HTML Formatter
Format and beautify HTML code with proper indentation, tag validation, and error highlighting in real-time. Perfect for code readability, debugging, and clean markup generation with customizable formatting options and minification support.
Continue Your Code Journey
What is HTML Formatter?
The HTML Formatter takes messy or minified HTML and reformats it with consistent indentation and line breaks. It parses the structure, inserts newlines between tags, and adds indentation based on nesting depth. The tool preserves all attributes, content, and functionality, changing only whitespace. All processing happens in the browser.
How does HTML Formatter work?
This tool tokenizes HTML into tags and text nodes, then reconstructs the document with proper formatting. It adds a newline before each opening and closing tag and indents based on the current nesting level. Self-closing tags and void elements (br, hr, img, input) are handled correctly. Embedded style and script blocks are preserved as-is.
Key Features
- Formats minified or messy HTML with proper indentation
- Configurable indent size (spaces or tabs)
- Preserves all tags, attributes, and content
- Handles HTML5, XHTML, and legacy HTML
- Supports embedded CSS and JavaScript blocks
- Real-time formatting with instant output
- Copy formatted HTML to clipboard
- Preserves attributes, content, and embedded script blocks
Common Use Cases
Beautifying minified HTML for debugging
Expand a minified HTML file into readable code so you can trace structure and find issues.
Preparing HTML for code reviews
Format HTML before submitting a pull request so reviewers can read the structure clearly.
Cleaning up generated HTML
Reformat HTML output from a CMS or WYSIWYG editor that produces unindented code.
Learning HTML structure
Format example HTML to see how nested elements relate to each other through indentation.
How to Use This Tool
Paste HTML code
Copy and paste messy or minified HTML into the input area.
Set indent options
Choose spaces or tabs and set the indent size.
Format
Click Format. The tool reformats the HTML with proper indentation.
Copy the result
Copy the formatted HTML for use in your editor or project.
Pro Tips
- 1
Formatting only changes whitespace. It does not modify tags, attributes, or content.
- 2
Use 2-space indentation for compact output. Use 4-space for more visible nesting.
- 3
Format HTML before committing to version control for cleaner diffs.
- 4
The tool handles embedded style and script blocks without reformatting their contents.
Frequently Asked Questions
Will formatting change how my page displays?
No. HTML formatter only changes whitespace such as indentation and line breaks. The HTML elements, attributes, and content are unchanged.
Can I format minified HTML?
Yes. Paste minified HTML and the tool expands it with proper line breaks and indentation.
Does it work with HTML5?
Yes. The formatter supports HTML5, XHTML, and older HTML versions. It recognizes void elements and self-closing tags correctly.
Is my code uploaded to a server?
No. All formatting happens in your browser using JavaScript. The code never leaves your device.
Can I choose tabs instead of spaces?
Yes. The indent options let you choose between spaces (with configurable size) and tabs.
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