CSS Formatter

• 100% Free

  Core tools stay free with no paywall to unlock basics.

• No Registration Required

  Open a tool and start immediately - no account needed.

• Privacy First

  We avoid unnecessary collection and keep processing local when possible.

• Browser Processing

  Most tools run in your browser so your input never needs a server round-trip.

• Fast & Secure

  HTTPS everywhere with instant, client-side results for everyday tasks.

• Mobile Friendly

  Layouts and controls are built for phones, tablets, and desktops.

• Updated Regularly

  Tools and content are improved continuously as the platform grows.

Key Features

• Rule-Aware Formatting

  Splits selectors, declaration blocks, and individual properties onto their own lines by tracking braces and semicolons, not just existing whitespace.

• String & Comment Safe

  Leaves quoted values like font-family names and url() strings untouched, and understands /* */ comments so they never get mangled mid-rule.

• Whitespace-Smart Minify

  Collapses spacing between selectors and declarations while keeping the single space required between tokens like "1px solid", so minified CSS still parses correctly.

• Browser-Local Processing

  Formats and minifies entirely on-device, so proprietary design-system stylesheets never touch a server.

How to Use

1. 1

   Paste your CSS

   Copy a stylesheet, a component style block, or a compiled bundle from your build output.

2. 2

   Choose Format or Minify

   Format expands rules with one declaration per line; Minify collapses everything into a compact, production-ready string.

3. 3

   Scan the readable output

   Check that selectors, nested media queries, and property values line up the way you expect.

4. 4

   Copy or download the result

   Copy to your clipboard for a quick paste, or download a .css file to drop straight into your project.

Use Cases

• Reviewing minified vendor stylesheets

  Third-party widgets and CDN-hosted CSS frameworks often ship minified - expand them to inspect specificity before overriding a rule.

• Cleaning up compiled Sass or Less output

  Preprocessor build output can be dense; reformat it to trace which source partial produced a given rule during debugging.

• Preparing style examples for documentation

  Format snippets pulled from a design system or style guide so they read cleanly in a blog post or internal wiki page.

• Shrinking hand-written CSS before shipping

  Minify small, hand-authored stylesheets for static sites and landing pages that do not run through a bundler like PostCSS.

Examples

.btn{display: inline-flex; align-items: center; padding: 8px 16px; border-radius: 6px}.btn:hover{opacity: .9}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: 6px
}
.btn:hover {
  opacity: .9
}

/* card shadow */
.card {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  border: 1px solid #e5e5e5;
}

.card{box-shadow:0 1px 3px rgba(0,0,0,0.1);border:1px solid #e5e5e5;}

Benefits

• ✓Expands minified vendor and CDN stylesheets so you can safely override specific rules
• ✓Shrinks hand-written CSS for faster page loads without introducing a build step
• ✓Keeps quoted strings, url() values, and comments intact instead of corrupting them
• ✓Makes nested media queries and pseudo-class rules easy to scan during code review
• ✓Processes everything client-side, so internal design-system files stay private

Best Practices

• Format vendor CSS before editing it so you can see full selector specificity and existing overrides.
• Keep an unminified, version-controlled copy of your stylesheet and only minify the build artifact you deploy.
• Check media query blocks after formatting to confirm breakpoints nested correctly inside the outer braces.
• Re-run your visual tests after minifying - value-preserving minification is safe, but always verify rendering.

Common Mistakes

• Minifying CSS as the first step, which makes it much harder to spot a missing semicolon or unclosed brace.
• Expecting the tool to flag invalid property names or values - it formats structure, it does not lint CSS syntax.
• Manually removing spaces inside shorthand values like "1px solid #000", which can break parsing in some contexts.

Privacy Notice

Formatting and minifying both run entirely in your browser using JavaScript. Your stylesheets, including internal design-system files or client work, are never uploaded to or stored on ToolMint servers.

About This Tool

Frequently Asked Questions

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