Util Hub.io

Code Beautifier

Format and beautify HTML, CSS, and JavaScript. Expand minified files, fix indentation, copy in one click.

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Free Online Code Beautifier — HTML, CSS & JavaScript Formatter

Turn messy or minified HTML, CSS, and JavaScript into clean, properly indented code in one click. UtilHub's code beautifier auto-detects the language, expands single-line vendor bundles into readable multi-line output, and lets you pick 2 spaces, 4 spaces, or tabs to match your project's style guide. Logic, comments, and string contents are preserved exactly — only whitespace is normalised. Perfect for inspecting minified production code, cleaning up inherited files before a code review, or pasting copy-from-DevTools snippets into a readable editor. Runs locally in your browser — no upload, no signup, unlike ad-heavy alternatives.

How to use Code Beautifier

  • Paste your HTML, CSS, or JavaScript code into the input panel.
  • Pick the language manually or let auto-detect choose.
  • Choose indentation: 2 spaces, 4 spaces, or tab.
  • Click "Format" — the beautified result appears in the output panel.
  • Click "Copy" to send the clean code to your clipboard.

Features

  • Multi-language support — Beautify HTML, CSS, and JavaScript in a single tool. Auto-detects language or lets you specify manually.
  • Customizable indentation — Choose between 2 spaces, 4 spaces, or tabs. Match your project's code style guide effortlessly.
  • Minified code handling — Expands single-line minified files into properly formatted, multi-line code with correct nesting.
  • Preserves functionality — Only changes whitespace and formatting. Your code logic, comments, and strings remain completely untouched.

Frequently Asked Questions

Does the beautifier change my code logic or just the formatting?

Only the formatting. The tool adjusts indentation, line breaks, and whitespace. It never modifies your code logic, variable names, comments, or string contents. What goes in and what comes out are functionally identical — just formatted differently, so diffs and runtime behaviour are unchanged.

Can I beautify minified JavaScript?

Yes. Paste a single-line minified JS file and the beautifier expands it into properly indented, readable code with correct line breaks. Especially useful for debugging vendor libraries, inspecting production bundles, or understanding obfuscated source you pulled from DevTools.

What indentation should I use — 2 spaces, 4 spaces, or tabs?

It depends on language and team. JavaScript, TypeScript, and JSX commonly use 2 spaces (Prettier default). HTML and CSS also commonly use 2 spaces. Python and many Java/C# codebases use 4 spaces. Tabs are preferred by some teams for accessibility (each developer sets their own visual width). Match your existing codebase to keep git diffs clean — switching mid-project produces large noisy diffs.