Skip to main content
toolk.site

CSS Beautifier: Format Minified CSS Online

Paste minified or one-line CSS and get clean, 2-space-indented code instantly. Built for debugging stylesheets and code reviews. Free and runs 100% in your browser.

Need to minify CSS instead? Use CSS Minifier →
CSS Input
0 chars
Beautified CSS
0 chars

2-Space Indentation

Each nesting level adds two spaces, with one property per line and one space after every colon.

Readable in One Step

Output updates as you type. Turns one-line minified CSS into structured, scannable code.

100% Private

Formatting runs in your browser. Your CSS is never uploaded, stored, or tracked.

Security: Secured Client-Side Stylesheet Engine
Compliance: W3C CSS Technical Standards

CSS Beautifier: Format Minified CSS Online

A CSS beautifier turns minified or one-line CSS back into readable code. Paste a stylesheet, and this tool re-indents it with 2 spaces per level, puts one property per line, adds a space after each colon, and separates rule blocks with a blank line. Output updates as you type. It runs 100% in your browser, free and you can copy it or download toolk-beautified.css.

How to beautify CSS

  1. Paste minified or messy CSS into the CSS Input panel, or click Example to load a sample.
  2. The Beautified CSS panel updates instantly — there is no "format" button to press.
  3. Read the stats bar to compare original size, beautified size, and the final line count.
  4. Click Copy to grab the result, or the download icon to save it as toolk-beautified.css.
  5. Heading to production? Reverse the process with the CSS Minifier to strip the whitespace back out.

What a CSS beautifier does — and what it does not

To a browser, CSS whitespace and comments are insignificant: .a{color:red} and a 20-line indented version are identical at parse time. A beautifier exists purely for humans. This one is a token re-spacer, not a parser. It collapses all runs of whitespace, then inserts line breaks and indentation around {, }, ;, and : based on brace depth. It does not build a syntax tree, reorder properties, or validate anything.

That distinction drives the cascade work it helps with. Per the MDN cascade reference, conflicting declarations resolve in this order: origin and importance, then specificity, then scope proximity, then order of appearance — the last matching rule of equal weight wins. Clean indentation makes the offending selectors and their nesting visible, which is why beautifying a minified file is usually the first step in debugging an override you cannot explain.

"In case of equality with an origin, the specificity of a rule is considered... the declaration with the highest specificity wins."— MDN Web Docs, Introduction to the CSS cascade

Worked examples: input → output

Minified rule · input

.btn{color:#fff;padding:8px 16px}

Beautified · output

.btn {
  color: #fff;
  padding: 8px 16px;
}

Nested at-rule · @media indents one level deeper

@media (min-width: 768px) {
  .grid {
    display: grid;
  }
}

Edge case · comments are removed

The input /* theme */ .a{color:red} beautifies to just .a { color: red; }. Every /* ... */ comment is stripped first — including license banners and source-map annotations — so beautify a copy if you need to keep them.

Formatting rules this tool applies

These are the exact transforms the engine runs, top to bottom. Indentation is fixed at 2 spaces; there is no tab or 4-space option.

Token / constructWhat the beautifier does
{Adds a space before, a newline after, and increases indent one level
}Decreases indent, places on its own line, adds a blank line before the next rule
;Ends the declaration and breaks to a new indented line
:Adds exactly one space after (property: value)
whitespaceAll existing tabs, spaces, and newlines are collapsed, then rebuilt
/* */Removed entirely before formatting

It formats, it does not repair

Because this is a re-spacer and not a real CSS parser, a missing or extra brace will not throw an error — the depth counter is clamped so it never goes negative, and the broken structure simply prints with the wrong indentation. That is a useful tell: if your beautified output indents in a way you did not expect, you almost certainly have an unbalanced { or } earlier in the file.

One more thing most beautifiers gloss over: you cannot fully reverse minification. Comments are gone and the original line structure was discarded by the minifier. CSS minification usually shrinks files 20 to 50 percent, and a beautifier only adds whitespace back — not your authoring intent. For real debugging of production builds, ship source maps so DevTools can map the live rule back to your source.

Runs 100% in your browser

Your CSS never leaves your device. Formatting is plain JavaScript that runs locally, and copy uses your browser's native clipboard — no uploads, and it keeps working offline. I tested it on one-line minified bundles, deeply nested media queries, files with stray comments, and inputs with mismatched braces. The legible cases format cleanly and instantly; the broken ones pass through so you can spot the fault.

Frequently asked questions

Is this CSS beautifier free?

Yes — 100% free with no signup and no usage cap. Format any stylesheet, then copy it or download it as toolk-beautified.css.

Does my CSS get uploaded anywhere?

No. Everything is formatted in your browser with JavaScript, so nothing is sent to a server and the tool works offline once the page loads.

Can I change the indentation to 4 spaces or tabs?

Not currently. The output is fixed at 2 spaces per nesting level, with one property per line and a space after each colon.

Does it keep my comments?

No. Every /* ... */ comment is stripped before formatting. Beautify a copy if you need to preserve license headers or annotations.

Related CSS & frontend tools

CSS Minifier

Strip whitespace back out for production

CSS Specificity Calculator

Score selectors and debug cascade conflicts

CSS Gradient Generator

Build linear and radial gradient backgrounds

CSS Filter Generator

Tune blur, brightness, and contrast filters

CSS Clip-Path Generator

Shape elements with clip-path polygons

Flexbox Generator

Generate flex layouts visually

CSS Grid Generator

Lay out grid templates and gaps

Border Radius Generator

Round corners with live preview

Color Converter

Convert HEX, RGB, and HSL color values

HTML Formatter

Indent the markup these styles target

Last updated: June 2, 2026 · Runs 100% in your browser — no uploads, nothing leaves your device.

Need a different tool?

Browse all 89 free, in-browser tools — or tell us what we should build next.

Browse all tools