Is CSS Optimizer free?

Yes, CSS Optimizer is free to use. It is available as a free plugin on WordPress.org.

How many websites use CSS Optimizer?

CSS Optimizer has 100 active installations as tracked by WordPress.org.

What are the best CSS Optimizer alternatives?

Popular alternatives to CSS Optimizer include WPCode – Insert Headers and Footers +…, Code Snippets, Simple Custom CSS Plugin. You can compare them side-by-side on our comparison pages.

Does CSS Optimizer work with the latest WordPress?

CSS Optimizer has been tested up to WordPress 5.9.13. It requires WordPress 4.7+ and PHP 5.1+.

PluginSift

CSS Optimizer – Remove Unused CSS

Name: CSS Optimizer – Remove Unused CSS
Rating: 3.7 (6 reviews)
Author: wooncherk

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

By wooncherk·CSS·Free

3.7(6 reviews)

·100 active installs·Updated 4 years ago

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As of April 2026, CSS Optimizer is a WordPress css plugin with 100 active installations and a 3.7/5 rating from 6 reviews. It has been downloaded 10K+ times in total. Requires WordPress 4.7+ and PHP 5.1+. Available on WordPress.org since 2021. Last updated 4 years ago — may have compatibility concerns. Top alternative: WPCode – Insert Headers and Footers +….

3.7/56 reviews

100active installs

10K+total downloads

5 yearssince 2021

Overview

“Remove Unused CSS” is frequently flagged in Google’s PageSpeed Insights. Indeed, most scenario, around 70% – 80% of a page’s CSS codes are redundant, and can be removed without affecting the overall visual. This happens mainly because WordPress themes and plugins are created as generic solutions that includes a bunch of features that may or may not be used on a particular page.

Example: A theme may come with a bunch of features such as slider, carousel, animation and etc, but your home page may use only the slider feature and your about page may use only the carousel feature. However, for practical reason, it’s virtually impossible to selectively include only the required CSS rules for the features that were enabled on a particular page.

This is where…

Read full description on WordPress.org