CSS Beautifier, Format & Prettify CSS, SCSS & LESS Online
Paste minified or messy CSS, SCSS or LESS and get clean, consistently indented styles instantly. Prettier under the hood, syntax auto-detected, indent and print width your call, all client-side, nothing uploaded.
What is the css beautifier?
The CSS Beautifier formats and prettifies CSS, SCSS and LESS using the Prettier engine, auto-detecting the flavour and reflowing declarations, spacing, quoting and nested rules. Control indent width and print width, and get precise error line and column on malformed sheets. Free and browser-based, so your stylesheets never leave the tab.
The GigAI CSS Beautifier is a proper stylesheet formatter that runs 100% in your browser, powered by the same Prettier engine editors like VS Code use. Drop in CSS, SCSS or LESS (it auto-detects the flavour, or you can pin it) and it reflows the whole sheet into a clean, canonical shape: one declaration per line, normalised spacing around colons, braces and combinators, consistent quoting, and properly indented nested SCSS/LESS rules and media queries. You control the two knobs that actually matter for a stylesheet: indent width (2, 4 or tabs) and print width, so long selector lists and value shorthands wrap exactly how your team's style guide wants. When a sheet is malformed (an unbalanced brace, a stray token in a selector, an unterminated block) it doesn't fail silently. It surfaces the precise line and column and lets you jump straight to it. Because Prettier runs on your device, none of your design tokens, unreleased component styles or client CSS ever leave the tab: no upload, no logging, no account. It's the fastest way to turn a minified bundle or a hand-hacked stylesheet back into something a human, and a code reviewer, can read.
- Difficulty:
- Easy
- Typical time:
- ~15s
- Processing:
- 100% browser processing
Last updated
How to use the css beautifier
- 1
Paste, drop or import your styles
Paste CSS/SCSS/LESS into the left editor, drag a .css/.scss/.less file onto it, or click to browse. Or load a built-in sample to try it instantly.
- 2
Confirm the syntax
Leave it on Auto to detect CSS, SCSS or LESS, or pin the flavour if your file mixes conventions or lacks tell-tale syntax.
- 3
Set indent & print width
Choose 2-space, 4-space or tab indentation and a print width. Everything re-formats live as you change the options.
- 4
Fix any errors, then export
If the sheet is malformed, jump to the reported line and column to fix it. Then copy the result, download a formatted file, or share a link.
What CSS Beautifier includes
Auto-detects CSS, SCSS & LESS
Paste any of the three and the beautifier picks the right Prettier parser automatically: nested rules, @mixin, variables and interpolation are all understood. Pin the syntax manually whenever you want.
Your indent & print width
Set 2-space, 4-space or tab indentation and choose the print width so long selector lists, gradients and shorthand values wrap exactly the way your style guide expects.
Nested rules done right
SCSS and LESS nesting, media queries and selector lists are re-indented cleanly with consistent brace placement, so deeply nested component styles stay readable.
Precise parse errors
An unbalanced brace or stray token doesn't fail quietly. You get the exact line and column of the problem and a one-click jump straight to it.
Live as you type
Formatting runs on every keystroke with a smart debounce, so the output pane and error banner stay in sync. No 'Format' button dance required.
100% in your browser
Prettier runs on your device. Your design tokens, unreleased component CSS and client stylesheets are never uploaded, stored or logged.
Why use our css beautifier
Unminify bundles instantly
Turn a minified production stylesheet or a compiled CSS blob back into readable, indented source you can actually inspect and debug.
Consistent diffs across a team
One canonical format means Git diffs show real changes, not whitespace churn, reviews focus on the CSS that actually moved.
Match your style guide
Dialling in indent and print width reproduces your project's Prettier config, so pasted snippets land in exactly the house style.
Private by design
Everything runs locally, so you can safely format proprietary or pre-launch styles containing internal class names and tokens.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Frontend developer
Read a minified stylesheet
Paste a minified bundle from a network tab or dist folder to unminify it into properly indented rules you can trace a bug through.
- Design-system engineer
Normalise component styles
Run a batch of hand-authored SCSS partials through one canonical format so tokens, mixins and nested rules follow a single house style.
- Code reviewer
Kill whitespace-only diffs
Beautify both versions of a stylesheet with identical settings so a pull request shows the real declaration changes, not reflow noise.
