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CSS Optimizer

CSS Optimizer – Remove Unused CSS

by wooncherk · WordPress.org page · Website

v1.7 Tested up to WP 5.9.16 PHP 5.1+

CSS Optimizer has 100+ active installs on WordPress.org and 10,930 downloads all time. We have tracked it since September 4, 2026; download trends appear after 30 days of data. The last update was on March 16, 2022, tested up to WordPress 5.9.16.

CSS Optimizer at a glance

Active installs
100+
Total downloads
10,930
Downloads, last 30 days
–
available after 30 days of tracking
30-day growth
–
tracking since September 4, 2026

Is CSS Optimizer well maintained?

Support threads resolved
No open threads
nothing waiting on the WordPress.org forum
WordPress compatibility
Behind
tested up to WordPress 5.9.16, not yet with the current 7.1

CSS Optimizer reviews and ratings

6 reviews on WordPress.org, with the most recent ones as their authors posted them.

All reviews
3.7 out of 5

6 reviews

5★
4
4★
0
3★
0
2★
0
1★
2

  • Pest plugin

    The plugin simply catastrophically eats up space on the hosting.The site is 5.9 gigabytes. Of these, 3.9 gigabytes is occupied by the plugin cache in the wp-content folder.It's not an optimizer plugin, it's a pest plugin.

    Bahus

  • Broke my site

    After installing plugin, my site is completely broken, had to restore it with beckup.

    rvs2141

  • good to use

    Good to use

    jhui123

  • Nice to use

    User friendly. So easy to use

    yifan99

  • Easy to use.

    My website has a lot of unused CSS, by using this CSS optimizer. Mine CSS size decreased around 90%. Users-Friendly with a good design.

    huirulee14

  • Reduce Unused CSS works like a charm!

    This plugin has drastically helped my site! Before using the plugin, Google's PageSpeed Insights keeps flagging my site with "Reduce Unused CSS" and "Eliminate render-blocking resources". What more can you ask for a free plugin?

    phewlau

Details

Clean up and remove unused CSS from your website. Also generates Critical CSS to improve PageSpeed Score.

The full description, screenshots and every review live on the WordPress.org page.

Tags

  • autoptimize
  • Critical CSS
  • css
  • speed
Version
1.7
Last updated
Mar 16, 2022
First published
Nov 4, 2021
Requires WordPress
4.7
Tested up to
5.9.16
Requires PHP
5.1
Pricing
Free on WordPress.org

CSS Optimizer FAQ

How many active installs does CSS Optimizer have?

WordPress.org reports 100+ active installs for CSS Optimizer as of September 7, 2026.

Is CSS Optimizer still maintained?

The last release was on March 16, 2022, more than a year ago. WordPress.org shows a warning on plugins that go this long without an update.

Is CSS Optimizer free?

CSS Optimizer is free to install from WordPress.org. Many plugins also sell a paid version or add-ons.