Free CSS Minifier

Minify CSS by removing whitespace and comments to shrink stylesheets.

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  • 🔒 Files never leave your device
  • ⚡ Converted in your browser
  • ✅ No account required

CSS Minifier: The Complete Guide

Compress your CSS into the smallest equivalent stylesheet — whitespace and comments are removed and rules are optimized — so your styles download faster.

How to use the CSS Minifier

  1. Paste or type your code, text, or data into the input box.
  2. Adjust options such as indent size, dialect, or flags when the tool offers them.
  3. The output updates instantly — copy it to your clipboard or download the file.

Features

  • Powered by the CSSO optimizer
  • Removes whitespace & comments
  • Safe structural optimizations
  • Copy or download the result

Why use this tool

  • Faster-loading stylesheets
  • Lower bandwidth in production
  • One-click, no build step needed

What does a CSS minifier do?

A CSS minifier strips everything a browser doesn't need — comments, spaces, and line breaks — and can safely shorten values, producing a smaller stylesheet that renders identically. This tool uses CSSO, a well-tested CSS optimizer, for reliable results.

Frequently Asked Questions

Does minifying change how my styles look?

No — the output is functionally identical CSS, just smaller. Only ignorable characters and redundancy are removed.

Can I beautify it back?

Yes — paste the minified CSS into the CSS Beautifier to restore readable formatting.

Is it free and private?

Yes — it's 100% free with no signup, and everything runs locally in your browser, so your data is never uploaded to a server.

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