About this tool
Beautify raw HTML so you can read, review, and debug markup more easily in the browser.
HTML Formatter is most useful when copied markup is technically readable by browsers but hard for humans to scan. It gives developers a quick way to re-indent pasted templates, snippets, embeds, and generated fragments before debugging or sharing them in docs, tickets, or pull requests.
- Uses Prettier 3.8.1 HTML, Babel, Estree, and PostCSS plugins to format markup plus optional embedded script and style content.
- Controls tabs or spaces, print width, HTML whitespace sensitivity, one-attribute-per-line layout, closing bracket placement, and embedded language formatting.
- Runs locally with input and output bounds and requires the result to remain stable when formatted again with the same policy.
How to use HTML Formatter
Paste the HTML snippet you want to clean up, run the formatter, and inspect the nested output before copying it back into your editor. If the markup still looks suspicious after formatting, use the result as a readable starting point for validation rather than assuming the formatter has fixed semantic HTML issues.
When this tool is useful
- Uses Prettier 3.8.1 HTML, Babel, Estree, and PostCSS plugins to format markup plus optional embedded script and style content.
- Controls tabs or spaces, print width, HTML whitespace sensitivity, one-attribute-per-line layout, closing bracket placement, and embedded language formatting.
- Runs locally with input and output bounds and requires the result to remain stable when formatted again with the same policy.
Examples you can test
Load an example, compare the result with the expected output, then replace it with your own input.
Format a compressed snippet
Example input
<div><h1>Title</h1><p>Copy</p></div>
Expected output
Indented HTML with nested tags on separate lines
Readable markup is easier to review before pasting into docs, templates, or issue comments.
Inspect copied embed code
Example input
<iframe src="..."></iframe><script>...</script>
Expected output
Formatted embed structure
Formatting helps review structure, but it does not make third-party embeds safe by itself.
Validation checklist
- Validate important markup after formatting if semantic correctness matters.
- Review scripts and iframes from unknown sources before using them.
- Keep the original snippet when debugging a formatting or escaping issue.