CSS Minifier
Free online CSS minifier - compress stylesheets by removing comments and whitespace. Runs locally in your browser, no upload, no account required.
Runs locally in your browser. Your input is not uploaded to DevToolMate servers.
Minify only
Minifies CSS text only. Selectors are not executed and styles are not injected into the page.
Developer Quick Tips
- Paste CSS and minify instantly - removes comments and collapses whitespace while preserving quoted strings and url() values.
- Compress CSS for production builds, email templates, and embedded styles without uploading your code to any server.
- Download minified output as a .css file or copy directly from your browser - no account, no login, no limits.
- Safe for all CSS rules - single and double quotes in content and url() are protected during minification.
- Optimize stylesheet file size for faster page loads and lower bandwidth costs on static assets.
Frequently asked questions
What is an online CSS minifier?
An online CSS minifier is a free tool that compresses stylesheets by removing comments and redundant whitespace. DevToolMate's CSS minifier runs entirely in your browser - no upload to servers, no processing delays, no account needed.
How do I minify CSS online for free?
Paste your CSS into the tool and click Minify. The tool removes /* block comments */ and collapses extra spaces around braces, colons, semicolons, and commas. Download the result as a .css file or copy it directly to your clipboard.
Can I compress CSS without uploading my code?
Yes. CSS Minifier runs locally in your browser. Your input never leaves your device and is not sent to DevToolMate servers. Processing happens entirely in your browser session, so your code stays private.
Does minifying CSS preserve quoted strings and url() values?
Yes. Single- and double-quoted strings are preserved during minification, so url() values, content properties, font-family declarations, and other quoted literals stay intact and valid.
Is the CSS minifier free and do I need an account?
CSS Minifier is completely free with no account required. No login, no sign-up, no limits. Your input stays private on your device for the current session and is not persisted after you close the tab.
What are common uses for CSS minification?
Minify CSS for production deployments to reduce file size, optimize email templates with inline styles, embed CSS in HTML without extra whitespace, and lower bandwidth costs on static assets.
Can I use this CSS minifier for embedded styles and inline CSS?
Yes. The tool works for any CSS text - production stylesheets, inline styles, email templates, or embedded CSS blocks. Minified output is text only and is never injected or executed on the page.
Related tools
- CSS Formatter: Format and beautify CSS online in your browser. Pretty-print minified stylesheets with custom indentation. No upload, no account, privacy-first.