CSS Minifier & Stylesheet Compressor
Compress and minify CSS stylesheets by removing whitespace, line breaks, and comments.
Batch workspace
Format multiple files locally in one run.
How to use the CSS Minifier
Paste code or file
Paste your raw CSS text or upload directly.
Configure options
Choose indentation, dialect, or formatting preferences.
Format & export
Click format, then copy, download, or inspect in tree view.
What is a CSS Minifier?
Compress and minify CSS stylesheets by removing whitespace, line breaks, and comments. This tool re-indents and organizes code according to standard style conventions while checking for syntax validity. Everything executes 100% inside your browser, guaranteeing zero latency and complete privacy for API keys, user tokens, and confidential database schemas.
Options Explained
| Option | Description |
|---|---|
| Strip Comments | Remove all block /* ... */ comments from the minified stylesheet output. |
Frequently Asked Questions
Why should I minify CSS?
Minifying CSS reduces stylesheet payload sizes by 20% to 50%, improving First Contentful Paint (FCP) and Google Core Web Vitals.
Does CSS minification break valid layout rules?
No. Minification only strips non-functional whitespace, newlines, and comments without altering CSS declarations.
Is my data uploaded when I use the CSS Minifier?
No. All processing runs entirely in your browser. Nothing is sent to a server unless you explicitly create a share link.
Does this tool work offline?
Yes. After the first visit, the PWA service worker can serve the page and run the formatter without a network connection.
What is the maximum input size?
Most tools accept up to about 5MB in the editor. Very large inputs are processed preferentially in a Web Worker and may download instead of filling the output pane.