Free Online CSS Minifier & Beautifier

Minify CSS to reduce file size and improve page load speed, or beautify compressed CSS for readability. Supports Level 1 and Level 2 optimization using clean-css.

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Mode

Level

CSS Input

Output

Frequently Asked Questions

What does CSS minification do?

CSS minification removes comments, whitespace, newlines, and redundant semicolons without changing the visual output. It reduces file size and improves page load speed.

Is minified CSS valid?

Yes. Minified CSS is fully valid and parsed identically by browsers. All whitespace outside of string values is optional in CSS.

How much can CSS be compressed?

Well-formatted CSS with comments and indentation can be reduced by 30–50%. Heavily commented files see even greater compression. For large frameworks like Bootstrap, savings can be significant.