Tools & Wizards About Us
pdfstacks.com screenshot

Report Summary

  • 19

    Performance

    Renders faster than
    36% of other websites

  • 71

    Accessibility

    Visual factors better than
    that of 36% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

pdfstacks.com

PDF Stacks - Organize, Read, Search, Share & Print PDF Files

Page Load Speed

2 sec in total

First Response

151 ms

Resources Loaded

1.5 sec

Page Rendered

336 ms

pdfstacks.com screenshot

About Website

Click here to check amazing PDF Stacks content for United States. Otherwise, check out these important facts you probably never knew about pdfstacks.com

PDF Stacks software program helps you organize and manage PDF files, papers and documents. Easily search and read your PDF documents on a PC and MAC

Visit pdfstacks.com

Key Findings

We analyzed Pdfstacks.com page load time and found that the first response time was 151 ms and then it took 1.8 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

pdfstacks.com performance score

19

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.8 s

56/100

10%

LCP (Largest Contentful Paint)

Value8.5 s

1/100

25%

SI (Speed Index)

Value8.1 s

21/100

10%

TBT (Total Blocking Time)

Value1,090 ms

24/100

30%

CLS (Cumulative Layout Shift)

Value0.468

19/100

15%

TTI (Time to Interactive)

Value14.8 s

8/100

10%

Network Requests Diagram

pdfstacks.com

151 ms

pdfstacks.com

330 ms

bootstrap.min.css

221 ms

bootstrap-theme.min.css

227 ms

main.css

171 ms

Our browser made a total of 40 requests to load all elements on the main page. We found that 50% of them (20 requests) were addressed to the original Pdfstacks.com, 13% (5 requests) were made to Youtube.com and 5% (2 requests) were made to My.hellobar.com. The less responsive or slowest element that took the longest time to load (559 ms) belongs to the original domain Pdfstacks.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 284.3 kB (28%)

Content Size

999.6 kB

After Optimization

715.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Pdfstacks.com main page is 999.6 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 620.5 kB which makes up the majority of the site volume.

HTML Optimization

-68%

Potential reduce by 13.4 kB

  • Original 19.8 kB
  • After minification 18.0 kB
  • After compression 6.4 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 13.4 kB or 68% of the original size.

Image Optimization

-43%

Potential reduce by 268.3 kB

  • Original 620.5 kB
  • After minification 352.2 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. Obviously, PDF Stacks needs image optimization as it can save up to 268.3 kB or 43% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-1%

Potential reduce by 2.6 kB

  • Original 299.7 kB
  • After minification 299.7 kB
  • After compression 297.2 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

-0%

Potential reduce by 0 B

  • Original 59.5 kB
  • After minification 59.5 kB
  • After compression 59.5 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. Pdfstacks.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 19 (51%)

Requests Now

37

After Optimization

18

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 37 CSS, Javascripts, AJAX and image requests in order to completely render the main page of PDF Stacks. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

pdfstacks.com

pdfstacks.com

151 ms

pdfstacks.com

pdfstacks.com

330 ms

bootstrap.min.css

bootstrap.min.css

221 ms

bootstrap-theme.min.css

bootstrap-theme.min.css

227 ms

main.css

main.css

171 ms

modernizr-2.6.2-respond-1.1.0.min.js

modernizr-2.6.2-respond-1.1.0.min.js

227 ms

jquery.min.js

jquery.min.js

34 ms

bootstrap.min.js

bootstrap.min.js

226 ms

plugins.js

plugins.js

168 ms

main.js

main.js

267 ms

conversion.js

conversion.js

96 ms

b082d490b1ce4d94a6f45dd76d180e80736ec6bc.js

b082d490b1ce4d94a6f45dd76d180e80736ec6bc.js

88 ms

css

css

33 ms

fbds.js

fbds.js

131 ms

SlVeZ-PpSWk

SlVeZ-PpSWk

226 ms

body_bgd_@2X.png

body_bgd_@2X.png

121 ms

jumpotron_bgd.jpg

jumpotron_bgd.jpg

180 ms

hdr-logo.png

hdr-logo.png

121 ms

monitor.png

monitor.png

559 ms

gray-dot.gif

gray-dot.gif

131 ms

customer.png

customer.png

557 ms

cream_pixels.gif

cream_pixels.gif

130 ms

makeuseof.png

makeuseof.png

130 ms

ftr-logo.png

ftr-logo.png

188 ms

icon_windows_18h.png

icon_windows_18h.png

189 ms

98 ms

ga.js

ga.js

82 ms

font

font

56 ms

font

font

153 ms

glyphicons-halflings-regular.woff

glyphicons-halflings-regular.woff

123 ms

modules-v2.js

modules-v2.js

53 ms

__utm.gif

__utm.gif

40 ms

58 ms

www-player.css

www-player.css

8 ms

www-embed-player.js

www-embed-player.js

30 ms

base.js

base.js

60 ms

ad_status.js

ad_status.js

160 ms

HRWvHAg5u1ehCJtdrky-PNA-CjIWhbU7xrlveGXuadw.js

HRWvHAg5u1ehCJtdrky-PNA-CjIWhbU7xrlveGXuadw.js

94 ms

embed.js

embed.js

42 ms

id

id

39 ms

Accessibility Review

pdfstacks.com accessibility score

71

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

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

Names and labels

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.

Impact

Issue

High

<frame> or <iframe> elements do not have a title

High

Form elements do not have associated labels

High

Links do not have a discernible name

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Best Practices

pdfstacks.com best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

pdfstacks.com SEO score

100

Search Engine Optimization Advices

Mobile Friendly

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/).

Impact

Issue

High

Document uses legible font sizes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Pdfstacks.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Pdfstacks.com 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

pdfstacks.com

Open Graph description is not detected on the main page of PDF Stacks. 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: