Can CSS minification break animations or transitions?

No, as long as the CSS is valid. Minification only removes whitespace — @keyframes rules, transition values, and timing functions are preserved exactly.

Can I undo minification to get the original back?

You cannot recover comments or exact whitespace from minified CSS. Always keep the original source file — the minified version is for deployment only.

Does minification change selector specificity?

No. Specificity is determined by the selectors themselves, not by whitespace. Minification does not alter any selectors.

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How to use this tool

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Paste your CSS and click Minify. Every style rule in the output is functionally identical to the original — only the characters that browsers ignore are removed.

How It Works

Step-by-step guide to compress css without losing quality:

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Paste your CSS
Paste your stylesheet into the input panel.
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Minify
Click Minify to produce the compressed version.
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Visual test
Apply the compressed CSS to your page and confirm all styles look identical.
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Deploy the compressed CSS knowing no quality has been lost.

When to use this guide

Use this when you or a team member is hesitant about CSS minification and wants assurance that compression will not break any styles.

Pro tips

Get better results with these expert suggestions:

Understand what minification does and does not do

CSS minification removes whitespace, comments, and optional trailing semicolons. It never changes selector logic, property values, or rule order. Your styles remain 100% intact.

Always keep the source file

The minified CSS is for deployment only. Keep your original, readable source CSS in version control so you can make future edits easily and uncompress at any time.

Do a visual regression test after compressing

After compressing, load your page in a browser and visually compare it against the uncompressed version. Screenshot comparison tools like Percy can automate this check.