CSS Minifier

Minify CSS by removing comments, collapsing whitespace and dropping redundant semicolons — with a size-savings report. Runs in your browser.

Runs in your browser — your file never leaves your device

Frequently asked questions

Is CSS Minifier free to use?

Yes — CSS Minifier is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.

Are my files uploaded or stored anywhere?

No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.

Do I need to install anything or create an account?

No installation and no account needed. CSS Minifier works on any modern browser — Windows, Mac, Linux, Android and iPhone.

How do I use CSS Minifier?

Open the tool, add your file (or paste your content), adjust any options, then press “Minify CSS”. Your result is ready to download in seconds.

.pdf ↔ application/pdf, both ways.

Sort object keys alphabetically, deep.

Split names into fair random teams.

Validate test card numbers (for devs).

ms, s, min, hours, days, years.

Indicative estimate of AI-written text (not proof).