CSS Minifier | Free Online CSS Compressor

CSS compressor and minifier that strips comments, whitespace and redundant semicolons, shortens hex colors, and shows the exact bytes saved. Free.

Updated September 18, 2026

Also known as: minify css online · online minified css · compress css · compressor css · css minifier online · online css compressor · css compressor tool · compress css online · reduce css size · css optimizer online

css tools

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code formatters and minifiers

minifiers

Auto-validate

CSS Input

Minified Output

Minification Options

Remove Comments

Strip all comments from CSS

Remove Whitespace

Remove unnecessary spaces

Remove Line Breaks

Combine all lines into one

Compress Font Weight

Convert font-weight names to numbers

Compress Colors

Convert colors to shortest form

Compression Statistics

Statistics will appear after minification.

About CSS Minifier & Optimizer

A CSS compressor and minifier that takes a stylesheet and returns the smallest equivalent CSS. It strips comments, whitespace and the last semicolon in each rule, shortens hex colors from #RRGGBB to #RGB, and reports the exact bytes saved. Use it as the final step before shipping a production stylesheet to a CDN such as CloudFront or a us-east-1 origin.

Key Features

Advanced minification to remove comments, whitespace, and line breaks
Color compression to convert hex colors to shortest form (#RRGGBB to #RGB)
Font weight optimization with numeric value conversion
Customizable optimization options for selective processing
Compression statistics showing exact space savings
Built-in CSS syntax validation for error detection
File upload and download capabilities for batch processing
Copy to clipboard or download results as .css files

Use Cases

Production deployment - compress a stylesheet before it ships to a live .com site
Core Web Vitals - cut render-blocking CSS bytes to improve LCP
CDN preparation - shrink files served from CloudFront or a us-east-1 origin
Mobile optimization - reduce data usage for users on cellular connections
Build process integration - sanity-check what a webpack or Vite minifier produced
Bandwidth optimization - lower egress costs on high-traffic stylesheets
Legacy cleanup - strip years of accumulated comments from an inherited stylesheet

Supported Formats

CSS (Cascading Style Sheets)

Minified CSS Output

CSS3 Properties and Values

Media Queries

CSS Comments

Hex Color Codes

Related Keywords

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How much smaller does a CSS compressor make a file?

Most stylesheets shrink by roughly 20 to 40 percent, and almost all of that comes from comments and indentation rather than clever rewriting. The bigger win is stacking it with gzip or Brotli on your server: minified CSS compresses better because there is less repeated whitespace left for the algorithm to encode. Minify first, then let the server compress.

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is CSS Minifier used for?

CSS compressor and minifier that strips comments, whitespace and redundant semicolons, shortens hex colors, and shows the exact bytes saved. Free.

Is CSS Minifier free to use?

Yes. CSS Minifier is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use CSS Minifier?

No. CSS Minifier works immediately in your browser with no signup, login, or email address required.

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