CSS Minifier
Compress CSS by removing whitespace and comments
How it works
- 1Paste your CSS
Drop any CSS — a single rule, a whole stylesheet, or a snippet from DevTools.
- 2Click minify
Comments, whitespace, and unnecessary semicolons are stripped instantly.
- 3Copy the minified output
Copy the result to your clipboard or see the size reduction stats.
About CSS Minifier
Free online CSS minifier. Strip comments, whitespace, and redundant semicolons from CSS to reduce file size — typically 20-40% smaller. Handy for one-off pastes when you don't want to spin up a full build pipeline. Runs entirely in your browser. CSS Minifier on 712 Tools runs entirely inside your browser using modern JavaScript APIs — no server ever sees your data. That means instant results, complete privacy, and no upload limits.
Whether you need to compress css by removing whitespace and comments for a debugging session, a quick sanity check, or a production incident, this tool is free to use as many times as you need. There are no watermarks, no sign-up, and no ads inside the tool itself.
Frequently asked questions
How much smaller does CSS get?
Typically 20-40%. Comment-heavy or well-formatted stylesheets shrink more; already-compact CSS shrinks less.
Does it break my CSS?
No. Only whitespace and comments are removed — the CSS grammar is preserved exactly.
Does it support CSS variables and modern syntax?
Yes. Custom properties, nested rules, container queries, and other modern features are preserved intact.
Should I use this in production?
For a real build pipeline, use PostCSS + cssnano or Lightning CSS. This tool is best for quick one-off minification.
Related tools
JS Minifier
Minify JavaScript by stripping whitespace and comments
HTML Beautifier
Format messy HTML with proper indentation
Word Counter
Count words, characters, sentences, paragraphs, reading time
Case Converter
Convert text to UPPERCASE, lowercase, camelCase, snake_case, kebab-case, and more
Lorem Ipsum
Generate placeholder text — paragraphs, sentences, or words
Text Diff
Compare two texts and highlight the differences