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UFOZoo

Code Beautifier: Format HTML, CSS & JavaScript Online

Code beautifier online: format HTML, CSS, and JavaScript with indentation, line breaks, and configurable style rules for clean readable code.

Updated 2026-08-16

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Features

  • Format and beautify HTML, CSS, and JavaScript in one unified tool: no need to switch between sites
  • Automatic language detection: paste any code and the tool identifies HTML, CSS, or JS instantly
  • Configurable indentation: choose between 2 spaces, 4 spaces, or tab characters for output formatting
  • Preserve or remove comments: keep documentation comments for readability or strip them for clean output
  • Sort CSS properties alphabetically: optional property ordering for consistent, organized CSS files
  • Format HTML attributes: align attributes on separate lines or keep them inline for compact output
  • Real-time formatting: see beautified output as you type, no button clicks needed
  • Side-by-side comparison: compare original minified code with beautified output
  • One-click copy to clipboard and save as .html, .css, or .js file
  • Syntax-aware formatting: respects string literals, comments, and nested structures
  • Handles large files: browser-native processing with no file size limits

How to Use

  1. 1Paste your minified or poorly formatted HTML, CSS, or JavaScript code into the input panel
  2. 2The tool auto-detects the language and starts formatting immediately as you type
  3. 3Select indentation style: 2 spaces for compact code, 4 spaces for readability, or tabs
  4. 4Toggle 'Remove Comments' to strip comments for a cleaner output, or keep them for reference
  5. 5Toggle 'Sort CSS Properties' when formatting CSS to alphabetically order properties within rules
  6. 6Toggle 'Format HTML Attributes' to place each HTML attribute on its own line for better readability
  7. 7Compare the original and beautified code side-by-side in the split view
  8. 8Click 'Copy' to paste the formatted code into your editor, or 'Save' to download as a file
  9. 9Use the sample buttons to quickly test formatting with example HTML, CSS, and JavaScript code

Frequently Asked Questions

What languages are supported?

The tool supports HTML (including embedded CSS and JavaScript), CSS (including SCSS and Less syntax), and JavaScript (including ES6+ features, JSX, and TypeScript). Each language uses its own formatting rules for optimal results.

How does auto-detection work?

The tool analyzes the code structure, looking for HTML tags, CSS selectors/properties, or JavaScript syntax patterns. It identifies the most likely language and formats accordingly. If detection is wrong, you can manually select the language.

What's the difference between 2 spaces and 4 spaces?

2 spaces produces more compact code, popular in modern JavaScript projects and frameworks like React. 4 spaces is traditional for HTML and CSS, providing more visual nesting clarity. Choose based on your project's style guide.

Will formatting change my code's functionality?

No. The formatter only adds, removes, or repositions whitespace and line breaks. It does not change variable names, logic, or any functional code. The beautified code produces exactly the same output as the original.

Does it handle minified code?

Yes. The tool excels at formatting minified code: single-line HTML, compressed CSS, or bundled JavaScript. It restores proper indentation and line breaks, making minified code readable again for debugging or learning.

Can I use this for SCSS or TypeScript?

Yes. CSS mode handles SCSS, Less, and other CSS preprocessors. JavaScript mode handles TypeScript, JSX, and modern ES6+ syntax including arrow functions, template literals, destructuring, and async/await.

How do I beautify code in VS Code instead?

VS Code formats on demand with Shift+Alt+F (Format Document) using its built-in formatters, and extensions like Prettier add configurable rules for HTML, CSS, JS, and many other languages. This browser tool is convenient for one-off formatting, pasted snippets, or when you cannot install extensions; the results are equivalent for the supported languages.

Is there a downloadable version of this tool?

No download or installation is needed; it is a web page. All formatting logic ships with the page and runs in your browser, so once loaded it also works offline. Bookmark the page and it behaves like a local app without any install.

Does it work on mobile?

Yes, but the experience is better on desktop. On mobile, the input/output panels stack vertically. You can still paste code, adjust formatting options, and copy or save the result. Landscape mode on tablets provides more comfortable editing.

How does comment removal work?

When enabled, the tool strips HTML comments (<!-- -->), JavaScript comments (// and /* */), and CSS comments (/* */) from the output. This is useful for production code where comments aren't needed. Toggle it off to preserve all comments.

What about CSS property sorting?

When enabled, CSS properties within each rule are sorted alphabetically. This creates consistent, predictable CSS files and makes it easier to find specific properties. It follows the CSSComb standard ordering.

Why does my code break or behave differently after formatting?

Formatting only rewrites whitespace and line breaks, so logic should never change; when it does, the usual culprits are: wrong language detection (a .jsx or .tsx file formatted as plain JavaScript can misplace syntax), template literals or regex literals containing characters the formatter reflows, and pre-ES6 code with unusual constructs. Check which language is selected before formatting, and if a specific construct breaks, format around it manually. If your code was minified, format it first and inspect the result before relying on it.

Can I format JSON, XML, Python, or Java with this tool?

No. This tool covers HTML, CSS and JavaScript only; pasting other languages can produce misleading output. For JSON, run JSON.stringify(data, null, 2) in any browser console or use a JSON formatter. For XML use a dedicated XML formatter, for Python use black or autopep8, and for Java use google-java-format. The 2-space/4-space/tab indentation you choose here matches what those tools emit by default.

How large a file can I format in one go?

There is no hard limit; formatting runs entirely in your browser, so the practical ceiling is your device's memory. Multi-megabyte files usually work but may take a moment to reflow; if the page becomes sluggish, format the file in sections, or switch to a command-line tool such as prettier (npx prettier --write file.js) for very large codebases.

After formatting, the diff shows the whole file changed: how do I know the logic is intact?

For minified or badly indented input, a huge diff is expected: the formatter rewrites every line break and indent, so most changes are whitespace. To check semantics, run git diff -w (ignores whitespace): the real diff should be near zero, or run the project's tests or build after formatting. If the code was already clean, the diff should be tiny; a large diff there is the signal to check whether the language was detected correctly.

I accidentally overwrote my original code in the input panel: can I get it back?

There is no undo button and nothing is written to disk. The original text only survives until you replace it, so if you pasted over it, it is gone from this page. Practical recovery: if you loaded it from a file, the file on disk is untouched: reopen it; if you copied it from an editor, undo there. Going forward, keep the original in the source panel until the formatted result is verified, and use the copy button instead of selecting and typing over the input.