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HTML Formatter

Beautify and indent messy HTML markup.

Free browser toolRuns in your browserNo sign-up
Markup formatting studio

Turn compact HTML into a reviewable document tree

Apply consistent indentation and line breaks to HTML locally. Formatting improves readability but does not validate accessibility, semantics or browser rendering.

Waiting

status

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input size

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output size

HTML source

0 characters

Formatted HTML

No output yet
Source input is preserved until you explicitly replace it.
Private by design. Input is processed inside this browser tab and is not sent to ToolsOnDuty.

About the HTML Formatter

Minified or hand-edited HTML can be hard to read. Formatting it with proper indentation makes the structure clear.

Paste your HTML and this tool re-indents the tags into clean, readable markup.

It runs entirely in your browser, so your markup is never uploaded.

Key features

  • Beautify and indent HTML
  • Handles nested tags and attributes
  • Realistic sample and explicit .html download
  • Does not render or execute supplied markup
  • Runs in your browser

How to use

  1. 1Paste or load HTML, or use the realistic sample.
  2. 2Run Format HTML.
  3. 3Review the changed whitespace and indentation.
  4. 4Copy or download the .html result.

Examples

Format compact markup
Input: <main><h1>Hello</h1><p>World</p></main>
Output: Indented HTML with nested elements on readable lines

The document structure is preserved while whitespace is normalized.

Frequently asked questions

Does it change my markup?
It preserves the markup structure and content while changing whitespace, indentation and line breaks. Always review whitespace-sensitive elements before replacing source code.
Can it handle minified HTML?
Yes. Paste minified or single-line HTML and it re-indents the tags into a readable structure.
Is my markup uploaded anywhere?
No. Formatting runs entirely in your browser, so your HTML never leaves your device.

Continue your workflow

Open a related tool to prepare your files or refine the finished result.