CSS Minifier — Minify CSS Online Free
Paste your CSS and minify it instantly. Remove comments, collapse whitespace, and reduce file size.
How to css minifier
- 1Paste or type your CSS code into the input textarea
- 2Click the Minify button to process the code
- 3Review the minified output and the size comparison
- 4Click Copy to copy the minified CSS to your clipboard
About This Tool
CSS minification reduces file size by removing characters that browsers do not need to parse a stylesheet correctly. This includes comments, extra whitespace, trailing semicolons before closing braces, and redundant spaces around selectors and property values. Smaller CSS files mean faster downloads and quicker page rendering.
Build tools like PostCSS, cssnano, and Lightning CSS handle minification automatically in production pipelines. This online CSS minifier is handy when you need a quick one-off minification without setting up a build tool, or when you want to check how much size minification would save on a particular stylesheet.
All processing runs in your browser. Your CSS is never uploaded to any server, making it safe to use with proprietary stylesheets and client code.
Frequently Asked Questions
No. The tool only removes characters that have no effect on how browsers interpret the stylesheet: comments, extra whitespace, and trailing semicolons. Selectors and property values are not altered.
Yes. The minification is purely character-level (removing whitespace and comments), so it works with any CSS syntax including custom properties, nesting, container queries, and @layer rules.
Typical savings range from 15% to 40%, depending on the amount of whitespace and comments in your source CSS. Heavily documented stylesheets will see the largest reductions.
No. All minification happens locally in your browser. Your code never leaves your machine.