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CSS Minifier

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Code & Dev

CSS Minifier

Minify CSS code for faster page loading.

Workspace

Run the tool here

Browser utility

Output

Run the workspace to see the response here.

How to use

Paste the stylesheet.
Minify and check the output size.
Test the minified file on a staging page.

About this tool

Minify CSS by removing comments, whitespace and redundant characters while keeping the rules intact.

CSS Minifier is part of the TmpMailer Code & Dev set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

Reducing a custom stylesheet before deploy.
Preparing critical CSS for inlining.
Checking how much whitespace a framework emits.

Common questions

Does minification change specificity?

No. It only removes insignificant characters, so the cascade is preserved.

Can it break custom properties?

Rarely, but whitespace inside values can matter. Test computed styles after minifying.

Is gzip enough on its own?

Compression helps, but minifying first reduces the payload that gets compressed.

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