#225 · Formatters & Data Text Tool

HTML Formatter

Format messy HTML into a readable structure with indentation, tag statistics, DOM depth checks, accessibility hints, duplicate ID detection, and semantic HTML scoring.

Text Input

HTML formatting options
spaces

Recent History

No history yet.
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How to use this text tool

  • Paste HTML markup into the input box.
  • Choose indentation and attribute behavior.
  • Run accessibility checks for missing alt text or duplicate IDs.
  • Format the HTML and review the structure metrics.

What this tool does

This HTML formatter helps developers inspect document structure, nested tags, links, images, forms, headings, and accessibility issues before publishing code.

Processing logic: detect opening, closing, and void tags; indent nested elements; preserve text and comments; and run lightweight structural checks.

The formatter does not replace a full HTML validator, but it quickly reveals structure and readability issues.

Example

Try the sample input, run format html, and compare the before-and-after structure in the result panel.

Use cases

  • Clean code before review or sharing.
  • Prepare structured text for documentation, snippets, or production workflows.
  • Check size, line count, structure, and quality before exporting.

Tips for better output

  • Use semantic tags such as header, main, section, article, and footer.
  • Add alt text to meaningful images.
  • Reduce deep nesting when possible.

Processing details

Processing logic: detect opening, closing, and void tags; indent nested elements; preserve text and comments; and run lightweight structural checks.

The formatter does not replace a full HTML validator, but it quickly reveals structure and readability issues.

FAQ

How do I format HTML automatically online?

Paste HTML into the formatter, choose indentation, and run the tool to split nested tags into a readable hierarchy.

Why is HTML indentation important for debugging?

Indentation shows parent-child relationships, making missing closing tags, deep nesting, and misplaced elements easier to spot.

Can an HTML formatter fix broken HTML?

It can improve readability and reveal likely issues, but malformed markup should still be checked with a validator.

How do I find missing image alt attributes in HTML?

Run the formatter with accessibility checks enabled to count image tags and flag images without alt attributes.

Does formatting HTML improve website performance?

Formatting itself usually increases file size slightly, but it improves editing. Use an HTML minifier for production performance.

Tool modules

ModulePurpose
Input parserReads pasted text, uploaded files, or sample data.
Processing engineApplies formatting, minification, generation, or cleanup logic.
Quality reportShows statistics, quality score, and practical recommendations.
Export toolsSupports copy, TXT, CSV, JSON, print, history, undo, and redo.

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