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CSS Minifier & Beautifier

Minify CSS to reduce file size or beautify compressed CSS for readability. Free, client-side, no signup required.

Your data never leaves your browser Available via MCP
Next steps
JS Minifier → HTML Beautifier → Color Picker →

How to Use

  1. Paste your CSS into the input panel.
  2. Click Beautify to format with indentation, or Minify to compress.
  3. Select your preferred indentation (2 or 4 spaces).
  4. Click Copy to copy the result.

Why Minify CSS?

Every kilobyte matters for web performance. CSS files are render-blocking — the browser cannot display the page until all CSS is downloaded and parsed. Minifying CSS removes comments, whitespace, and redundant semicolons, typically reducing file size by 20-60%. For a 100KB stylesheet, that's 20-60KB saved on every page load.

CSS Minification Techniques

  • Whitespace removal — Removes spaces, tabs, and line breaks between rules
  • Comment stripping — Removes all CSS comments (/* ... */)
  • Semicolon optimization — Removes the last semicolon before closing braces
  • Zero optimization — Converts 0px, 0em to just 0 where safe

When to Beautify CSS

Use the beautifier when working with minified third-party CSS, debugging production stylesheets, or reformatting inconsistently formatted code. Readable CSS with consistent indentation makes it dramatically easier to find specific rules, understand cascade order, and review changes in pull requests.

Related Tools

Minify JavaScript with the JavaScript Minifier. Format HTML with the HTML Beautifier. Compare CSS changes with the Diff Checker. Pick colors for your stylesheets with the Color Picker. Format JSON config files with the JSON Formatter. Encode CSS content for URLs with the URL Encoder.

Frequently Asked Questions

What does CSS minification do?
CSS minification removes whitespace, comments, and unnecessary characters from your stylesheets without changing functionality. This reduces file size by 20-60%, resulting in faster page loads.
Will minification break my CSS?
No. Minification only removes formatting — it does not change selectors, properties, or values. The minified CSS is functionally identical to the original.
What does the beautifier do?
The beautifier formats compressed or poorly formatted CSS into a readable structure with consistent indentation, one property per line, and proper spacing around selectors and braces.
Is my data safe?
Yes. All processing happens entirely in your browser. No CSS is sent to any server.

Code Examples

Learn how to use this tool programmatically in your favorite language.

Minify CSS

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Use this tool from AI agents. The CodeTidy MCP Server lets Claude, Cursor, and other AI agents use this tool and 46 others directly. One command: npx @codetidy/mcp

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