Convert tools

HTML Formatter

Format HTML source with Prettier while preserving its parser’s whitespace semantics.

Convert in your browser · No sign-up

Does not preview or execute HTML. This is formatting, not HTML sanitization or validation against every browser.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

How to use

  1. Format HTML source with Prettier while preserving its parser’s whitespace semantics.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

<main><p>Hello</p></main> → indented HTML

Details and limitations

Does not preview or execute HTML. This is formatting, not HTML sanitization or validation against every browser.

Text stays in your browser; it is not sent to a conversion server.

FAQ

HTML Formatter — What are the supported inputs and limits?

Does not preview or execute HTML. This is formatting, not HTML sanitization or validation against every browser.

Format references

Tool page updated: