Code Beautifier
Format and auto-indent HTML, CSS, and JavaScript code in one click
What is Code Beautifier?
When you inherit a legacy codebase, copy code from Stack Overflow, or receive minified source files from a third party, the first challenge is often just making it readable. Poorly indented HTML, collapsed CSS rules, and inconsistently spaced JavaScript are harder to review, debug, and maintain. Our free Code Beautifier restores proper formatting to HTML, CSS, and JavaScript files in a single click. It applies consistent indentation (2 or 4 spaces), adds line breaks between rules and blocks, aligns opening and closing tags, and organises code so that its structure is immediately clear. Unlike a simple whitespace adder, the beautifier understands the syntax of each language — it knows that a closing CSS brace should be on its own line, that HTML attributes should wrap consistently, and that JavaScript function bodies need proper indentation depth. The result is code that follows modern formatting conventions, is easier to read in code reviews, and can be dropped directly into a codebase without triggering linter warnings for style issues.
How to Use Code Beautifier
- 1
Select the Language
Choose HTML, CSS, or JavaScript from the selector. Each language has its own formatting rules — bracket placement, indentation style, attribute wrapping — applied automatically.
- 2
Paste Your Code
Paste any HTML markup, CSS stylesheet, or JavaScript file — no matter how compressed, inconsistently indented, or poorly formatted it is.
- 3
Copy the Beautified Output
The formatted code appears instantly. Copy it to your clipboard or download it as a file to replace the original in your project.
Use Cases
Making Minified Third-Party Code Readable
Vendor scripts and bundled CSS from npm packages or CDN links arrive minified. When you need to audit what a third-party script does, inspect a CSS framework's rule structure, or debug an animation, paste the minified code here to restore it to a readable, browsable format before opening it in your editor.
Cleaning Up Copy-Pasted HTML
HTML copied from a CMS, email template tool, or design handoff rarely has consistent indentation. Before adding it to your codebase or sending it for code review, beautify it to catch mismatched tags, spot accidentally duplicated sections, and ensure it follows your team's formatting conventions.
Preparing Code for Documentation
When writing documentation, blog posts, or tutorials, code samples need to be clean and consistently formatted. Paste your raw snippet here to auto-format it before dropping it into your Markdown file or documentation platform.
Features
Three Languages in One Tool
Beautify HTML, CSS, and JavaScript without switching between tools. Each language uses the appropriate formatting rules for its syntax.
Consistent Indentation
Applies uniform 2-space or 4-space indentation throughout the file, fixing mixed tabs and spaces — one of the most common source of linter errors.
Preserves Code Logic
Formatting only affects whitespace and line breaks — the code's actual behaviour, variable names, and logic are never altered.
Instant Results
Beautification runs in your browser using js-beautify. No server round-trip means results appear in under a second regardless of file size.
Frequently Asked Questions
A beautifier only changes formatting — whitespace, indentation, and line breaks — without altering the code's logic or flagging logical errors. A linter (like ESLint or Stylelint) checks for logical problems, potential bugs, and rule violations in addition to style. Beautifiers and linters are complementary: beautify first, then lint. Many projects use Prettier for automated beautification in their workflow.
No. Whitespace and indentation have no effect on JavaScript's runtime behaviour. The V8 engine (Chrome/Node) strips formatting during parsing. The only exception is strings that intentionally contain spaces or newlines — but a proper beautifier preserves the content of string literals exactly as written.
The tool defaults to 2-space indentation, which is the standard in most JavaScript/TypeScript projects and is enforced by Prettier's defaults. This matches the conventions of popular style guides including Google's JavaScript Style Guide and the Airbnb Style Guide.
For one-off formatting of individual files, yes. For ongoing workflow integration — formatting on save, enforcing consistent style across a team, running in CI — use Prettier, ESLint, or your IDE's built-in formatter. This tool is best for quick manual formatting needs where setting up a full toolchain is overkill.
Some HTML formatting edge cases depend on context: inline elements like <span> and <a> should not have line breaks inserted inside them as that adds whitespace nodes to the DOM. The beautifier follows standard rules but may occasionally place line breaks differently than your team's convention. For project-wide HTML formatting, consider using Prettier with its HTML plugin.
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