CSS Beautifier & Formatter

How It Works

The tool tokenizes your CSS by scanning for curly braces, semicolons, and whitespace, then reconstructs each rule with consistent two-space indentation. Parsing runs entirely in your browser using JavaScript string operations — no library dependencies, no network requests, and no data leaves your device. The output is functionally identical to the input; only whitespace is changed.

Use Cases

Expanding minified CSS from a CDN bundle to inspect specific rules during debugging
Reformatting copy-pasted CSS from Stack Overflow or documentation before adding it to a project
Making auto-generated CSS from build systems or CSS-in-JS tools readable
Normalizing indentation across team members' CSS before committing to version control

Formatting Rules

The formatter places each property declaration on its own line, indents declarations inside rule blocks, adds a blank line between rules, and retains all comments. Vendor prefixes like -webkit- and -moz- are preserved exactly as written. Nested at-rules such as @media and @keyframes are indented one additional level.

For HTML and JavaScript formatting, see our HTML Beautifier tool.

Frequently Asked Questions

Does the CSS Beautifier handle vendor prefixes like -webkit- and -moz-?

Yes. The formatter preserves all vendor-prefixed properties and values exactly as written — it only adjusts indentation and spacing, never modifies property names or values.

Can I beautify CSS that contains SCSS or Less syntax?

This tool is designed for standard CSS. Variables and nested rules from SCSS or Less may not format correctly. Use a dedicated SCSS/Less prettifier for preprocessor syntax.

Is there a size limit on the CSS I can paste in?

There is no enforced limit. The formatter runs in your browser, so very large stylesheets (500 KB+) may take a moment, but they will format correctly.

CSS Beautifier