Delete unused CSS

A website needs to be fast so that you don’t miss out on visitors and get lower search engine rankings. Removing unused CSS is one of the possible pieces of advice for this. What is Removing Unused CSS? We explain it to you and give the the solution to fix this problem.

What is Removing Unused CSS?

Removing unused CSS is a recommendation you may get when performing a check of your website. It is tip that indicates that it is smart to remove unused CSS in order to make a website faster.(1)

The problem with unused CSS

CSS provides the styling to a Web page. When a browser scans a Web site, it passes every line of CSS. The browser looks to see if it should apply the code to the web page. If there are lines of code that are not in use, the browser checks them for nothing and this takes a lot of extra time.

Although a browser is very fast and you don’t always notice it, unused CSS definitely affects page loading speed. In the long run, this in turn affects usability and ultimately a page’s search engine results.

The impact of Removing Unused CSS on SEO

Removing unused CSS may have good impact on the SEO of a web page. You remove unused code, making the browser load your website even faster. This may be a matter of milliseconds, but it does make a difference to both visitors and the search engine. Although Removing Unused CSS is not the only way to speed up the website, it is certainly a step in the right direction.

My advice

Removing unused CSS is a good way to make the website a little faster. But how do you do this? We recommend using the Google PageSpeeds Insights program. This program scans your website for numerous issues and then provides the analysis. Removing unused CSS may be one of the recommendations you get. The advantage of PageSpeed Insights is that it also immediately tells you what to do to fix it.

The most complete book on website speed

I’ve written so much about speeding up websites and everything involved that I like to divide it into different sections; general, tools, speed improvement points and tips. Feel free to see and consult all the links below to learn more about tools and tips for speeding up your website.



Verbter points for speed

General tips


  1. Remove unused CSS. (2019, May 2). Chrome For Developers.

Frequently Asked Questions

What does What does “delete unused css” mean?

If you do a check of your website then unused css removal can get you a recommendation. You can remove unused css with this tip. It makes your website work faster. Unused css affects page loading speed. It affects usability.

What is the impact of Unused Css Removal on SEO?

The impact on SEO of removing a web page with unused css is good. Your browser will load faster when you remove unused code. It makes a difference to visitors and also the search engine. Speeding up websites can be done in several ways, and removing unused css is a good start.

Senior SEO-specialist

Ralf van Veen

Senior SEO-specialist
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I have been working for 10 years as an independent SEO specialist for companies (in the Netherlands and abroad) that want to rank higher in Google in a sustainable manner. During this period I have consulted A-brands, set up large-scale international SEO campaigns and coached global development teams in the field of search engine optimization.

With this broad experience within SEO, I have developed the SEO course and helped hundreds of companies with improved findability in Google in a sustainable and transparent way. For this you can consult my portfolio, references and collaborations.

This article was originally published on 26 April 2024. The last update of this article was on 26 April 2024. The content of this page was written and approved by Ralf van Veen. Learn more about the creation of my articles in my editorial guidelines.

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