Unminify CSS Online — Free CSS Formatter

Unminify minified CSS instantly with our free online tool. Restore readable formatting from compressed stylesheets. All processing in your browser.

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CSS Unminification

Unminify compressed CSS online. Restore readable formatting for debugging production styles.

Features

Restore the readability of your minified CSS code by adding spaces and line breaks.

Unminify

Restore the readability of your minified CSS code by adding spaces and line breaks.

Package used

CSSO

v5.0.5

CSSO (CSS Optimizer) is a powerful tool for optimizing CSS files by removing redundancies and compressing code.

Basic example

Minified CSS

.container{margin:20px;padding:10px;background-color:#fff}.button{color:#000;font-size:16px;border:1px solid #ccc}.card{display:flex;flex-direction:column;gap:12px;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.12)}

Formatted CSS

.container {
  margin:20px;
  padding:10px;
  background-color:#fff;
}

.button {
  color:#000;
  font-size:16px;
  border:1px solid #ccc;
}

.card {
  display:flex;
  flex-direction:column;
  gap:12px;
  border-radius:8px;
  box-shadow:0 2px 8px rgba(0,0,0,.12);
}

Minification options

Beautify Options

Indentation options for Beautify and Unminify (not used by Minify)

Indentation Size

Sets the number of spaces or tabs for indentation during Beautify and Unminify

Original code

.header{color:red;padding:10px}

With 2 spaces

.header {
  color: red;
  padding: 10px;
}

With 4 spaces

.header {
    color: red;
    padding: 10px;
}

Difference

Beautify and Unminify both use the indentation controls in the toolbar. Minify ignores them.

Indentation Type

Use spaces or tabs for indentation during Beautify and Unminify

Original code

.header{color:red;padding:10px}

With spaces

.header {
  color: red;
  padding: 10px;
}

With tabs

.header {
	color: red;
	padding: 10px;
}

Difference

Spaces are more standard, tabs may be preferred according to your code conventions.

How to Unminify CSS Online

CSS unminification restores readable formatting to compressed stylesheets. Paste any minified CSS into our tool to add proper indentation, line breaks, and organize selectors. This is essential for debugging production stylesheets, reviewing third-party CSS frameworks, or understanding vendor styles.

CSS Beautifier — Formatting Your Stylesheets

Our CSS beautifier applies consistent formatting rules to your stylesheets — standardized indentation, property ordering, and clean selector formatting. Whether your CSS comes from a build process, a minifier, or another developer, beautification makes it clean and maintainable.

Frequently Asked Questions — Unminify

Everything about unminification

How do I unminify CSS?

Paste minified CSS and click Unminify. Indentation and line breaks are restored for debugging.

Need beautify instead of unminify?

For already-readable CSS, use the CSS beautifier.

Unminify

Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.

Unminify JS

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Unminify TypeScript

Unminify SCSS

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Explore other tool categories

Minify

Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.

Beautify

Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.

Conversion

Transform data between JSON, YAML, XML and CSV locally — no server uploads.

CSS preprocessors

Compile SCSS or LESS to standard CSS in the browser — pair with beautify or minify for a full stylesheet workflow.

JSON Tools

Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.

SVG Tools

Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.

DevOps & Infra

Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.

CI/CD

GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.

Logs & observability

Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.

Kubernetes

Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.

Networking / IP

CIDR, subnets, and IPv4/IPv6 helpers — in your browser.

Security & tokens

JWKS, X.509 certificates, and secrets scan — browser-local.

API & schemas

OpenAPI tools to format, validate, and lint your specs.

Encoding

Encode or decode Base64, URL components and HTML entities — client-side only.

Developer utilities

Timestamps, UUID, ULID, Nanoid, cron, passwords, regex, slugify, number bases, case, text diff, and chmod — all client-side.

Text & Markdown

Count words, build Markdown TOCs, and clean line lists — all in your browser.

AI & LLM

Token counting, pricing estimates, and context-window fit — 100% browser-local.

Serialization

Serialize and deserialize PHP data structures beside JSON workflows.