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CSS Minifier Online

Minify CSS, JavaScript, HTML or JSON in the browser: strip comments and whitespace, see the size saved instantly.

Processing... 0%
Parsing source code
Stripping comments
Collapsing whitespace
Measuring size savings

Result

This page opens the code minifier with CSS preselected. Paste a stylesheet, press the button, and you get a single compact line: comments removed, whitespace collapsed around braces, colons, semicolons and commas, and the redundant last semicolon before every closing brace dropped.

CSS responds very well to minification because formatted stylesheets are mostly indentation and comments — typical savings run between 15% and 40% of file size. Smaller CSS means the browser starts rendering sooner, since stylesheets are render-blocking resources: every kilobyte trimmed from CSS shortens the time to first paint on slow connections.

The minifier is careful where it matters: strings in content properties and url() values are copied verbatim, and spaces around selector-level colons are kept so combinators like "a :hover" keep their meaning. The size panel shows bytes before and after plus the percentage saved, and the result can be copied or downloaded in one click.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Four languages in one tool: CSS, JavaScript, HTML and JSON.
  • String, template-literal and regex-aware JavaScript scanner that never breaks literals.
  • HTML mode preserves pre, textarea, script and style content verbatim.

Key Benefits

✓ Conservative, safe minification: comments and whitespace only, no renaming — your code keeps working exactly as before.
✓ Your source code never leaves the browser — safe even for proprietary or unreleased code.
✓ Before/after size with percent saved shows exactly what the minification bought you.

Use Cases

  • • Minify a stylesheet before inlining it into an email template or an AMP page with a CSS size budget.
  • • Compress an inline script or bookmarklet safely — comments and whitespace go, variable names stay.
  • • Validate and minify a JSON config to a single compact line before shipping it to production.