XML Formatter & Validator
Beautify and check XML for well-formedness instantly in your browser.
How this tool works
Paste your XML
A SOAP payload, RSS feed, or config file all work the same way.
Parser checks well-formedness
The browser’s own XML parser flags unclosed tags, mismatched elements, or invalid characters.
Get indented output
Valid XML is re-serialized with clean nesting so element structure is easy to scan.
Copy the result
Grab the formatted XML with one click once it parses cleanly.
Quick facts
- Category
- Formatters & Beautifiers
- Best for
- Cleaning up SOAP payloads or RSS feeds for readability
About this tool
Paste any XML and get cleanly indented output with elements and nesting easy to scan, using the browser’s own XML parser to catch malformed markup as you type. This checks well-formedness - unclosed tags, mismatched elements, invalid characters - not conformance to a specific DTD or XSD schema, so validly-structured XML that violates a particular schema will still format successfully. Everything runs client-side, so your data never leaves the browser. Use it to clean up SOAP payloads, RSS/Atom feeds, config files, or API responses for readability.
Why use this tool
Real parser, not regex
Uses the browser’s native XML parser, the same engine that would reject malformed XML in production.
Specific error feedback
Well-formedness errors are surfaced clearly instead of silently producing broken output.
Adjustable indentation
Toggle between 2 and 4 spaces to match your project’s formatting convention.
No schema required
Checks well-formedness only, so you don’t need a DTD or XSD on hand just to clean up markup.
Frequently asked questions
No - this tool checks that your XML is well-formed (properly nested, closed tags, valid syntax), not that it conforms to a specific schema. XML that passes here can still fail validation against a particular XSD or DTD.
Common causes include an unclosed or mismatched tag, an attribute value missing quotes, multiple root elements, or invalid characters like a bare "&" that isn’t part of an entity reference.
The formatter re-serializes the parsed element tree, so the output focuses on element structure and text content - comments and processing instructions outside the document element may not be reproduced in the formatted output.
Explore more free tools
Formatters, converters, validators, and generators - all free and running entirely in your browser.
Browse more tools