CSS Beautifier

A CSS Beautifier takes a compressed stylesheet, often one long line, and spreads it back out into readable rules. This one runs the js-beautify CSS formatter in your browser, free, with nothing uploaded. Each declaration gets its own line and nested blocks step in by depth, with your choice of indent.

How the CSS Beautifier works

Paste in the compressed sheet and the formatter reads its braces and strings, then writes the sheet out again with one declaration per line. Media queries, keyframes and other nested blocks indent by their depth, so the shape of the sheet is visible before you read a single property.

1. Paste CSS into the box, or drop a .css file onto the page.
2. Pick an indent: 2 spaces, 4 spaces or a tab.
3. Read the formatted output as it updates.
4. Use the structure to find the rule you came for. Selectors now start at the edge of their block level.
5. Copy the formatted CSS, or download it as a file.

Vendor prefixes and custom properties pass through in place. The formatter moves whitespace and nothing else, so the cascade order of your rules comes out in the same order you pasted it in.

Where a CSS Beautifier earns its place

The lost-source case comes first. A vendor library ships only a minified sheet, or the readable original of an old project is long gone, and you need to patch one rule or see how a class is built. Beautify the file and the sheet becomes something you can search, read and edit with confidence again.

Copied CSS is the second case. Styles lifted from browser developer tools, a code snippet in a ticket, or a block pasted out of a chat window rarely arrive with their shape intact. Format before merging anything into your own sheet, so your file keeps one consistent style. The JS Beautifier does the same rescue job for a compressed script.

Review and learning tie for third. Readable structure is what makes a stylesheet safe to edit, because a media query that swallows half the sheet by accident is visible the moment the nesting is laid out. Once the sheet is edited and ready, the CSS Minifier shrinks it back down for shipping.

CSS Beautifier limits, in plain terms

A beautifier restores whitespace only. That one sentence carries the biggest limit on this page. Shortened names a minifier invented stay shortened, and comments it deleted stay deleted. No formatter can bring them back. If the class names in a minified sheet look like short codes, the readable original is the only place the real names still exist.

The formatter follows structure, not meaning. It tracks braces and strings so blocks nest correctly, but it does not check that properties or values are real. A misspelled property like colr: red formats into a neat line and stays wrong, the same way a browser quietly ignores it. Neat output is not a clean bill of health.

Preprocessor syntax is the last edge. SCSS and Less add variables, mixins and a nesting style of their own that plain CSS does not have. This formatter is built for plain CSS, and preprocessor files can come out oddly shaped. Compile or convert them to plain CSS first, then beautify the result.

Your CSS stays on your device

The formatter runs inside your browser tab. Your CSS is never sent to a ToolPeko server, never stored and never read by anyone here. A stylesheet from an unreleased redesign takes the same code path as a public library file. There is no account, no sign-up and no formatting counter. Paste a rule or a whole design system and the terms stay the same.