HTML Formatter Live

A live HTML formatter that instantly tidies and indents markup, helping developers produce clean, consistent code with minimal effort.

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1,308+

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 Live 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 Live provides deterministic HTML reformatting to standardize markup across projects.
It parses input, preserves semantics, and returns a consistently indented, readable version suitable for reviews and diffs.
Conceptually, it builds a DOM-like representation and serializes it with controlled indentation, line breaks, and attribute formatting, ensuring compatibility with HTML5 standards while retaining content integrity in script, style, and pre blocks.
Target users include frontend developers, template engineers, CMS editors, and teams integrating HTML scaffolding into build pipelines. Its value lies in accelerating cleanup, reducing manual edits, and delivering predictable output for cross-project consistency.
Distinctive features include tolerant parsing, real-time formatting readiness, and advanced options for indentation size, attribute wrapping, and quote style, all without executing embedded code or altering semantics.

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How to Use

Provide inputs: paste HTML source or load a file into the input field.
Configure optional settings: set indentation size (2 or
, wrap attributes, and specify blocks to preserve.
Run formatting: trigger the formatter to produce a formatted output.
Review outputs: examine the formatted HTML in the result area and adjust options if needed.
Export or copy: copy the formatted HTML or save to a file for use in development or deployment.

Frequently Asked Questions

Find Quick Answers

What does HTML Formatter Live do?

HTML Formatter Live reformats HTML source to a consistent indentation and whitespace style while preserving the document's structure and semantics. It targets developers and editors who need clean, reviewable markup without altering content.

Which inputs are supported?

The tool accepts plain HTML strings as input, with optional settings for indentation size, attribute wrapping, and blocks to preserve. It returns a formatted HTML string and preserves content within pre, code, script, and style blocks.

Is scripts and styles touched?

Formatting is applied to the surrounding HTML structure, while content inside script, style, and pre blocks is preserved as-is. The tool does not execute or modify embedded code or data within those blocks.

How does it handle invalid HTML?

The formatter uses a tolerant parser that attempts to recover from malformed markup and formats what it can. If parsing cannot proceed, it returns the best-effort formatted subset along with an error indicator for diagnostics.

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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