Free Online HTML Formatter & Beautifier

HTML Formatter & Beautifier: Core Features and Principles

When dealing with minified, messy, or inconsistently styled HTML code, readability and team efficiency drop significantly. This tool visually reconstructs your source code by parsing the HTML Document Object Model (DOM) structure and applying your specified formatting rules (such as indentation, line breaks, and brace styles). The result is a cleanly structured, uniformly formatted, and easily maintainable HTML document. HTML formatting and beautification is the process of converting code from a "machine-optimized" state to a "human-readable" state by adjusting spaces, line breaks, and indentation levels without altering the code's logical semantics.

Why Choose Our HTML Formatter & Beautifier?

• Supports Standard Indentation Styles: Flexibly choose between tabs or a specific number of spaces (e.g., 2 or 4 spaces) for indentation to match different project or team coding standards.
• Precise Line Wrap and Width Control: Configure whether to preserve original line breaks, set automatic line wrap thresholds, and apply specific line break strategies for certain elements (like long attributes) to ensure a visually appealing code layout.
• Dedicated to HTML Structure: Primarily optimizes the visual presentation of HTML tags, attributes, and nested structures, while maintaining basic formatting for inline <style> and <script> tags to ensure a consistent document style.

How to Use the Tool

1. Paste or type the HTML code you want to format into the "Before" input box.
2. In the right-hand configuration panel, set your preferences for "Indentation," "Preserve Line Breaks," "Brace Style," and other options.
3. Click the "Beautify" button or view the real-time formatted code in the "After" area.
4. Use the "Copy" button to instantly grab the beautified code, or click "Clear" to start a new formatting task.

Frequently Asked Questions (FAQ)

Q: Will the beautified code affect my webpage's functionality?
No. Formatting only adjusts the visual layout of the code (spaces, line breaks, indentation) and does not modify the logic or content of any HTML, CSS, or JavaScript.

Q: What inputs does the HTML beautifier support?
It supports standard HTML5 code, including nested tags, inline styles, and scripts. For highly irregular or erroneous code, the parser may not correctly identify the structure, so it is recommended to ensure your code is fundamentally valid first.

Important Notes

Please ensure that the input HTML code structure is fundamentally complete and valid for the best formatting results. This tool primarily optimizes HTML structure. For extreme beautification of complex CSS/JS code inside <style> and <script> tags, we recommend using dedicated tools. Processing very large files may require a brief wait. Before copying the results, we suggest taking a quick look at the formatted code to ensure it meets your expected style.

Technical Notes & Best Practices

For collaborative team projects, it is recommended to standardize formatting configurations and document them. For example, Vue/React projects often use 2-space indentation to save horizontal space, while traditional enterprise-level web projects might stick to 4 spaces. A typical example: formatting the minified HTML snippet <div><p>Hello</p></div> using 2-space indentation and an "end-of-line" brace style will result in:
<div>
  <p>
    Hello
  </p>
</div>. This significantly improves the readability of nested hierarchies.