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CSS Minifier

Minify CSS with CSSO, which does more than strip spaces: #ffffff becomes #fff, redundant zeros and units go, and duplicate rules can be merged.

Free

Paste or type to begin. Everything runs in your browser.

How it works

How to use the CSS Minifier

  1. 01

    Paste CSS, drop a .css file onto the input, or load the sample.

  2. 02

    Turn on restructuring if you want duplicate selectors and declarations merged. Keep /*! … */ license comments if you need them.

  3. 03

    Check the saving under the editor, then copy or download the result.

Good to know

  • Restructuring gives the biggest saving. Test the result if your styles depend on rule order.
  • Expect 15–40% off before gzip. Keep gzip or Brotli on your server too; the two stack.

FAQ

Frequently asked questions

Why is my file barely smaller?

It was probably minified already, or has few comments and short values. Restructuring may still find duplicate rules to merge.

Can I get the original back?

Not exactly, because comments are gone. The CSS Beautifier will make it readable again.

Keep going

All developer tools

  • CSS Beautifier

    Unminify CSS: one declaration per line, with @media blocks indented properly.

    Developer

  • JS Beautifier

    Make minified JavaScript readable again, with your indent and brace style.

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