ShortPixel

With ShortPixel Critical CSS plugin, your website can automatically generate above-the-fold CSS for your web pages. 
This means your website will load faster and get better scores with online testing tools like PageSpeed Insights or GTmetrix.
IMPORTANT NOTICE: Plugin closure! 
We would like to inform you that the ShortPixel Critical CSS plugin and criticalcss.co service will be closed starting December 1st, 2024, and will no longer be available.
The Critical CSS functionality has now been integrated into the <a href="https://wordpress.org/plugins/fastpixel-website-accelerator/" rel="ugc">FastPixel Caching plugin</a>, and we highly recommend transitioning to this new plugin as soon as possible to ensure continued functionality and support.
If you have any questions, please feel free to contact us at <a href="mailto:help@shortpixel.com" rel="nofollow ugc">help@shortpixel.com</a>.
How it works?
<ul>
<li>ShortPixel’s Critical CSS (CCSS) plugin uses our brand new service to generate the critical CSS for your website’s pages.</li>
<li>The generated CCSS is inserted into the web pages while the original .css files are deferred. This makes the pages load faster.</li>
<li>The plugin starts generating the CCSS for each visited page and retrieves it from the ShortPixel Critical CSS Service. This is done using WP CRON jobs that run in the background without user intervention and without slowing down the website.</li>
<li>The edited pages will have the CCSS automatically generated.</li>
</ul>
Features
<ul>
<li>The CCSS plugin can be configured to keep Critical CSS rules based on the page URL or for each page template. This can help optimize the number of CCSS files needed.</li>
<li>Additional flexibility: the website administrator can manually configure additional Critical CSS rules to be included in the generated Critical CSS.</li>
<li>Our plugin integrates with WP Rocket and Elementor, if they are present, in order to leverage the cache support and deliver Critical CSS more effectively.</li>
</ul>
The plugin was forked from the <a href="https://wordpress.org/plugins/wp-criticalcss/" rel="ugc"> WP Critical CSS</a> plugin, modified to use ShortPixel’s Critical CSS service and enhanced with new features.
Currently, the plugin while in its BETA version, is 100% free to use. Just install it on your website, configure it and test the results with a tool like <a href="https://pagespeed.web.dev/" rel="nofollow ugc">Google PageSpeed Insights</a> or <a href="https://gtmetrix.com/" rel="nofollow ugc">GTMetrix</a>
For questions or support, please contact us directly <a href="https://shortpixel.com/contact" rel="nofollow ugc">here</a>
Other plugins by ShortPixel
<ul>
<li><a href="https://wordpress.org/plugins/fastpixel-website-accelerator/" rel="ugc">FastPixel Caching</a> – WP Optimization made easy</li>
<li><a href="https://wordpress.org/plugins/shortpixel-image-optimiser/" rel="ugc">ShortPixel Image Optimizer</a> – Image optimization & compression for all the images on your website, including WebP & AVIF delivery</li>
<li><a href="https://wordpress.org/plugins/shortpixel-adaptive-images/" rel="ugc">ShortPixel Adaptive Images</a> – On-the-fly image optimization & CDN delivery</li>
<li><a href="https://wordpress.org/plugins/enable-media-replace/" rel="ugc">Enable Media Replace</a> – Easily replace images or files in Media Library</li>
<li><a href="https://wordpress.org/plugins/regenerate-thumbnails-advanced/" rel="ugc">reGenerate Thumbnails Advanced</a> – Easily regenerate thumbnails</li>
<li><a href="https://wordpress.org/plugins/resize-image-after-upload/" rel="ugc">Resize Image After Upload</a> – Automatically resize each uploaded image</li>
<li><a href="https://wordpress.org/plugins/wp-svg-images/" rel="ugc">WP SVG Images</a> – Secure upload of SVG files to Media Library</li>
</ul>

ShortPixel Critical CSS

Easy to use and simple. Does what it says.

Working great!

Critical CSS plugin by ShortPixel to speed up your website. Easy to use, works on any website.

Frank Goossens

Deny Dias

This plugin extends Autoptimize to automatically create critical CSS rules. These rules inject the correct critical CSS in different types of pages to ensure these pages are rendered even before the full CSS is loaded, improving the “start to render time” and user experience. For this purpose the plugin integrates with criticalcss.com, a 3rd party service, to have it generate the critical CSS (see <a href="https://wordpress.org/plugins/autoptimize-criticalcss/#faq">FAQ for info on pricing</a>).
Simply install and activate the plugin (you will need to have Autoptimize up and running), enter your <a href="https://criticalcss.com/?aff=1" rel="nofollow ugc">https://criticalcss.com</a> API key and the plugin will automatically start work to create rules.
If you want to change settings or review the rules, you can find these by clicking the “critical css” tab on the Autoptimize plugin settings screen. There are “installation instructions” and more info in <a href="https://wordpress.org/plugins/autoptimize-criticalcss/#faq">the FAQ</a>.

Autoptimize criticalcss.com power-up

Its configuration definitely has a learning curve, but when you get the hang of it, this plugin becomes essential to your website!

Close to perfect

Autoptimize criticalcss.com power-up adds automated critical css creation to Autoptimize integrating with the https://criticalcss.com service.

ShortPixel Critical CSS vs Autoptimize criticalcss.com power-up