CleanorTools
CSS

CSS Beautifier

Details

How to use CSS Beautifier

What the tool does, how to run it, and what to expect from the result.

How to beautify and reindent CSS

Beautifying CSS takes a compressed, single-line stylesheet and expands it so that each rule has its own block and each declaration its own line. It is what you reach for when you have pulled a minified file out of a bundle and need to see what a rule actually says.

The formatting runs in your browser. Be aware that comments are not carried through, so use this on minified files rather than as the formatter for a stylesheet you maintain.

  • Paste the minified or badly formatted CSS into the input box.
  • Read the expanded output, where each rule opens a braced block and each declaration sits on its own indented line.
  • Copy the result into an editor to read or search through it.
  • Copy out any comments from the original first, because the formatter removes them.
  • For code you own, set up Prettier or stylelint in your editor instead, so formatting happens on save and comments survive.
Tips

Getting a better result out of CSS Beautifier

Specific settings and thresholds, not general advice.

  • Beautifying will remove your comments. The formatter minifies the input first and then re-expands it, so every /* comment */ in the stylesheet is discarded on the way through. If the CSS you are formatting contains notes you want to keep, copy them out before you run it.
  • Reformatting a stylesheet in one pass produces a diff that touches every line. If the file is in version control, commit the reformat on its own, with no behaviour change in it, so that reviewers can skip it and future blame lines stay meaningful.
  • This reindents, it does not restyle. It puts each declaration on its own line inside a braced block. It does not sort properties, normalise colour notation, add missing semicolons, or enforce a line length, which is what a real formatter such as Prettier or stylelint would do.
  • Formatting a minified vendor file makes it readable, not understandable. Class names in a compiled framework bundle are often generated, so expanding the whitespace shows you the rules without telling you which source file produced them. If a source map exists, DevTools will give you far more.
  • Whitespace has no effect on how CSS runs. Reformatting cannot break your styles by itself, so the only risk is what the formatter drops, which here is the comments.
Limits

What CSS Beautifier does not do

The honest boundary, so you do not lose time finding it yourself.

  • It discards all comments, because the input is minified before it is expanded.
  • It does not normalise declarations. It will not add a space after a colon in an already-compact declaration, so some lines stay tight even after formatting.
  • It does not sort properties, group related rules, or enforce any style guide, so it is a reindenter rather than a formatter.
  • It does not produce or consume source maps, so it cannot map a minified vendor bundle back to its original files.
At a glance

Who CSS Beautifier is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Developers and anyone working with code who needs quick formatting.

Ideal for

Quickly beautify CSS without a build step or install.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Are my comments preserved?

Yes. The beautifier reindents the stylesheet in place rather than minifying it first, so comments stay where you wrote them. That was the difference between formatting a file and quietly stripping it.

Can beautifying break my styles?

Whitespace is not significant in CSS between declarations, so reindenting on its own cannot change how a stylesheet behaves. The things that can change behaviour are the ones that remove content rather than move it, and here that is the comments. As a rule, if you diff the beautified output against the original and the only differences are whitespace and comments, the styles are safe.

Should I use this or my editor's formatter?

For a one-off inspection of a minified file you found in a bundle, this is quicker. For your own codebase, an editor-integrated formatter is strictly better: Prettier and stylelint preserve comments, enforce a consistent style, run automatically on save, and can be checked in CI so the whole team's output matches. A web page cannot be part of your commit hook.

Why is the reformatted file so much bigger?

Because you have added back the newlines and indentation that were removed. A minified stylesheet is a single long line, and expanding it to one declaration per line typically doubles or triples the byte count. That is expected and irrelevant, because you are producing a file to read, not a file to ship. Never deploy the beautified version.

Does my CSS leave the browser?

No. The formatting is a local string transformation. Nothing is uploaded or stored, which matters if you are inspecting a stylesheet from an unreleased project.

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