CSS MINIFIER & BEAUTIFIER

Compress, optimize, and format CSS code

CLIENT
100% client-side

Everything runs locally in your browser. Your data never leaves your device - no uploads, no servers, no tracking.

All processing happens directly on your machine using JavaScript. Close the tab and everything is gone. We literally never see your data.

Zero data transmission
INPUT
OUTPUT

Processing mode

Drop CSS files here or start typing

CSS
0 INPUT
0 OUTPUT
0% SAVED

Processing analytics

0
PROCESSED
0
BYTES SAVED
0%
AVG COMPRESSION
Minify
FAVORITE MODE
0
COPIED
100%
EFFICIENCY

How to use CSS Minifier & Beautifier

Optimize and format your CSS in seconds

Full Documentation Docs
1

Choose mode

Select Minify or Beautify
 

2

Configure options

Adjust minify or beautify settings

3

Input CSS

Paste code or upload files
 

4

Get results

Copy or download optimized CSS

100% Private - Nothing stored
Real-time processing
Safe AST-based parsing
Works on all devices

Why choose our CSS Minifier?

The most powerful CSS optimizer online

2 Operation modes

Switch between Minify (compress to smallest size) and Beautify (format for readability) with one click.

Maximum compression

Reduce file sizes by 20-40% with aggressive but safe optimization techniques.

Drag & Drop Support

Drag CSS files directly into the tool or upload from your device for instant processing.

Error detection

Automatic CSS syntax error detection with clear error messages and line numbers for quick fixes.

Advanced options

Fine-tune minification with options like comment preservation, value normalization, and vendor prefixes.

Auto-process mode

Enable real-time processing that automatically minifies or beautifies CSS as you type.

Frequently Asked Questions

Everything you need to know about CSS optimization

What is CSS minification?

CSS minification removes unnecessary characters (whitespace, comments, line breaks) from CSS code to reduce file size and improve loading speed without changing functionality.

Is CSS minification safe?

Yes. Our tool uses AST-based parsing to safely minify CSS without breaking your code. It preserves cascade order and specificity.

How much can I reduce CSS file size?

Typically 20-40% reduction, depending on your code style. Well-commented and formatted CSS can be reduced even more.

What is CSS beautification?

CSS beautification (or formatting) converts minified CSS back into readable format with proper indentation, line breaks, and consistent formatting.

Will minification break my CSS?

No. Our AST-based parser ensures safe optimization. It won't change cascade order, specificity, or break valid CSS. Always test in your environment though.

Can I customize optimization settings?

Yes. Customize individual settings for comment preservation, value normalization, empty rule removal, vendor prefix handling, and advanced options like media query merging and declaration sorting.

Is my CSS code safe with this tool?

Yes. Everything runs locally in your browser. Your CSS code never leaves your device - nothing is uploaded or stored anywhere.