Instantly beautify, minify, validate and analyse your CSS code — with vendor prefix detection. Works 100% in your browser.
A CSS formatter — variously called a CSS beautifier, CSS pretty-printer, or CSS code formatter — is a developer utility that transforms compressed, minified, or disorganised Cascading Style Sheets into neatly structured, consistently indented code. Whether you have received a production build's style.min.css or accumulated years of quick-fix overrides, a CSS formatter makes the codebase instantly readable and maintainable.
How to beautify CSS: Paste your CSS into the input panel, select your preferred indentation (2 spaces, 4 spaces, or tabs) and brace placement, then click Format CSS. Each rule block is separated with a blank line, every declaration is placed on its own line, and properties are sorted logically. The built-in Check Prefixes feature scans your rules and highlights any properties that still require -webkit-, -moz-, or -ms- vendor prefixes for broader browser support.
CSS best practices enforced by this tool include: consistent selector formatting, one property per line, semicolons after every declaration, and zero-value unit removal (e.g. 0px → 0). Formatted CSS reduces review time, simplifies debugging in browser DevTools, and integrates cleanly into Git pull requests. Use the Minify option to generate the smallest possible stylesheet for your production CDN.
Everything a professional CSS workflow demands, free in your browser.
Instantly highlights missing semicolons, unmatched braces, unknown properties, and malformed values as you type.
Distinct colours for selectors, properties, values, at-rules, and comments for instant visual orientation.
Strips all whitespace and comments to produce the smallest possible CSS file for faster production page loads.
Detects properties that need -webkit-, -moz-, or -ms- prefixes for cross-browser compatibility.
Choose opening brace placement (same line or new line) and indentation type to match your team's style guide.
See rule count, property count, character savings, and processing time at a glance in the stats bar.
All CSS processing runs locally in your browser. Your stylesheets are never uploaded to any server.
Fully responsive layout with no horizontal scrolling. Works perfectly on phones, tablets, and desktops.
No sign-up, no installation. Clean CSS in seconds.
Drop your raw, minified, or messy CSS into the input editor — or click "Load Sample" to try an example instantly.
Pick your indentation style, brace placement, and optionally run the vendor prefix checker.
Click "Format CSS", then copy to clipboard or download the result as a .css file.
Common questions about CSS formatting and beautification.
CSS formatting (beautification) adds indentation, line breaks, and spacing so humans can read and edit the code easily. CSS minification removes all unnecessary whitespace, comments, and sometimes shortens values to reduce file size for faster page loads. Neither process alters how the browser renders the styles.
No. Our CSS formatter only changes whitespace and line breaks. The selector order, property declarations, and rule structure are preserved exactly as in the original. Specificity, cascade order, and inheritance are completely unaffected.
The formatter supports all modern CSS including CSS3 properties, custom properties (variables), media queries, keyframe animations, CSS Grid, Flexbox, pseudo-classes, pseudo-elements, at-rules (@import, @font-face, @supports), and nested selectors used in SCSS-like tooling.
Vendor prefixes (-webkit-, -moz-, -ms-) are browser-specific property prefixes that were required during the experimental rollout of CSS features. While modern evergreen browsers largely no longer need them, some properties like -webkit-text-stroke or old -ms-grid syntax still require prefixes for full support across all user agents.
Yes. Completely free, unlimited, and no account required. Every feature — formatting, minification, validation, vendor prefix checking — is available at no cost.
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