Free Online CSS Minifier

CSS minification strips comments and unnecessary whitespace from stylesheets to shrink the file size shipped to browsers in production.

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How to Use This Developer Tool

  1. Paste your CSS into the input area.
  2. Read the minified output below.
  3. Check the size reduction shown beneath the output.
  4. Click Copy to send the result to your clipboard.

What Is a CSS Minifier?

Every byte the browser downloads before the first paint costs page-load time. A well-commented CSS file routinely shrinks by 30–50% when comments and whitespace are removed, then by another factor of 4–8 once gzip or brotli compresses the result. The two passes are independent: you want both.

The minifier removes block comments (`/* … */`), collapses runs of whitespace, drops whitespace around braces and colons, and removes the optional trailing semicolon before a closing brace. The output is functionally identical to the input — only the byte count changes — so it's safe to drop into a build pipeline as a final step after authoring.

Frequently Asked Questions

Why minify CSS?
Minified CSS loads faster. Removing whitespace, comments, and shortening values reduces file size, improving page load times.
Does minification break CSS?
No, proper minification preserves all functionality. Only unnecessary characters are removed. The CSS behaves identically.
How much smaller does CSS get?
Typically 20-50% reduction depending on original formatting. Well-commented CSS sees larger savings. Gzip adds further reduction on top.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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