What is an HTML formatter online?

An HTML formatter (HTML beautifier) takes minified or poorly indented HTML and adds correct indentation and line breaks, making the DOM structure clear and readable.

What is the difference between an HTML formatter and a validator?

An HTML formatter adds indentation and improves readability. An HTML validator checks whether your markup is standards-compliant (proper tags, attributes, nesting). This tool focuses on formatting.

HTML Beautifier / Minifier — Free Online Tool (2026)

Use HTML Beautifier / Minifier for free — format or compress html markup. This tool runs 100% in your browser with zero server uploads. Part of ZeroApiTools, a collection of 65+ free developer tools. No signup, no API keys, no data collection. Works offline.

ZeroApiTools' free HTML Formatter Online instantly formats messy, minified, or collapsed HTML markup into clean, properly indented, readable code — no server upload, no signup, runs 100% in your browser. Also known as an HTML Beautifier or HTML code formatter.

What is an HTML Formatter?

An HTML Formatter (HTML Beautifier) takes unindented or minified HTML and adds correct indentation, line breaks between tags, and proper nesting structure, making the markup easy to read, debug, and maintain.

How to Use the HTML Formatter on ZeroApiTools?

Paste your HTML — minified, copied from DevTools, or exported from a WYSIWYG editor — into the input area.
Select your preferred indentation size (2 or 4 spaces).
Click Format and copy the clean, properly nested HTML output.

Is this HTML formatter free with no upload?

Yes. This HTML Formatter is completely free and runs 100% in your browser. Your HTML code is never sent to any server.

Can I also minify HTML with this tool?

Yes! The tool works in both directions — click Minify to collapse formatted HTML into a single-line, production-ready string with all whitespace removed.