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CSS Minifier & Beautifier

Minify or beautify CSS code instantly in your browser — free online CSS compressor and formatter.

Free CSS Minifier & Beautifier

Paste any CSS code into the field above and click Beautify to get nicely indented, readable output. Use Minify to strip all unnecessary whitespace, comments, and line breaks for production-ready stylesheets. This free online CSS minifier works entirely in your browser — no data is sent to any server.

What Is CSS Minification?

CSS minification is the process of removing unnecessary characters from a stylesheet — including whitespace, line breaks, comments, and redundant semicolons — without changing how the styles are applied. The result is a smaller file that downloads faster, improving page load speed and reducing bandwidth usage. Minified CSS is a standard practice for production websites and is recommended by performance tools like Google PageSpeed Insights and Lighthouse.

What Does CSS Beautification Do?

CSS beautification (also called CSS formatting or pretty-printing) does the opposite: it takes compact or minified CSS and adds consistent indentation, line breaks, and spacing to make it human-readable. This is essential when debugging third-party libraries, reviewing styles from external sources, or auditing a codebase.

How to Use This CSS Minifier

  1. Paste your CSS code into the input field — minified, beautified, or anything in between.
  2. Click Beautify for readable, indented output, or Minify for compact production code.
  3. Copy the result with the copy button and use it in your project.

Common Uses

  • Minifying stylesheets before deploying to production to improve page load speed
  • Beautifying minified CSS from CDNs and third-party libraries for debugging
  • Removing inline comments from shared or open-source stylesheets
  • Reducing CSS payload size for better Core Web Vitals and Lighthouse scores
  • Formatting CSS copied from browser DevTools for documentation

Frequently Asked Questions

What's the difference between minifying and beautifying CSS?
Minifying removes all unnecessary whitespace, comments, and often combines redundant rules to create the smallest possible CSS file for production. Beautifying reformats CSS with proper indentation, line breaks, and consistent spacing to make it readable for editing or debugging.
Why should I minify CSS?
Minified CSS files are smaller and load faster, improving page speed and user experience. Smaller files also reduce bandwidth costs and are especially beneficial for mobile users. Search engines also consider page speed as a ranking factor.
What does CSS minification remove?
Minification typically removes: comments, unnecessary whitespace (spaces, tabs, line breaks), and the last semicolon in a rule block. Advanced minifiers may also combine duplicate rules, shorten color values (e.g., #ffffff to #fff), and remove unused styles.
Can I still edit minified CSS?
Technically yes, but it's very difficult. Minified CSS is typically one long line with no spacing or organization. Always keep a non-minified source version for editing, and regenerate the minified version when you make changes. Use this tool to beautify minified CSS if you need to inspect it.
Does minification affect CSS specificity?
No. Minification doesn't change the actual CSS rules, selectors, or properties — it only removes formatting. The cascade, specificity, and computed styles remain identical between minified and unminified versions.
Is this tool secure?
Yes. All processing happens entirely in your browser. Your CSS code is never sent to any server. For proprietary styles or design systems, this local processing ensures your code stays private.

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