CSS Minifier & Beautifier
Compress or Format Your Stylesheets
Minify CSS for production or beautify for readability. Remove comments, whitespace, and optimize selectors. See compression stats and file size savings. 100% client-side. Zero data stored.
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Choose Mode
Process
CSS Minifier/Beautifier Tool
Input CSS
Output
Mode
Minify Options
Beautify Options
Compression Stats
Common Use Cases
Production Deployment
Minify CSS before deploying to production to reduce file size and improve page load times.
Debugging Minified CSS
Beautify minified third-party CSS to understand its structure and debug styling issues.
Performance Optimization
Reduce CSS file size to improve Core Web Vitals scores and meet performance budgets.
Team Standardization
Use beautify to standardize CSS formatting across your team with consistent indentation.
Bandwidth Savings
Smaller CSS files mean less bandwidth usage and faster downloads for your users.
Code Review
Beautify CSS before code review to make it easier to read and understand changes.
CSS Optimization Reference
Remove Comments
Strips all CSS comments (/* ... */) to reduce file size. Comments are for development only.
Remove Whitespace
Removes newlines, tabs, and extra spaces. Browsers don't need formatting to parse CSS.
Remove Last Semicolons
The last property in a rule doesn't need a semicolon. Saves bytes on large stylesheets.
Configurable Indent
Choose 2 spaces, 4 spaces, or tabs for beautified output. Match your team's coding standards.
Sort Properties
Alphabetically sort CSS properties within each rule for easier reading and maintenance.
Size Statistics
See before/after file sizes, bytes saved, and percentage reduction for your CSS.
Frequently Asked Questions
Why We Built This CSS Minifier
CSS file size directly impacts page load times and user experience. Every kilobyte of CSS must be downloaded, parsed, and applied before your page can render. For users on slow connections or mobile devices, large CSS files create noticeable delays that hurt engagement and conversion rates.
Many existing CSS minification tools require uploading your code to external servers, raising privacy concerns for proprietary stylesheets. Others require installing build tools or plugins that add complexity to your development workflow. We wanted something simpler and more private.
Our CSS Minifier runs entirely in your browser. Your stylesheets never leave your device - there's no server processing, no uploads, no tracking. This makes it safe for sensitive projects and works even offline once the page is loaded.
We also included beautification because debugging minified CSS is painful. When you encounter a production bug or need to understand third-party styles, having a one-click beautifier saves significant time.
CSS Minifier is part of RJL.io's collection of free developer tools. Check out our Pretty Print for JSON/XML formatting, Diff Checker for comparing code, and Hash Generator for integrity checking.