HTML Formatter

A precise HTML formatter that produces consistent, readable markup for developers, CMS editors, and code reviewers who need clean, maintainable HTML.

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720+

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

HTML Formatter accepts raw HTML, analyzes syntax, and outputs consistently formatted markup. It preserves semantic structure while applying standard indentation, line breaks, and attribute ordering to improve readability and diffs.
Conceptually it uses a tolerant parser to build a tree, traverses nodes, and serializes with a deterministic style. It treats void elements and preformatted blocks specially to avoid altering their content.
Target users include front-end developers, code reviewers, CMS content teams, and QA engineers who need predictable markup for audits, version control, and automated checks. Unique value comes from configurable formatting: indentation size, quote style (single vs. double), and optional minification for production assets.
Core features include handling HTML5 semantics, preserving pre blocks, deterministic indentation, and optional settings for quotes and attribute wrapping. Use cases span standardizing HTML from disparate sources, preparing diffs for pull requests, and integrating into CI pipelines.

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How to Use

Provide inputs: paste or upload HTML code.
Configure options: indentation size, quote style, wrap attributes, and minification (advanced).
Run beautify: trigger the formatter to produce structured markup.
Review outputs: compare before/after and adjust settings if needed.
Copy/export: save the formatted HTML for integration.

Frequently Asked Questions

Find Quick Answers

What input formats are supported?

Supports plain HTML and HTML fragments; adheres to HTML5 semantics while tolerating common markup variations.

Can it minify output?

Yes, an optional minification mode can remove whitespace and line breaks for production assets.

What happens to preformatted content?

Pre and code blocks are preserved as-is to avoid altering user-intended formatting.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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