What is an HTML Formatter?
An HTML formatter adds readable line breaks and indentation to compact or inconsistent markup while preserving tags, attributes, comments, and text content.
Web Tools
HTML formatting guideHTML Formatter
Format messy HTML into clean, readable markup in your browser with indentation options and helpful validation hints.
HTML input
Paste a full page, component template, or partial snippet.
Formatted HTML
Readable output with tolerant markup warnings.
Ready to beautify HTML
Paste HTML or load a sample. Partial snippets and template-style attributes are welcome.
Tip: Press Ctrl+Enter or Command+Enter in the editor to format immediately.HTML Formatting Guide
Beautify HTML locally without rendering or executing it
Use this formatter to add consistent indentation, review markup structure, and spot common nesting issues in pages, snippets, and component templates.
How to beautify HTML
Paste HTML, choose indentation and preservation options, then select Beautify HTML. Review warnings before copying or downloading the formatted file.
HTML formatting vs HTML validation
Formatting improves presentation. Validation checks conformance to HTML rules. This tool provides helpful structural hints, but it is not a standards-complete validator.
Common HTML formatting issues
Missing closing tags, mismatched nesting, long attribute lists, dense minified markup, and inconsistent comments can make templates difficult to review.
Formatting snippets vs full HTML pages
Full documents can include a doctype, head, and body. Partial fragments and custom component markup are also accepted without requiring a document wrapper.
Templates and custom attributes
Custom elements, Angular-style bindings, event attributes, template expressions, data attributes, and ARIA attributes are treated as inert source text and preserved where practical.
Privacy and local processing
Formatting, warnings, copy actions, and downloads run locally in your browser. HTML is displayed as escaped code and is never inserted as live page content.
HTML Formatter FAQ
Does this HTML formatter upload my HTML?
No. Your markup is processed locally in your browser and is not sent to a server.
Can it format partial HTML snippets?
Yes. You can format fragments, components, custom elements, and full HTML documents.
Does it execute scripts?
No. HTML, scripts, inline event handlers, templates, and expressions remain inert text. External resources are not fetched.
Does it preserve comments and attributes?
Yes. Comments are preserved by default, and tag attributes remain source text, including data and ARIA attributes.
Can it format Angular or template-style HTML?
Yes, conservatively. Template attributes and expressions are preserved, though framework-specific syntax is not validated.
Is HTML formatting the same as validation?
No. Formatting changes whitespace and indentation. The warnings here identify common structural repairs, not every standards or accessibility issue.