Reformat messy or minified HTML, CSS and JavaScript into clean, properly indented code that is easy to read. Paste your code, pick the language and indent style, and copy the tidy result. 100% in your browser — nothing is uploaded or stored.
🔒 Everything runs in your browser. Your input is never uploaded, logged or stored.
The Code Beautifier takes messy, minified or poorly formatted HTML, CSS and JavaScript and reformats it into clean, properly indented code that is easy to read and maintain. It automatically detects the language, protects your strings, comments and regular expressions, and lets you choose your preferred indentation — making it the perfect companion to a minifier when you need to inspect or edit compressed code.
It is part of the Performance & Code Tools group in our free SEO Toolkit, and it reverses the work of the HTML Minifier, CSS Minifier and JavaScript Minifier. Once your code is readable, estimate page weight with the Page Size Calculator or pull out above-the-fold styles with the Critical CSS Extractor. Everything runs in your browser — your input is never uploaded or stored.
Format three languages with smart defaults.
Formats HTML, CSS and JavaScript, each with its own rules.
Recognises the language automatically, or set it manually.
Choose two spaces, four spaces or tabs to match your style.
Protects strings, comments and regular expressions while formatting.
Paste, choose, copy clean code.
Drop in minified or messy HTML, CSS or JS.
Use auto-detect or choose manually.
Two spaces, four spaces or tabs.
Use the clean, formatted code.
A compressed CSS rule, beautified.
.card{margin:0;padding:.5rem 1rem;color:#fff}
.card {
margin: 0;
padding: .5rem 1rem;
color: #fff
}
A code beautifier, also called a code formatter, takes code that is minified, crammed onto one line or inconsistently indented and rewrites it with clean, predictable formatting — proper line breaks, consistent indentation and readable structure. It does not change what the code does; it only changes how it looks, making it far easier to read, review and debug. This tool formats HTML, CSS and JavaScript. It is part of the Performance & Code Tools group.
| Language | What It Formats |
|---|---|
| HTML | Nested tags with indentation, inline elements kept inline |
| CSS | Selectors, braces and one declaration per line |
| JavaScript | Statements, blocks and braces with consistent indenting |
The tool detects the language automatically from the code you paste, and you can override the choice at any time. Whichever language you use, the contents of strings, comments and regular expressions are protected so formatting never alters meaning.
Clean indentation makes code far easier to scan and understand.
Formatted code reveals structure, helping you find issues.
Turn minified production code back into something legible.
Consistent formatting helps teams read each other's code.
No. Beautifying only adds line breaks and indentation; it does not rename anything or alter logic. The contents of strings, comments and regular expressions are protected, so meaning is preserved. As always, test formatted code before deploying if it is going straight into production.
The tool looks for tell-tale patterns — tags for HTML, selectors and declarations for CSS, and keywords like function and const for JavaScript. It is accurate for typical code, but if a snippet is ambiguous you can select the language manually with one click to guarantee the right formatter is used.
It is a fast, dependency-free formatter that handles the common cases extremely well — re-indenting minified or messy code so it is readable. It does not enforce every nuanced style rule that a full build-time formatter such as Prettier applies, but for inspecting and tidying code in the browser it is quick and reliable.
No. Formatting runs locally in your browser with JavaScript. Nothing you paste is uploaded, logged or stored, so the tool is safe for proprietary code, unreleased work and confidential client projects.
Expand compressed production files to inspect them.
Format code to see its structure while fixing bugs.
Clean inconsistent indentation in hand-written code.
See how nested structures are organised.
Use the Code Beautifier with these tools from the SEO Toolkit: compress markup with the HTML Minifier, shrink stylesheets with the CSS Minifier, compress scripts with the JavaScript Minifier, estimate weight with the Page Size Calculator, extract above-the-fold CSS with the Critical CSS Extractor, and build head tags with the Meta Tag Generator.
Anyone who reads, writes or debugs code.
Everything about beautifying code.
It reformats minified or messy HTML, CSS and JavaScript into clean, properly indented code that is easy to read. It detects the language automatically, protects strings, comments and regular expressions, and lets you choose your indentation, then gives you the tidy result to copy or download.
Yes, completely. There is no cost, no sign-up and no limit on how much code you format. The tool runs entirely in your browser, so there are no server costs and nothing to pay for.
Three: HTML, CSS and JavaScript. Each has its own formatting rules — nested tags for HTML, selectors and declarations for CSS, and statements and blocks for JavaScript. The tool detects which one you have pasted, and you can also select it manually.
Yes. Formatting happens locally in your browser with JavaScript. Nothing you paste is uploaded, logged or stored, which makes the tool safe for proprietary code, unreleased work and confidential client projects.
No. It only adds line breaks and indentation to make the code readable. It does not rename anything or change logic, and it protects the contents of strings, comments and regular expressions, so the meaning and behaviour stay exactly the same.
The tool looks for characteristic patterns: angle-bracket tags suggest HTML, selectors with declarations suggest CSS, and keywords such as function and const suggest JavaScript. It is reliable for typical code, and you can override it with one click if a snippet is ambiguous.
Yes. That is one of its main uses. Paste minified HTML, CSS or JavaScript and it expands the single line back into readable, indented code so you can inspect or edit it. Note that names shortened by an aggressive minifier cannot be restored, only the formatting.
Yes. You can format with two spaces, four spaces or tab indentation, so the output matches your project's coding style. The setting applies instantly and you can switch between them at any time to compare.
It is a fast, dependency-free formatter that handles common cases very well, which is ideal for inspecting and tidying code in the browser. A full build-time formatter such as Prettier enforces more detailed style rules, but needs installation and a build step.
Yes. Before formatting, the tool isolates strings, template literals, comments and regular expressions so their contents are never touched. This prevents the common mistake of breaking code that contains braces, semicolons or slashes inside a string or regex.
Yes. The beautifier is fully responsive, so you can format code from a phone or tablet. Pasting code, choosing the language and indentation, and copying the output all work the same as on desktop.
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Turn minified or messy HTML, CSS and JavaScript into clean, readable code in seconds — free, private and instant in your browser.
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