Will minifying CSS break my website?

No. Browsers do not need spaces or line breaks to understand CSS. Minifying simply removes these visual aids to save bandwidth.

Is this secure for proprietary code?

Yes, the minification happens entirely on your own device using JavaScript. Nothing is uploaded.

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Developer Tools

Compress your CSS code to reduce file size and improve website load times.

Last updated July 31, 2026

Reduces CSS file size by removing unnecessary spaces, comments, and line breaks.
Runs 100% locally in your browser — your code is never sent to a server.
Calculates exact byte savings instantly.

Optimizing website performance

Minify your production CSS before deploying to improve page speed scores.

Cleaning up inline styles

Compress large blocks of CSS before injecting them into HTML <style> tags.