HTML Formatter Online - Free HTML Code Beautifier

Format and beautify HTML markup. Fast, secure, and completely free. All processing happens in your browser — no data is sent to any server.

What is an HTML Formatter?

An HTML Formatter re-indents markup so each nested element sits one level deeper than its parent, making the document's structure visible at a glance. HTML pulled from a live page's 'View Source', generated by a templating engine, or minified for production is usually one dense block with little or no indentation — readable to a browser, but not to a person trying to find where a `<div>` closes or why a component isn't nesting the way it should. This tool parses the tag structure and reprints it with consistent indentation, while leaving the actual tags, attributes, and text content untouched.

How to Use HTML Formatter

Paste minified or single-line HTML into the input field
Click 'Format' to indent nested elements according to their depth in the DOM tree
Scan the output to find unclosed tags or unexpectedly shallow nesting
Copy the formatted markup into your editor, a template file, or a bug report
Use the HTML Minifier separately if you need to compress it back down afterward

Key Features

Indents nested elements according to actual DOM depth
Preserves inline elements and whitespace-sensitive tags like <pre> correctly
Handles self-closing tags, comments, and inline scripts/styles without breaking them
Works on full documents or isolated HTML fragments
Entirely client-side — safe for internal templates and unpublished markup

Why Use HTML Formatter?

Viewing a live page's source or a server-rendered template's raw output almost always means facing a single dense block of HTML with no visual hierarchy. Reformatting it is the fastest way to understand how a third-party widget structures its markup, to debug why your own component's nesting broke during a build step, or to make an HTML snippet legible before pasting it into documentation or a support ticket.

Common Use Cases

Understanding how a third-party embed or widget structures its markup
Debugging broken nesting after a templating engine or build tool minifies output
Cleaning up HTML copied from a CMS's raw source view
Preparing a readable HTML snippet for a bug report or code review
Reviewing server-rendered output during frontend/backend integration debugging

Frequently Asked Questions

Will formatting change how the page renders?

No — formatting only adds indentation and line breaks between tags; the actual elements, attributes, and rendered output stay identical.

Does it preserve whitespace-sensitive tags like <pre> or <textarea>?

Yes, content inside whitespace-sensitive elements is left untouched so you don't accidentally change what's displayed inside them.

Can I format a full HTML document including <head> and inline <script> tags?

Yes, full documents format correctly; inline scripts and styles are indented as blocks without having their internal JS/CSS reformatted separately.

Does it fix invalid or unclosed HTML tags?

It formats what it can parse and generally tolerates minor issues the way browsers do, but it isn't a strict validator — use an HTML validator if you need explicit error checking.