- Student / learner
See how nesting expands
Format a compact SCSS example to watch nesting, selector lists and media queries lay out clearly with instant feedback on typos.
Supported formats
Accepts CSS, SCSS, LESS and TXT, and produces CSS, SCSS and LESS, all processed locally in your browser.
- CSS
- SCSS
- LESS
- TXT
- CSS
- SCSS
- LESS
Frequently asked questions
Recommended tools
JSON Formatter
Format, validate and minify JSON in your browser with pinpoint error line + column, jump-to-error, key sorting and live editing: nothing is uploaded.
JWT Decoder
Decode and inspect any JSON Web Token instantly. Read the header, payload and signature, see when it was issued and expires, and optionally verify an HS256 signature. 100% in-browser. Your token never leaves your device.
CSS Minifier
Minify and compress CSS in your browser with csso. Merge duplicate rules, collapse shorthand and shorten colors, then see the exact bytes and percentage saved. Nothing is uploaded.
Barcode Generator
Generate scannable 1D barcodes (CODE128, EAN-13, UPC-A, CODE39, ITF-14, MSI, pharmacode and Codabar) live in your browser, with per-format validation and PNG or SVG export. Nothing is uploaded.
Base64 Decoder
Decode Base64 back to text or a file instantly: Unicode-safe, auto-detects URL-safe input, sniffs binary data and offers a download. Runs fully in your browser, nothing uploaded.
Base64 Encoder
Encode text or any file to Base64 instantly: Unicode-safe, with a URL-safe toggle and one-click data URLs. Runs entirely in your browser, nothing uploaded.
Comparisons & guides
Go deeper on the concepts behind the css beautifier.
Common problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
My SCSS mixins/variables get flagged as errors in CSS mode.
Plain CSS doesn't understand $variables, @mixin or nesting. Switch the syntax selector to SCSS (or LESS for @variables and mixin() calls) so the right Prettier parser is used.
It reports an error but the line looks fine.
Prettier reports where parsing broke, which is often just after the real mistake, an unclosed brace or missing semicolon a few lines above. Jump to the reported line, then scan upward for the unbalanced block.
Long selector lists still wrap onto multiple lines.
That's print width doing its job. Increase the print width if you prefer selectors and long values kept on one line. Lower it to force earlier wrapping.
My comments moved or reformatted.
Prettier normalises whitespace around comments but never deletes them. /* block comments */ are preserved. Note that plain CSS has no // line comments. Those are only valid in SCSS/LESS.
Get the most out of it
Leave syntax on Auto for most files, only pin SCSS/LESS when a sheet lacks the tell-tale nesting or variable syntax.
Match your repo's Prettier config by setting the same indent width and print width here, so pasted snippets come out identical.
Press Ctrl/Cmd+Enter to re-run instantly and Ctrl/Cmd+S to download the formatted stylesheet.
Beautify both sides of a change with the same settings before a code review to eliminate whitespace-only diff noise.
Getting a parse error near the end? It's almost always an unclosed brace or a missing semicolon higher up the sheet.
What's new
Recent updates and improvements to the css beautifier.
Initial release, live CSS/SCSS/LESS beautifying with syntax auto-detection, 2/4/tab indent and configurable print width, precise line + column errors with jump-to-error, drag-drop import, undo/redo and shareable links.
Added keyboard shortcuts (run, download, clear, undo/redo) with an in-tool shortcuts helper, plus curated CSS, SCSS and LESS sample snippets.
Sharpened SCSS/LESS auto-detection and improved error messages for unbalanced braces and stray selector tokens.
Keep exploring
Problems we solve
Definitions
From the blog
- How to Find Exposed API Keys in Your Code (Before Someone Else Does)
- No AI Inside: How Our Regex Generator Actually Works
- How to Generate TypeScript Types from JSON (API Responses Made Type-Safe)
- Regex Cheat Sheet: Common Patterns and How to Test Them
- SVG Data URIs Explained: Inlining Vectors the Efficient Way
Explore categories
Compare formats
By file type
Common tasks
Your privacy is built in
Your CSS, SCSS or LESS is formatted entirely in your browser using Prettier running on your device. It is never uploaded to any server. Nothing is stored, logged or transmitted, so you can safely beautify proprietary design tokens, unreleased component styles or client stylesheets. Close the tab and every trace is gone.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the css beautifier?
Free, private and instant. CSS Beautifier runs right in your browser.