Free CSS Minifier

Reduce CSS file size by removing comments and collapsing whitespace, while keeping the spaces that matter (like inside calc() and complex selectors) so your styles still work. Paste, minify and copy — locally in your browser.

100% free
Private & safe
Runs in your browser

This tool runs entirely in your browser and needs JavaScript enabled to work. The full guide, examples and FAQ below are available without it.

CSS

Minified CSS

Why use CSS Minifier?

CSS Minifier is a quick, no-nonsense developer utility that runs entirely client-side, so your code and data never leave your machine.

Runs instantly in your browser — nothing to install, nothing uploaded.
Completely free, with no account, no watermarks and no usage limits.
Input/Output: CSS
Paste your CSS.
Works on any device — desktop, tablet and phone — and is fully keyboard accessible.

How to use CSS Minifier

Paste your CSS.
Click Minify.
Comments and extra whitespace are removed.
Copy or download the minified CSS.

Examples

Shrinking a stylesheet before deploy.
Inlining critical CSS.

Supported formats & limits

Input/Output: CSS

Limitations

Does not merge or reorder rules, or rename selectors.

Frequently asked questions

Will it break calc() or selectors?

No — it keeps the spaces required around +, >, ~ and inside calc().

Uploaded?

No — it runs in your browser.

Does it change my colours or units?

No — values are left as-is; only whitespace and comments are removed.

Was this tool helpful?

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