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CSS Minifier online

Minify CSS to reduce file size, or beautify CSS for editing

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by
CHUNKY
MUNSTER
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How to Use This CSS Compressor

  1. Paste your CSS code into the input area.
  2. Click Minify to strip whitespace, comments, and redundant characters.
  3. Switch to Beautify mode to format and indent compressed CSS for editing.
  4. Copy the output or download it as a .css file.

CSS Minifier optimizes your stylesheets by removing unnecessary characters like whitespace, comments, and redundant semicolons without altering the visual output. This stylesheet optimizer is essential for production deployments, as it reduces the final file size of your CSS, leading to faster page loads and improved site performance across all devices.

Optimize CSS Production with Ease

Minification strips all whitespace not required by CSS syntax, shortens zero units, and removes unnecessary quotes around property values. This CSS formatter also includes a beautify mode, which reformats minified code into a human-readable structure for easier debugging. By using this tool, you ensure your site's code remains efficient while keeping the flexibility to switch back to a readable version when needed.

Frequently Asked Questions

Does CSS minification change how styles are applied?

No - minification only removes characters that the CSS parser ignores anyway. The resulting stylesheet is semantically identical and produces exactly the same visual rendering.

Should I minify in development or only in production?

Minify only for production. Minified CSS is hard to debug because source-mapped line numbers are collapsed. Most build tools (Webpack, Vite, Parcel) minify CSS automatically during production builds.

What about CSS source maps?

Production CSS should be accompanied by a .css.map file linking minified positions back to original source locations. Browser DevTools use the source map to show the original, readable CSS during debugging even though the browser parses the minified version.

How much smaller is minified CSS compared to the original?

Typically 20–35% smaller before server compression. With gzip or Brotli compression (which nearly all servers apply), CSS compresses extremely well - the difference between minified and non-minified becomes much smaller after server compression.

See also the CSS Prettifier and HTML Formatter to maintain your project's code quality before using this CSS Minifier.

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