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HTML Formatter

Beautify unformatted HTML with clean indentation, consistent spacing, and strict structure preservation.

Shortcuts: Ctrl+Enter (Cmd+Enter) to format instantly.

How to Use the HTML Formatter

  1. Paste your minified or unformatted HTML into the Raw HTML Input editor.
  2. Select your preferred indentation width (2 spaces, 4 spaces, or Tabs).
  3. Click Format HTML or press Ctrl+Enter.
  4. Copy the formatted HTML with the Copy Output button or download it directly as a .html file.
100% Client-Side Privacy: Your data is processed locally in your browser and is not uploaded to our servers.

Online HTML Formatter: Beautify, Indent & Clean HTML Code

The Todoal HTML Formatter is a powerful in-browser markup beautifier engineered to format unindented, compressed, or minified HTML documents into clean, human-readable DOM structures. When inspecting web page source code, extracting email newsletter templates, or debugging server-side rendered HTML, nested tags without proper indentation are difficult to read and error-prone to edit. This tool restructures raw HTML with customizable indentation spacing (2 spaces, 4 spaces, or tabs) while preserving standard self-closing tags and inline element semantics.

Unlike basic regex replacers that break inside embedded scripts or styles, our parser protects content within <script>, <style>, and <pre> blocks. It also properly respects HTML5 void tags (such as <img>, <input>, <br>, and <meta>) to prevent invalid closing tags from being generated.

Smart DOM Nesting & Void Tag Handling

Maintains proper tree indentation across deeply nested HTML structures while correctly identifying void and self-closing tags without creating spurious closing elements.

Embedded Script & Style Protection

Tokenizes and protects embedded JavaScript logic and CSS style declarations inside HTML documents, ensuring internal code formatting and string quotes remain untouched.

One-Click Download & Instant Copy

Download beautified markup directly as a clean .html file or copy formatted code to your clipboard with keyboard shortcuts (Ctrl+Enter).

100% Client-Side In-Browser Processing

All HTML formatting runs directly in your local browser memory. No source code or proprietary web templates are ever transmitted to remote servers.

Integrated Web Markup & Developer Tool Ecosystem

Combine HTML formatting with live visual inspection: preview formatted markup instantly in our isolated HTML Previewer or compress production HTML payloads with the HTML Minifier. If you work with entity-encoded strings in API responses, decode special HTML characters with the HTML Decoder or sanitize raw text with the HTML Encoder.

For stylesheet and script optimization, format stylesheets using the CSS Formatter, minify CSS with the CSS Minifier, format JavaScript with the JavaScript Formatter, and test XML documents using the XML Formatter. Explore all developer tools in the Developer Tools Suite.

Best Practices for Writing Maintainable Semantic HTML

  1. Use Semantic Tags: Prefer <header>, <nav>, <main>, and <footer> over generic <div> containers for accessibility and SEO.
  2. Standardize Indentation: Use 2 spaces for modern web frameworks and component templates to maintain clean git version control diffs.
  3. Attribute Formatting: Keep element attributes organized logically (id, class, accessibility aria-*, and data attributes).
  4. Minify for Production: Format HTML during authoring and review, but minify HTML assets before production deployment to reduce bandwidth.
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Frequently Asked Questions

Everything you need to know about this browser tool and privacy.

How does this HTML formatter indent nested elements?
The formatter parses the HTML document token by token, tracking parent and child block boundaries, while preserving void elements (like <img>, <br>, <meta>), doctypes, and comments. It indents nested structures by your chosen indentation width (2 spaces, 4 spaces, or Tabs).
Does this formatter execute scripts or render HTML?
No. The formatting engine operates as a purely static character parser. It never executes <script> tags or parses DOM elements in an executable browser context.
Are preformatted tags like <pre> and <textarea> preserved?
Yes. Content inside <pre>, <textarea>, and <script> tags preserves exact internal whitespace without intrusive reformatting.
Is my HTML source code sent to a server?
No. All formatting logic runs 100% locally in your browser's memory with zero server uploads or external network requests.
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