CSS Minifier & Beautifier
Compress CSS for production or pretty-print minified CSS for debugging. 100% client-side — your CSS never leaves your browser.
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🔒 100% private: All processing happens in your browser. Your CSS never leaves your device.
About CSS Minifier & Beautifier
CSS (Cascading Style Sheets) files can become large and full of whitespace, comments, and formatting that browsers do not need to render the page. Minifying CSS removes all unnecessary characters, often reducing file size by 20–40% — a significant win for page load speed and Core Web Vitals. On the flip side, minified CSS is nearly impossible to read, so developers often need to beautify (pretty-print) it back when debugging third-party stylesheets. This tool does both: it minifies CSS for production and beautifies minified CSS back into readable, indented code — all in your browser, no data sent to any server.
How It Works
- Paste your CSS into the input box.
- Click "Minify CSS" to compress it, or "Beautify CSS" to pretty-print it.
- See the output size and savings percentage immediately.
- Copy the result or download it as a .css file.
✨ Key Features
- ✓Minify CSS — removes whitespace, comments, and unnecessary characters
- ✓Beautify CSS — reformats minified CSS with proper indentation
- ✓Live character count and file size savings
- ✓Preserves strings, URLs, and important comments
- ✓Handles @media, @keyframes, @import, @font-face
- ✓Optional line breaks in minified output for readability
- ✓Copy to clipboard with one click
- ✓Download as .css file
- ✓Instant processing — no server round-trip
- ✓100% client-side — no data sent to any server
🎯 Common Use Cases
- →Optimizing CSS for production to reduce page load time
- →Debugging third-party minified stylesheets
- →Comparing minified vs original CSS size
- →Preparing CSS for embedding in HTML <style> tags
- →Preparing CSS for email templates
- →Learning CSS structure by beautifying obfuscated files
- →Cleaning up exported CSS from design tools
- →Preparing CSS for CDN delivery
💡 Advanced Tips & Pro Insights
- ▸Minification typically saves 20–40% on CSS. For further savings, use gzip or Brotli compression at the server level (adds another 70–85% reduction).
- ▸Always keep the unminified source (source of truth) in version control. Minified CSS is a build artifact, not source code.
- ▸For best results, combine CSS files before minifying — fewer HTTP requests improves performance more than per-file minification.
- ▸Modern build tools (Webpack, Vite, esbuild, PostCSS) include CSS minification automatically. This tool is best for one-off cases or debugging.
- ▸CSS variables (--var-name) are preserved by this tool — they are runtime values that must not be minified.
Frequently Asked Questions
Is this CSS minifier free?▾
Yes, this CSS minifier and beautifier is completely free with no signup, email, or usage limits.
Is my data safe?▾
Yes, 100% safe. All processing happens in your browser. Your CSS is never uploaded to any server.
How much does minification reduce file size?▾
Typical savings are 20–40% for hand-written CSS with comments. Larger, more verbose files (with lots of whitespace) save more; already-compact CSS saves less.
Does minification break my CSS?▾
No. Minification only removes whitespace, comments, and unnecessary characters — it preserves all rules, selectors, and values. This tool also preserves strings, URLs, and important comments (/*! ... */).
What is the difference between minify and beautify?▾
Minify compresses CSS (removes whitespace) to reduce file size for production. Beautify expands CSS (adds indentation and line breaks) to make it human-readable for editing and debugging.
Are comments removed?▾
Yes, regular comments are removed. But "important comments" starting with /*! are preserved (common in licenses). You can keep all comments by not using Minify.
Should I minify CSS before or after gzip?▾
Minify first, then gzip. They are complementary: minification removes redundant characters (20–40% smaller), then gzip compresses the remaining bytes (70–85% smaller again). Together they typically reduce CSS by 85–90%.
Does it handle modern CSS features?▾
Yes — @media, @supports, @keyframes, @font-face, CSS variables (--var), calc(), clamp(), and all modern syntax are preserved correctly.