Free CSS Minifier Online — Compress & Optimize Stylesheets

Remove /* comments */ Remove extra whitespace Optimize zero values (0px → 0) Remove last semicolons in blocks Remove empty rules

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About This Tool

The free CSS minifier compresses stylesheets by removing whitespace, newlines, comments, and redundant semicolons. This reduces CSS file size, directly improving page load performance and Core Web Vitals scores. Exact byte savings and percentage reduction are shown after each minification.

Common Use Cases

Optimizing stylesheets for production
Reducing CSS bundle size
Improving Google PageSpeed scores
Pre-processing CSS before deployment
Compressing third-party stylesheets

Frequently Asked Questions

Is minified CSS functionally identical to the original?

Yes. Minified CSS removes only whitespace, comments, and redundant characters — the browser renders it identically.

How much does CSS minification reduce file size?

Typically 20-40%. Heavily commented stylesheets can see 50%+ reduction.

Should I also use GZIP with minified CSS?

Yes. Combine CSS minification with server-side gzip or Brotli compression for maximum size reduction.