Free CSS Minifier Online
Paste your CSS below to instantly remove all unnecessary whitespace, comments and redundant code. See exact before/after file size and the percentage reduction.
About the CSS Minifier
CSS minification reduces file size by removing all characters that are not required for the CSS to function — whitespace, newlines, tabs, comments, and in some cases redundant semicolons before closing braces. Smaller CSS files load faster, improving Core Web Vitals scores like LCP.
This browser-based minifier processes your CSS entirely client-side using regex and string manipulation. No data is uploaded, making it safe for production stylesheets.
How to Minify CSS
Paste Your CSS
Copy your formatted CSS file content and paste it into the left input area.
Minify
Click "Minify CSS". The right pane shows the compressed output.
Check Stats
See original size, minified size, and percentage reduction in the stats bar.
Copy & Use
Copy the minified CSS and paste it into your production stylesheet or build pipeline.
Frequently Asked Questions
No. The minifier only removes whitespace and comments. It does not change selectors, property values, or rule ordering. The resulting CSS is functionally identical to the original.
Typical CSS files see 20–40% size reduction from whitespace and comment removal. Combined with gzip/brotli compression on your web server, the total bandwidth savings can exceed 80%.
Yes. Use the CSS Formatter to beautify minified CSS back to a readable form.
No. Keep formatted CSS in development for readability and debugging. Minify only for production deployments. Most build tools (Webpack, Vite, Parcel) automate this step.