CSS Formatter Online: Format and Beautify CSS

How to Format CSS Online

Use the CSS formatter when a stylesheet is hard to scan, whether it came from a build output, a copied component, or a file that has collected quick edits. The tool accepts CSS text directly and shows a separate result, so the original remains available while you review the changes.

1. Paste a CSS snippet or stylesheet into the input field. The counter shows the current line and character count.
2. Choose two spaces, four spaces, or tabs for nested rules.
3. Select Format CSS to add readable indentation, or choose Minify CSS to collapse formatting whitespace.
4. Copy the output or download it as formatted.css. Compare the result with your project before replacing a source file.

You can also select Remove ordinary comments. By default, comments remain in place; comments beginning with /*! are preserved even when ordinary comments are removed. This makes the default suitable for reviewing source where notes or license notices matter.

Example: Format a Compressed CSS Rule

.card{color:var(--ink);padding:1rem}.card:hover{box-shadow:0 2px 8px #0002}

.card {
  color: var(--ink);
  padding: 1rem;
}

.card:hover {
  box-shadow: 0 2px 8px #0002;
}

The formatter adds line breaks between rule blocks and places declarations on separate lines. It keeps selectors, property values, and rule order in the text; it does not decide whether the selected values produce the design you intended.

CSS Formatter vs. Minifier vs. Validator

These operations answer different questions. Formatting changes layout for people reading source. Minification removes some presentation whitespace for a smaller text file. Validation checks a stylesheet against CSS rules and browser support requirements.

The formatter reports structural errors that stop it from reading the input reliably, such as an unclosed block or quoted string. That feedback is narrower than standards validation. When conformance matters, use the W3C CSS Validation Service and test the page in the browsers your project supports.

What This CSS Beautifier Changes and Preserves

A CSS beautifier should make source easier to inspect without silently reordering the cascade. This tool adds indentation and line breaks around rules and declarations. The input order is kept, so declarations later in the stylesheet stay later in the output.

• Selectors and at-rules: common selectors, grouped selectors, @media, @supports, and keyframe blocks are arranged as nested rules.
• Values and strings: Format keeps value text and quoted strings as entered. Minify collapses ordinary formatting whitespace outside strings and nested functions; custom-property values are kept as entered.
• Comments: comments are retained by default. You can remove ordinary comments for a smaller output; /*! ... */ notices remain.
• Indentation: choose two spaces, four spaces, or tabs to match the stylesheet you are reviewing.

Formatting is a source-reading aid, not an optimizer. Format mode changes layout while preserving value text. Minify mode collapses ordinary formatting whitespace; review custom tokens and test the result before using it. Neither mode sorts declarations, combines selectors, renames variables, adds vendor prefixes, rewrites colors, or removes unused CSS.

For the CSS language itself, see the MDN CSS reference. It describes CSS syntax and browser features; the online CSS formatter simply helps make the current source easier to inspect.

CSS Formatter Limits and Privacy

Formatting, minifying, copying, and downloading run in this browser page. The tool does not upload CSS to an API or store it in an account. The page itself still needs an internet connection to load the site. Avoid entering secrets or private source into any online service unless your organization permits that workflow.

The input limit is 250,000 characters. A very large stylesheet can consume browser memory or make the tab slow; for a complete project, use a local formatter with a checked-in configuration. This page is intended for CSS rather than SCSS, Sass, Less, CSS-in-JS, or framework templates. Shared tokens may still be rearranged, but the tool does not compile those dialects.

Before using minified output in production, compare the rule order and test the page in supported browsers. Keep a copy of the original. If a custom property contains unusual token streams or your build system has special syntax, prefer that project's own formatter and minifier.

Related Browser-Based Developer Tools

Choose the tool that matches the source you need to inspect. Use the HTML formatter for markup indentation and the JSON formatter to format and syntax-check JSON. To write and preview a small web page, open the online HTML compiler.