdn.com. The less responsive or slowest element that took the longest time to load (894 ms) relates to the external source Xodo.com.

Content Size

1.8 MB

After Optimization

1.4 MB

In fact, the total size of Pdf.online main page is 1.8 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. Only a small number of websites need less resources to load. Javascripts take 802.1 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 328.1 kB

Original 416.2 kB
After minification 416.2 kB
After compression 88.1 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 328.1 kB or 79% of the original size.

Image Optimization

-8%

Potential reduce by 43.2 kB

Original 534.1 kB
After minification 490.9 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. PDF images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 1.9 kB

Original 802.1 kB
After minification 802.1 kB
After compression 800.2 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. This website has mostly compressed JavaScripts.

CSS Optimization

-2%

Potential reduce by 213 B

Original 14.1 kB
After minification 14.1 kB
After compression 13.8 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Pdf.online has all CSS files already compressed.

Requests Now

103

After Optimization

The browser has sent 103 CSS, Javascripts, AJAX and image requests in order to completely render the main page of PDF. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 32 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

High

[aria-*] attributes do not match their roles

High

[aria-*] attributes do not have valid values

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve keyboard navigation in your application.

High

[id] attributes on active, focusable elements are not unique

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

High

Image elements do not have [alt] attributes

These items highlight common accessibility best practices.

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Search Engine Optimization Advices

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

High

Document uses legible font sizes

Language and Encoding

Language Detected

EN
Language Claimed

EN
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Pdf.online can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Pdf.online main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

Open Graph description is not detected on the main page of PDF. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: