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BunchTool — HTML Prettifier & Indenter
Minified Samples:
📝 Messy or Minified HTML Input
✨ Formatted & Indented HTML Output
Lines: 0 | Total Size: 0 B | Mode: 2 Spaces
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HTML Prettifier & Indenter —
Format & Un-minify HTML Markup Online

Our free HTML Prettifier & Indenter provides an interactive solution to clean up messy HTML5 markup, un-minify dense single-line web templates, and structure nested DOM nodes with clean, professional indentation. Choose your preferred indentation spacing—including 2 Spaces, 4 Spaces, or Tab (\t). Perfect for web developers, code reviewers, and students, the tool handles void self-closing tags (``, `
`, ``) seamlessly. Operating 100% client-side in secure local JavaScript, your HTML code is processed instantly inside your browser without any server uploads.

Clean HTML tag indentation with customizable 2-Space, 4-Space, or Tab (\t) modes
Un-minify dense single-line HTML code blocks into readable hierarchical structures
Supports void self-closing tags (<img />, <br>, <input>, <meta>)
Upload local .html files and download formatted pretty.html directly
🎨
Clean IndentDOM Formatter
2 / 4 / TabSpacing Modes
100% PrivateBrowser Computed
How It Works

Prettify HTML Markup in three steps

Step 1
📝
Paste HTML or Upload File

Paste your messy or single-line HTML markup into the editor, click a minified sample preset, or upload a local .html file.

Step 2
⚙️
Choose Spacing & Options

Select your preferred indentation size (2 Spaces, 4 Spaces, or Tab) and click 'Prettify HTML'.

Step 3
📋
Copy or Download Formatted HTML

Inspect the line count and byte size metrics, then copy the indented HTML code or download pretty.html.

Why BunchTool

Why use our free HTML Prettifier & Indenter?

🎨
Smart DOM Tag Tokenization

Parses HTML elements, tracks indentation depth, and correctly formats nested tags without disrupting void self-closing elements.

⚙️
Customizable Indentation Guidelines

Choose between 2 Spaces, 4 Spaces, or Tab (\t) characters to seamlessly conform to your project's styling conventions.

🔒
100% Private In-Browser Processing

All HTML parsing, tag indentation, and file downloads execute locally in your browser. No files or code blocks are ever transmitted to external servers.

FAQ

Frequently asked questions

What does an HTML Prettifier do? ▼
An HTML Prettifier (or code indenter) parses raw, messy, or single-line minified HTML markup and formats it into clean, hierarchically indented structures with proper line breaks between nested tags.
How does the indenter handle self-closing tags like <img />, <br>, and <input>? ▼
The formatting engine automatically recognizes standard W3C void tags (such as <img />, <br>, <hr>, <input>, <meta>, and <link>) and avoids increasing nested indentation depth for them.
Can I choose between 2-space, 4-space, or tab indentation? ▼
Yes. Code parsing, minification, and syntax formatting for the Html Prettifier run entirely inside your local browser engine. No source code or markup is transmitted to remote servers.
Will prettifying HTML break my web layout or functionality? ▼
No. Safe HTML formatting preserves all DOM node tags, attributes, and inline script content while only adjusting white space for visual code readability.
Does the HTML Prettifier send my HTML markup to any external server? ▼
No. All HTML parsing, tag indentation, and file downloads execute 100% locally inside your web browser using client-side JavaScript.
Detailed Guide

Understanding HTML AST Tokenization, Void Tag Parsing & Indentation Hierarchy

An HTML Prettifier (Beautifier) tokenizes raw markup strings into structural DOM nodes, calculating nesting depth to insert uniform whitespace line breaks between parent elements and child tags.

The parser identifies standard W3C void HTML tags (<img>, <input>, <br>, <hr>, <meta>, <link>) or self-closing XML tags (/>) to prevent incorrect indentation level increments.

Formatting code with clean 2-space or 4-space indentation drastically improves codebase maintainability, peer code review productivity, and Git diff readability without affecting runtime browser rendering behavior.

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