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Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

CSS Minifier

Minify CSS code by removing whitespace and comments.

FreeRuns in browsercss minifierminify css
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About CSS Minifier

Minify CSS code by removing whitespace and comments. Minify and compress CSS code online for free. Remove whitespace, comments, and unnecessary characters. See file size comparison before and after compression. Removes unnecessary whitespace, comments, and redundant syntax to reduce file size significantly. Shows a real-time size comparison so you can see exactly how much space you saved. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: CSS Beautifier / Formatter, SASS/SCSS to CSS Converter, CSS to SASS/SCSS Converter

How to Use CSS Minifier

  1. Paste your code into the editor.
  2. Click Minify to reduce the file size.
  3. Copy the minified output and compare the size savings.

Frequently Asked Questions

What is CSS Minifier?
Minify and compress CSS code online for free. Remove whitespace, comments, and unnecessary characters. See file size comparison before and after compression.
How much size reduction can I expect?
Size reduction varies depending on the input, but typical minification removes 30-70% of file size by eliminating whitespace, comments, and unnecessary characters. The tool shows a before-and-after size comparison so you can see the exact savings.
Does minification break my code?
No, minification only removes characters that are syntactically unnecessary, such as whitespace, comments, and optional semicolons. The minified code is functionally identical to the original and will execute the same way.
What optimizations are applied?
The minifier removes whitespace, newlines, and comments. Depending on the language, it may also shorten variable names, collapse redundant syntax, and apply other safe optimizations that reduce size without changing behavior.
Is CSS Minifier free to use?
Yes, minification is entirely free. There are no file size limits, no usage caps, and no account required.
Is my data safe when using CSS Minifier?
Yes, your code never leaves your browser. All minification happens locally, so your source code remains private and secure.

Related Tools

CSS Beautifier / Formatter
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CSS to SASS/SCSS Converter
Convert plain CSS to SASS or SCSS syntax with nesting.