CSS Formatter & Beautifier - Beautify CSS Online Free

About the CSS Formatter playground

The CSS Formatter beautifies compact or messy stylesheets into clean, consistently indented rules. It places each declaration on its own line, normalizes spacing around braces, colons, and semicolons, and indents nested at-rules like media queries. The tool processes everything locally in your browser, so your styles are never uploaded, making it safe for proprietary design systems and internal component libraries.

CSS (Cascading Style Sheets) describes how HTML elements are presented, controlling layout, color, typography, and responsive behavior. Stylesheets are often shipped minified for performance, which makes them nearly impossible to read. Reformatting CSS restores structure so you can inspect selectors, compare rules, and understand the cascade. Clean formatting also reduces merge conflicts and makes code review of visual changes far more reliable.

HostedCSS Formatter runtime

mainentry file

single fileworkspace

stdinprogram input

How it works

Write

The main file is the entry point for each run.

Give it input

Use the Input panel to pipe standard input to your program when it needs data.

Run

Run sends your code to a fresh hosted runtime and streams the result into the output panel.

Keep or share

Your draft stays in this browser, and Share creates a separate snapshot link.

External resources

w3.org/Style/CSS— Official website

Messy input

.btn{color:#fff;background:#0070f3;padding:8px 16px;border:none}.btn:hover{background:#0059c1}

Formatted output

.btn {
  color: #fff;
  background: #0070f3;
  padding: 8px 16px;
  border: none;
}

.btn:hover {
  background: #0059c1;
}

Media query formatted

@media (max-width: 600px) {
  .container {
    flex-direction: column;
    padding: 1rem;
  }
}

Flexbox layout formatted

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.row > .item {
  flex: 1 1 auto;
}

Grid with variables formatted

:root {
  --cols: 3;
  --gap: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(var(--cols), 1fr);
  gap: var(--gap);
}

Keyframes animation formatted

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal {
  animation: fade-in 0.3s ease-out;
}

Selector list messy input

h1,h2,h3{margin:0;font-weight:600}a:hover,a:focus{color:#0070f3}

Selector list formatted output

h1,
h2,
h3 {
  margin: 0;
  font-weight: 600;
}

a:hover,
a:focus {
  color: #0070f3;
}

Nested at-rule formatted

@supports (display: grid) {
  @media (min-width: 768px) {
    .layout {
      display: grid;
      grid-template-columns: 200px 1fr;
    }
  }
}

Input

Output

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CSS Formatter

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