Related Tools
JavaScript MinifierConcatenate, uglify & compress
CSS AutoprefixerVendor prefixes + Browserslist
CSS → TailwindConvert CSS to utilities
Tailwind → CSSExpand utilities to CSS
HTML FormatterPrettify HTML, CSS & JS
Tailwind FormatterSort & group classes
HTML → JSX ConverterConvert HTML to React
Diff CheckerCompare text & codeCSS Minifier & Beautifier Online — Minify and Format CSS Free
What's included
Features
About this tool
Minify CSS for Production or Beautify Minified CSS for Readability — No Build Tools Required
You need to reduce your CSS file size before deploying, but you don't have a build pipeline set up. Or you copied a minified stylesheet from browser DevTools or a CDN and you can't read a word of it. Paste it here, click Minify or Beautify, and the result is ready in under a second — with an exact byte count showing how much was saved or expanded.
The minifier strips everything the browser doesn't need: whitespace, comments, blank lines between rules, and trailing semicolons before closing braces. The browser parses minified CSS identically to developer-formatted CSS — the only difference is file size. For a typical stylesheet with generous whitespace and inline comments explaining each section, minification reduces file size by 25–50%. That's bandwidth saved on every single page load, without touching your source files or setting up webpack, Vite, or any npm package.
The beautifier goes the other direction. Minified CSS is technically correct but practically unreadable — a third-party library's stylesheet, a CMS-generated file, a design tool's output, or your own production build from DevTools all arrive as a wall of text with no structure. The beautifier adds 2-space indentation, puts each property on its own line, and adds blank lines between rule blocks — the same formatting Prettier uses for CSS. One click converts an unreadable single line into a navigable, editable stylesheet.
A stats bar shows input size, output size, bytes saved, and percentage change immediately after every operation — so you always know whether the optimization was worthwhile. History saves up to 15 timestamped snapshots per session; click any entry to restore both the input and output instantly. Everything runs in your browser with no server request, no sign-up, and no file size limit.
Step by step
How to Use
- 1Paste or upload your CSSPaste your CSS directly into the editor on the left — anything from a single rule block to a complete multi-section stylesheet. Or click Upload to load a
.cssfile from your computer, or drag and drop a.cssor.txtfile directly onto the editor area. The editor accepts both formatted and already-minified CSS. - 2Click Minify or BeautifyClick Minify to compress the CSS for production: strips all comments, whitespace, blank lines between rules, and trailing semicolons before closing braces. The browser parses minified CSS identically — the only change is file size. Click Beautify to format minified or poorly-indented CSS for readability: adds 2-space indentation, puts each property on its own line, places the opening brace on the selector line, and adds blank lines between rule blocks.
- 3Check the stats barAfter every Minify or Beautify operation, the stats bar at the top shows the full comparison: input size, output size, bytes saved (or added for beautification), and the percentage change. For well-commented, generously spaced CSS, minification typically achieves 25–50% reduction. The stats update instantly so you know whether the optimization is worthwhile before committing.
- 4Edit, refine, and reprocessClick Edit to move the current output back into the input area — useful for making manual adjustments and then running Minify or Beautify again. The Edit button lets you chain operations: beautify a file to read it, make edits, then minify the revised version. Click Clear to reset both panels and start over.
- 5Copy or download the outputClick Copy to copy the full processed CSS to your clipboard with a confirmation toast. Click Download to save the output as a file —
.min.cssfor minified output,.cssfor beautified. When a file was uploaded, the download filename is derived from the original filename; pasted content defaults tostyle.cssorstyle.min.css. - 6Restore previous sessions from HistoryClick History to open the history panel. Every Minify and Beautify operation is automatically saved as a timestamped snapshot (up to 15 entries). Each entry shows the operation type, input size, and output size. Click any entry to restore both the original input and the processed output — useful for comparing multiple versions, recovering from accidental edits, or switching between files worked on in the same session.
Real-world uses
Common Use Cases
Got questions?
Frequently Asked Questions
Paste your CSS into the editor and click Minify. The minifier removes whitespace, comments, blank lines between rules, and trailing semicolons — everything the browser doesn't need. The stats bar immediately shows the input size, output size, bytes saved, and percentage reduction. Click Download to save the result as a .min.css file. No webpack, Vite, Node.js, or npm installation required.
For typical developer-formatted stylesheets with generous whitespace and inline comments, minification reduces file size by 25–50%. The exact amount depends on how much whitespace and how many comments are in the original. The stats bar shows the precise byte count and percentage after every minification — so you know immediately whether the optimization was worthwhile for that specific file.
No. CSS minification only removes whitespace, comments, and trailing semicolons — none of which affect how the browser parses or applies style rules. The rendered page looks identical before and after minification. If you see a rendering difference, it means a pre-existing CSS syntax error was present in the original that minification exposed, not a problem introduced by the minifier.
Paste the minified CSS into the editor and click Beautify. The beautifier adds 2-space indentation inside rule blocks, puts each property on its own line with a semicolon, places opening braces on the same line as the selector, and adds blank lines between rule blocks. The result matches the formatting conventions used by Prettier and modern CSS style guides. Works on any minified CSS — from third-party libraries, CDN-served stylesheets, browser DevTools, or your own production builds.
Yes. Click Upload to open a file picker, or drag and drop a .css file directly onto the editor area. The file loads instantly into the editor. After minifying or beautifying, click Download to save the result — as .min.css for minified output or .css for beautified — with the filename derived from the original uploaded file.
Every time you click Minify or Beautify, a timestamped snapshot is automatically saved to the history panel (up to 15 entries). Each entry shows the operation type, input size, and output size. Click any entry to instantly restore both the original input and the processed output together. This lets you compare multiple versions of a stylesheet, recover from accidental edits, or switch between several files you were working on in the same session.
No. All processing runs entirely in your browser using JavaScript. Your CSS is never transmitted over the network, never stored on any server, and never logged anywhere. Safe for proprietary stylesheets, client work, and any CSS you wouldn't want shared with a third-party service. The tool also works fully offline once the page has loaded.
They are complementary. Minification removes unnecessary characters from the CSS source before it is served. Gzip or Brotli compression is applied by the web server when transmitting the file to the browser — it finds repeating byte patterns and encodes them more efficiently. Both work best together: minify first, then let your server apply gzip. Minification typically reduces file size by 25–50%; gzip on top of that adds another 60–80% reduction.