CSS Minifier

CSS Minifier

Compress & Optimize Your Stylesheets — Instantly In Your Browser

Paste or upload your CSS, choose your optimization options, and get a minified stylesheet in one click. Strip comments, collapse whitespace, and compress color values. See exact byte savings in the stats panel. Everything runs in your browser — your code never leaves your device.

🔒 Runs entirely in your browser — your code is never transmitted to any server

Options: Strip Comments Remove Whitespace Compress Colors

CSS Input

📂 Upload CSS File

Minified Output

Compression Results

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Original

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Minified

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Saved

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Reduction

All minification runs locally in your browser. No CSS code you enter is ever transmitted to a server. Always keep a backup of your original source file.

How to Use the CSS Minifier

Paste or Upload Your CSS

Type or paste your stylesheet into the CSS Input panel, or click Upload CSS File to open a .css file from your computer. The file loads instantly into the editor using your browser's built-in file API — nothing is sent to any server.

Choose Your Options

Three minification options are available and enabled by default: Strip Comments removes all /* ... */ blocks; Remove Whitespace collapses spaces, tabs, and line breaks; Compress Colors shortens six-digit hex values to their three-digit equivalent where valid (e.g. #FFFFFF → #FFF). Uncheck any option to preserve that element in the output.

Click Minify CSS

Press the Minify CSS button. The tool processes your stylesheet in your browser and displays the compact result in the Minified Output panel. The Compression Results panel shows your original file size, the new size, bytes saved, and the percentage reduction.

Copy or Download

Click Copy to copy the minified CSS to your clipboard with one click, or click Download .css to save the compressed stylesheet as a .min.css file directly to your computer, ready for production deployment.

Frequently Asked Questions

What does a CSS minifier do?

Is my CSS code stored on your servers?

What does the color compression option do?

Should I keep a copy of my original CSS?

How much will minification reduce my CSS file size?

Does this tool support CSS3, custom properties, and media queries?

How to Use the CSS Minifier

Frequently Asked Questions

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