Free Online CSS Formatter, Beautifier & Minifier
Paste a stylesheet above and click Beautify to expand it into one-declaration-per-line with proper indentation — including nested at-rules like @media and @supports — or Minify to compress it for production. Validate checks brace balance, the most common structural CSS error. All processing is local to your browser.
Why beautify CSS?
Production stylesheets ship minified: comments stripped, every rule on one endless line. When you inherit a project, debug a third-party theme, or inspect styles copied from DevTools, expanding that back into readable form is step one. Beautified CSS shows you selector structure, specificity patterns and media-query organisation at a glance.
Why minify CSS?
Minification removes comments, line breaks and redundant whitespace, and drops the final semicolon in each block. Typical savings run 15–30% of file size before gzip. Because CSS is render-blocking — the browser will not paint the page until stylesheets download and parse — smaller CSS directly improves First Contentful Paint and your Core Web Vitals scores. See our CSS minification guide for real numbers.
What the formatter handles
- Standard rulesets, multiple selectors per rule, and comma-separated selector lists.
- Nested at-rules:
@media,@supports,@keyframeswith proper double indentation. - Comments — preserved on beautify, stripped on minify.
- Strings in
contentandurl()values are protected and never altered. - Pseudo-classes and pseudo-elements (
:hover,::before) format correctly without a stray space being inserted.
Frequently asked questions
Does minifying change how my styles behave?
No. Whitespace in CSS is insignificant outside strings; the minified sheet is functionally identical.
Can it convert between spaces and tabs?
Yes — pick 2 spaces, 4 spaces or tabs from the Indent selector, then beautify.
Does it support SCSS or LESS?
It is built for standard CSS. Simple SCSS often formats acceptably, but nested syntax is not officially supported — compile first for guaranteed results.
Is my stylesheet uploaded?
No — formatting is pure in-browser JavaScript. It works offline once the page has loaded.