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CSS Minifier

Note: This minifier uses aggressive optimization to reduce file size. Always test minified CSS thoroughly before deploying to production. Minification removes whitespace, comments, and optimizes syntax without changing functionality.

About CSS Minifier

CSS minification reduces file size by removing unnecessary characters like whitespace, comments, and optimizing color codes and units. This improves page load times and reduces bandwidth usage. The minifier removes comments, collapses whitespace, compresses color codes (#ffffff to #fff), removes leading zeros (0.5 to .5), and compresses zero units (0px to 0). All minification happens in your browser for complete privacy.

How to Use

  1. Paste or type your CSS into the input field.
  2. The tool will automatically minify your CSS after a brief pause.
  3. Click "Minify" to manually trigger minification.
  4. View the size reduction statistics showing original size, minified size, and savings.
  5. Click "Copy" to copy the minified CSS to your clipboard.
  6. Use the minified CSS in your production website.

Frequently Asked Questions

What is CSS minification?

CSS minification is the process of removing unnecessary characters (whitespace, comments, line breaks) and optimizing code (compressing colors, removing units from zeros) without changing functionality. This reduces file size, leading to faster download times and improved page load performance.

What optimizations does the minifier perform?

The minifier removes comments and whitespace, eliminates unnecessary semicolons, compresses 6-digit color codes to 3-digit (#ffffff → #fff), removes leading zeros (.5 instead of 0.5), and compresses zero values (0px → 0). These optimizations significantly reduce file size.

Will minification break my CSS?

No, minification only removes unnecessary characters and optimizes syntax without changing how browsers interpret the CSS. However, always test your minified CSS to ensure it works as expected, especially if your CSS contains unusual syntax or relies on specific formatting.

How much size reduction can I expect?

Size reduction varies based on your CSS style. Well-formatted CSS with comments and whitespace typically sees 20-40% reduction. Already compact CSS will see less reduction. The statistics panel shows exact savings for your specific CSS.

Should I minify CSS for production?

Yes! Minifying CSS is a best practice for production websites. It reduces bandwidth usage, improves page load times, and enhances user experience. Keep unminified versions for development. Most build tools (webpack, Vite, etc.) can automate this process.

Can I use this for CSS preprocessor output (Sass, Less)?

Yes! After compiling Sass or Less to CSS, you can minify the output. However, this tool works with standard CSS syntax only—it won't process Sass or Less syntax directly.

Is my data secure?

Yes! All CSS processing happens entirely in your browser using JavaScript. Your CSS is never sent to any server, ensuring complete privacy. The tool works offline once loaded.

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