What this tool does
This CSS Minifier compresses your CSS code by stripping out everything the browser does not need to read: comments, extra whitespace, newlines, and redundant characters. The result is a smaller file that loads faster on your website.
Paste any CSS stylesheet and get production-ready minified output in one click, along with a before-and-after size comparison showing exactly how many bytes you saved.
How minification works
CSS minification applies several transformations to reduce file size without changing how the browser interprets the styles:
- **Comment removal** — Block comments (\`/* ... */\`) are stripped entirely - **Whitespace collapse** — Spaces, tabs, and newlines are removed or collapsed - **Punctuation tightening** — Spaces around \`{\`, \
Who should use this
- **Web developers** preparing stylesheets for production deployment - **Front-end engineers** optimizing page load performance - **Designers** who hand-write CSS and want a quick way to compress it - **Students** learning about web performance and build tooling - **Anyone** pasting CSS into an email template, CMS, or inline style block where size matters
How to use
1. Paste your CSS code into the input area 2. Click the **Minify** button 3. Review the minified output and size statistics 4. Click **Copy** to copy the minified CSS to your clipboard 5. Use the **Clear** button to start over with new CSS
Example
**Before (readable CSS):** \`\`\`css /* Main layout */ body { margin: 0px; padding: 0px; font-family: Arial, sans-serif; }
.container { max-width: 1200px; margin: 0 auto; } \`\`\`
**After (minified CSS):** \`\`\`css body{margin:0;padding:0;font-family:Arial,sans-serif}.container{max-width:1200px;margin:0 auto} \`\`\`
In this example, the file size drops from around 160 bytes to about 95 bytes, a savings of roughly 40%.
FAQs
**Q: Does minification break my CSS?** A: No. Minification only removes characters that are not needed for the browser to interpret your styles correctly. The visual output is identical.
**Q: Is my CSS sent to a server?** A: No. All processing happens locally in your browser. Nothing is uploaded or stored.
**Q: Should I minify CSS before or after using a preprocessor like Sass?** A: After. Compile your Sass or Less to regular CSS first, then minify the compiled output.
**Q: How does this compare to tools like cssnano or clean-css?** A: Build-tool minifiers like cssnano can apply more advanced optimizations such as merging duplicate selectors and shorthand property collapsing. This tool covers the most common and impactful optimizations for quick, one-off minification without a build pipeline.
**Q: Can I use the minified output in production?** A: Yes. The output is valid CSS that is ready for production use.
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