HTML Formatter

A fast HTML formatter for developers, editors, and educators to produce clean, consistent markup from messy input.

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We're working hard to get this tool ready for you.

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904+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how HTML Formatter processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

The HTML formatter converts noisy markup into a clean, readable form while preserving document structure. It is intended for developers, content teams, and educators who need consistently formatted HTML across code reviews, tutorials, and deployment pipelines.
Conceptually, the tool parses HTML with a tolerant parser, builds an internal representation, and serializes it using a configurable formatting profile. It enforces stable indentation, logical line breaks, and deterministic attribute placement without altering semantics or content.
Value highlights include improved readability, easier diffing in version control, and faster onboarding for newcomers. It handles common constructs such as comments, doctype, and void elements, and supports optional attribute wrapping or sorting for stricter style guides.
Use cases span frontend development, CMS content preparation, education materials, and automation workflows. The output is a plain string suitable for copy-paste, embedding in templates, or further processing in pipelines.

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How to Use

Paste HTML into the input.
Choose formatting options: indentation size (2 or 4 spaces) and attribute wrapping.
Observe the formatted output instantly below.
Copy the formatted HTML or export to your workflow.
Optional: Toggle minification for production-ready markup.

Frequently Asked Questions

Find Quick Answers

What does the formatter preserve?

The formatter preserves the document’s semantics, including doctype, comments, and the hierarchical structure of elements. It reformats whitespace, indentation, and attribute layout without modifying tag names, attribute values, or content, ensuring the output remains faithful to the input's meaning.

Can I customize indentation or attribute wrapping?

Yes. The tool supports configurable indentation (2 or 4 spaces or tab) and optional attribute wrapping. You can set preferences to enforce your team’s style guide across projects.

Does the tool validate HTML syntax?

No. It formats existing markup but does not perform structural validation or error-correction. For correctness checks, use a separate HTML validator or linter.

Is minification available?

Yes. A minification mode collapses whitespace and optional attributes, removes redundant line breaks, while preserving semantics; useful for production pipelines and performance-sensitive contexts.

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