HTML Formatter

A lightweight HTML formatter for developers to pretty print or minify HTML with configurable indentation and option controls.

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3,344+

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

A lightweight, local HTML formatter that accepts HTML input and returns either pretty-printed or minified code. It uses an HTML parser to normalize structure, then applies formatting rules to produce deterministic output.
Conceptually, the tool builds an in-memory representation of the markup and emits formatted text according to the selected mode, preserving entities and doctype awareness while normalizing whitespace.
This tool benefits frontend developers, template authors, and build engineers who require consistent markup across files and teams, aiding diffs and reviews. Its deterministic processing makes pipelines stable and reduces churn in codebases.
Core features include pretty print, minification, indentation control, attribute handling options, comment preservation, doctype awareness, and error reporting.

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How to Use

Provide inputs: paste HTML content and select mode (pretty or minify).
Configure options: set indentation, attribute handling, and comment policy.
Run formatting: trigger the formatter to produce output.
Retrieve outputs: copy or export the formatted HTML for inclusion in files.
Integrate: add as a step in CI/build pipelines for automated formatting.

Frequently Asked Questions

Find Quick Answers

What input formats are supported?

The tool accepts HTML content as plain text, including fragments or full documents. It normalizes structure and ensures valid output without executing embedded scripts. Large inputs are handled efficiently by streaming-like processing to avoid memory spikes.

Can comments be preserved?

Yes, there is an option to preserve comments during formatting. When enabled, comments remain in place in the resulting output, aiding readability and documentation.

Does formatting modify script content?

Formatting affects only whitespace and tag structure. It does not execute or evaluate JavaScript code inside script tags; the content within scripts is preserved as-is, with indentation adjusted if requested.

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