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About this tool
Compress CSS with industrial minification or reformat it with Prettier-style beautification. All processing happens locally in your browser.
How to use
- Paste your CSS into the input box.
- Choose Minify to shrink it or Beautify to reformat it, then set the indentation.
- Copy the result; invalid CSS is flagged inline.
Is my CSS uploaded anywhere?
No. Minification and beautification happen entirely in your browser.
Will minifying change my CSS behavior?
No. Minification uses the csso optimizer, which strips whitespace and merges redundant declarations and selectors — it is designed to keep your rules behaving as written.