CSS Minifier
Compress CSS to reduce file size and speed up page loads.
How it works
Compress CSS by removing whitespace, comments and redundant values — smaller files mean faster page loads. Powered by CSSO, running in your browser.
Try an example
—🔒 Generated entirely in your browser — nothing is uploaded.
🔒 Runs in your browser: tags, sitemaps and minification are generated locally from what you type — nothing is uploaded, no signup, no limits.
About the CSS Minifier
This free CSS minifier compresses your stylesheets by removing whitespace, comments and redundant values — smaller CSS downloads faster and improves page load times. It's powered by CSSO and runs entirely in your browser.
Your CSS is never uploaded.
How to use it
- Paste your CSS.
- The minified result and the size saved appear instantly.
- Copy it into your production stylesheet or build output.
Frequently asked questions
How does CSS minification work?
It strips comments and whitespace and simplifies values — for example shortening colours and collapsing redundant zeros — without changing how the styles render.
Is the minified CSS safe to use?
Yes. CSSO produces output that renders identically to your source; only characters that don't affect the result are removed.
Should I keep my original CSS?
Yes — keep the readable source for editing and minify as part of your build or before deploying. Minified CSS is hard to edit by hand.
Is my CSS uploaded?
No. It's minified in your browser.