CSS Formatter & Minifier - Beautify CSS
Format and minify CSS code online. Beautify with custom indentation, or compress to reduce file size. All processing happens locally in your browser.
About This Tool
Our CSS Formatter & Minifier is a free online tool that helps you beautify or compress your CSS code instantly. Whether you need to format messy, unreadable CSS into clean, well-indented code, or compress your stylesheet to reduce its file size for production, this tool has you covered.
Formatting (Beautify) adds consistent indentation, line breaks, and spacing to your CSS. You can choose between 2 spaces, 4 spaces, or tab indentation. Optionally, you can sort all CSS properties alphabetically for a consistent code style across your project.
Minifying (Compress) removes all unnecessary whitespace, comments, and redundant characters to produce the smallest possible CSS file. The tool shows you the size before and after compression, along with the percentage saved.
Everything runs entirely in your browser using pure JavaScript. Your CSS code is never uploaded to any server, ensuring complete privacy and instant results.
How to Use
- Paste your CSS into the input box on the left, or click the Load Sample button to try with example CSS.
- Choose your mode: select Format to beautify your CSS, or Minify to compress it.
- Configure options (Format mode only): pick your preferred indentation size (2 or 4 spaces, or tab) and optionally enable alphabetical property sorting.
- Click the Format CSS (or Minify CSS) button. The result appears instantly in the output box on the right.
- Click Copy to copy the result to your clipboard, ready to paste into your project.
Frequently Asked Questions
Is my CSS data safe?
Yes, absolutely. All formatting and minification happens directly in your browser using JavaScript. Your CSS code never leaves your device and is never transmitted to any server. There is no data collection or storage whatsoever.
What is the difference between formatting and minifying?
Formatting (beautifying) adds whitespace, indentation, and line breaks to make CSS human-readable and easier to debug. Minifying (compressing) removes all unnecessary characters (spaces, line breaks, comments) to reduce the file size as much as possible, which improves page load times in production.
Does the tool handle nested rules and at-rules?
Yes. The formatter handles standard CSS, nested rules (such as those inside @media or @keyframes blocks), and properly indents each level. It strips CSS comments and normalizes whitespace before reformatting.
Will formatting change how my CSS works?
No. Both formatting and minification are lossless operations for the CSS rules themselves. The tool only changes whitespace, indentation, and optionally the order of properties (which does not affect rendering). Comments are removed during both formatting and minification.
Can I use this tool offline?
Once the page is loaded, the tool works completely offline because all processing is done client-side. You can even save the page and use it without an internet connection.