CSS Beautifier and Formatter Online
Format compact CSS into readable rules with indentation. Use the output to inspect selectors and declarations or review a stylesheet.
CSS Beautifier & Formatter workspace
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.
Local input processing
Formatting runs in your browser. Your CSS is never uploaded, stored, or tracked.
CSS Beautifier: Format Minified CSS Online
Format compact CSS into readable rules with indentation. Use the output to inspect selectors and declarations or review a stylesheet. CSS beautification changes presentation, not the cascade or stylesheet architecture. Check strings, comments, and custom property values after formatting. For ongoing development, keep the unminified source in version control instead of relying on a formatted production file.
How to use the CSS beautifier
- Paste minified or messy CSS into the CSS Input panel, or click Example to load a sample.
- The Beautified CSS panel updates instantly — there is no "format" button to press.
- Read the stats bar to compare original size, beautified size, and the final line count.
- Click Copy to grab the result, or the download icon to save it as
toolk-beautified.css. - 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 / construct | What 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) |
| whitespace | All 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.
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Last updated: September 15, 2026 · Runs 100% in your browser — no uploads, tool input is not sent to Toolk.
Frequently asked questions
Can I switch the indentation to tabs or four spaces?
Not currently — output is fixed at two spaces per nesting level, one property per line, with a single space after each colon. If your styleguide demands tabs, a quick find-and-replace on the copied result is the fastest bridge.
Does the beautifier preserve my comments?
No. Every /* ... */ comment is stripped before formatting, including license banners and source-map annotations, so run a copy through the tool when those must survive. Minified production files have usually already lost them anyway.
Why does broken CSS still format instead of showing an error?
The engine is a token re-spacer, not a parser: it never validates syntax and clamps its brace-depth counter so unbalanced input prints with odd indentation rather than throwing. Unexpected indent levels are themselves the diagnostic — look for a missing or extra brace earlier in the file.
Is my stylesheet uploaded when I beautify it?
No. Formatting is processed locally in your browser as plain JavaScript string work, and Toolk's page analytics do not receive your CSS. Tool input is not sent to Toolk, and the page keeps working offline once loaded.
How do I get minified output back for production?
Run the formatted result through the CSS Minifier at /tools/css-minifier — beautifying and minifying are inverse whitespace operations, though comments removed along the way cannot be recovered by either direction.