CSS Minifier
Minify CSS to shrink stylesheet size.
Paste CSS and get a minified, optimized stylesheet using the csso engine — comments and whitespace removed and rules compacted. See how many bytes you save. It all runs in your browser.
Runs entirely in your browser — nothing is uploaded.
How to use the css minifier
- 1Paste your CSS.
- 2See the minified output and size saved.
- 3Copy or download the result.
Frequently asked questions
Is my CSS uploaded?
No — minification runs entirely in your browser with the csso library; your code never leaves your device.
Is the output safe to use?
Yes — csso is a well-established optimizer that preserves your styles while compacting the output.
Read the guide
How to Minify CSS, JavaScript, and HTML (Free)