HTML Formatter & Beautifier

Beautify HTML markup with proper indentation and consistent formatting using js-beautify.

Processed in your browser. No data is sent to our servers.

How to Format HTML Online

Messy or minified HTML is difficult to read and error-prone to edit. Paste your markup into the input area and click Format HTML. The tool uses the html_beautify engine from js-beautify to add consistent indentation, place each attribute on a readable line when appropriate, and normalize tag spacing. It handles HTML5, embedded CSS in style tags, and inline JavaScript in script tags. The formatted output is ready to copy into your editor, paste into documentation, or use as a reference when debugging layout issues.

Why Format HTML?

Well-formatted HTML reveals the document structure at a glance. Nested elements, parent-child relationships, and forgotten closing tags become obvious with proper indentation. This is especially valuable when working with server-rendered HTML, email templates, or legacy codebases that lack consistent style. The formatter processes everything in your browser — no data is uploaded — so it is safe for internal admin panels, authenticated page source, or any HTML containing sensitive information. Use it alongside your browser DevTools for a complete debugging workflow.

Frequently Asked Questions

No. The formatter improves readability by adding indentation and line breaks. It does not check for invalid tags or missing attributes.

Yes. The formatter recognizes style and script blocks and formats their contents appropriately.

The formatter only changes whitespace. Tag names, attributes, and content remain unchanged, so the rendered page looks identical.

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