HTML Formatter

A fast, client-side HTML formatter that beautifies or minifies markup, helping developers read, share, and review HTML safely without changing its behavior.

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524+

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

This tool is a client-side HTML formatter designed to improve the readability and consistency of HTML code. It accepts raw HTML, applies deterministic indentation, and optionally minifies output. It is intended for developers, testers, and content editors who frequently exchange HTML fragments and templates.
Conceptually, the formatter parses the input into a hierarchical representation, then emits HTML text with uniform line breaks and indentation. It preserves document semantics, attributes order, and content inside preformatted blocks and script/style content, so behavior is unchanged. Users can select indentation style and size, enable or disable minification, and control whether long attributes wrap.
The tool provides value by reducing diffs in code reviews, standardizing team practices across repositories, and speeding up template sharing. Its differentiators include a focus on preserving semantics, compatibility with HTML5 parsing rules, and a choice of non-destructive formatting that can be applied in pipelines or ad-hoc workflows.

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How to Use

Provide input HTML in the input area.
Choose formatting options: indentation style (spaces or tabs), indent size, and whether to minify.
Run the formatter to generate formatted HTML in the output area.
Copy, review, or export the result for integration into your project.
Validate diffs and integrate into your workflow.

Frequently Asked Questions

Find Quick Answers

What does this tool do?

It formats HTML by applying consistent indentation, line breaks, and optional minification while preserving semantics. It operates on raw markup or fragments, aiding readability, review diffs, and collaboration among developers without changing the document's behavior.

Does it guarantee valid HTML?

The formatter attempts to parse HTML according to HTML5 rules but does not perform full validation or linting. If parsing fails, the tool may return the input unchanged or only partially formatted, and results should be reviewed in a live environment.

Can it format CSS or scripts inside HTML?

Yes, CSS and JavaScript within style and script blocks are treated as raw content. The formatter focuses on HTML structure and attributes; it may minify text outside of preformatted blocks, while preserving the integrity of executable code or CSS semantics.

Is it safe to use in production workflows?

Yes, formatting is non-destructive: the output encodes the same document structure and behavior as the input. Always test in your environment, especially pages with dynamic scripts or template literals that rely on whitespace; compare diffs before committing changes.

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