CSS Formatter / Minifier
Beautify or minify CSS code. Format CSS for readability or compress it for production use. Useful for audits, email development, and optimization.
CSS Input
Formatted Output
Formatted CSS will appear here
About CSS Formatter
This tool formats and beautifies CSS with consistent indentation and one rule per line, or minifies it by stripping comments and whitespace — entirely in your browser. Paste, upload, or load the sample and the result appears instantly. Perfect for tidying up compiled stylesheets and shrinking payloads.
About CSS Formatter / Minifier
A CSS formatter and minifier is a comprehensive styling tool that beautifies messy CSS code with proper indentation, spacing, and organization for enhanced readability, or compresses CSS by removing whitespace, comments, and unnecessary characters to optimize file size. This tool is crucial for both development workflows and production optimization.
Why use a CSS Formatter / Minifier?
Using a CSS formatter ensures consistent, readable code that's easier to maintain and debug, while the minifier significantly reduces file sizes for faster page load times and improved website performance. It helps maintain coding standards across teams, simplifies CSS audits and reviews, and optimizes stylesheets for production without sacrificing functionality, ultimately enhancing both developer productivity and user experience.
Who is it for?
This tool is indispensable for web developers organizing and optimizing CSS stylesheets, front-end developers preparing production-ready code, email developers working with inline styles, UI/UX designers cleaning up generated CSS from design tools, and development teams maintaining consistent CSS formatting standards across projects and ensuring optimal website performance.
How to use the tool
Paste your unformatted or minified CSS code into the input area
Select Format mode for readable output or Minify mode for compression
Click the Format CSS (or Minify CSS) button to process your CSS; pasting, uploading a file or loading the sample runs it automatically
Review the formatted output with improved structure or reduced file size
Copy the processed CSS code for use in your stylesheets or production environment
Frequently Asked Questions
How do I format and beautify CSS code?
Paste your CSS into the input area (or upload a .css file, up to 5 MB). The tool re-indents with 2 spaces, puts one declaration per line and separates rules with a blank line. There are no indent-size or brace-placement settings. Copy the formatted output. Runs entirely in your browser — your CSS never leaves the device. Useful for: cleaning up minified CSS, standardizing team coding style, debugging unreadable third-party styles.
What's the difference between formatting and minifying CSS?
Formatting (beautifying) adds whitespace, line breaks, and indentation to make CSS human-readable. Minifying removes whitespace and comments (except /*! licence comments) and shortens values where it is safe, so the CSS is smaller for production delivery. Use formatting during development for readability and debugging; use minification for the production build (typically handled by your build tool automatically). This tool offers both modes; switch with the Format / Minify toggle.
Is my CSS sent to a server?
No — formatting and minifying run entirely in your browser via JavaScript. Your CSS never reaches a server, never gets logged. Verify in DevTools' Network tab: the only request is loading the minifier code itself the first time you minify, never your CSS. Safe for proprietary stylesheets, internal design system code, or any CSS you'd rather not log on a third-party service.
Does this validate CSS syntax?
No. Format mode does not check syntax: it re-indents whatever you paste, including broken CSS. Minify mode parses the CSS and silently drops anything it cannot parse; if nothing valid is found it shows an error. Neither mode checks property names, value types or specification compliance. For validation, use the W3C CSS Validator or a linter such as Stylelint.
How do I configure indentation?
You can't — the formatter always indents with 2 spaces and puts the opening brace on the same line as the selector (`selector {`). That matches most modern style guides. If your project needs 4 spaces or tabs, reformat the output in your editor afterwards.
Can I format SCSS, LESS, or Stylus?
Basic SCSS and LESS usually format fine in Format mode, since nesting and variables are close to plain CSS syntax, but the tool is built for plain CSS. Minify mode uses a CSS parser and drops anything it doesn't understand, so don't minify SCSS or LESS — compile it to CSS first. Stylus syntax (no braces or semicolons) is not supported.
Will formatting change my CSS behavior?
No — formatting only changes whitespace and indentation, not selectors, properties or values, and it never adds or removes semicolons. Minifying does change the text: it removes whitespace and comments, shortens some values (colors, zeros) and drops anything that isn't valid CSS, but it does not merge or reorder rules, so the cascade order stays the same. The browser treats formatted and minified CSS identically. Compare the result in your page if the stylesheet relies on unusual or invalid syntax.
When should I format CSS vs use a CSS linter?
Formatting (this tool) handles spacing and indentation. Linting handles rules: 'don't use !important', 'prefer rem over px', 'no duplicate selectors'. Both are useful but separate. For ad-hoc cleanup of paste-in code, use this formatter. For production codebases, run a linter in your build pipeline and format on save in your editor so the style stays consistent across the team.
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