UnCSS

Remove unused styles from CSS

Free • Open Source

Self-Hosted
CSS

What is UnCSS?

UnCSS is a tool that removes unused CSS from your stylesheets. It works across multiple files and supports Javascript-injected CSS.

How?

The process by which UnCSS removes the unused rules is as follows:

The HTML files are loaded by jsdom and JavaScript is executed.
All the stylesheets are parsed by PostCSS.
document.querySelector filters out selectors that are not found in the HTML files.
The remaining rules are converted back to CSS.

Please note:

• UnCSS cannot be run on non-HTML pages, such as templates or PHP files. If you need to run UnCSS against your templates, you should probably generate example HTML pages from your templates, and run uncss on those generated files; or run a live local dev server, and point uncss at that. • UnCSS only runs the Javascript that is run on page load. It does not (and cannot) handle Javascript that runs on user interactions like button clicks. You must use the ignore option to preserve classes that are added by Javascript on user interaction.

show full description ▾

Official Links

UnCSS Screenshots

Add a screenshot

No features, maybe you want to suggest one?

Suggest and vote on features

UnCSS information

Developed byGiacomo Martino
LicensingOpen Source (MIT) and Free product.
Written in
JavaScript
Alternatives5 alternatives listed

Supported Languages

English

GitHub repository

9,318 Stars
441 Forks
65 Open Issues
Updated

View on GitHub

Popular alternatives

View all

Our users have written 0 comments and reviews about UnCSS, and it has gotten 0 likes

UnCSS was added to AlternativeTo by POX on and this page was last updated .

Comments and Reviews Post a comment/review

all • positive • negative relevance • date

No comments or reviews, maybe you want to be first?

Recent user activities on UnCSS

POX added UnCSS as alternative(s) to uCSS
ago
POX added UnCSS as alternative(s) to Purgecss
ago
POX added UnCSS
ago