Runs locally in your browser. Nothing you enter is uploaded to our servers.
Result will appear here
Tips for validating XML
Ensure a single root element and matched tags.
Watch namespaces and prefixes in real documents.
Escape special characters in text nodes (&, <, >).
DTD/XSD validation is separate from well-formedness checks.
Large files may fail for structure issues far from the reported line.
Well-formed XML, not a business schema
Processing stays in your browser — your input is not uploaded to our servers.
This check tells you whether the markup is well-formed: matching tags, a single root, legal characters. It is not an XSD/DTD schema audit.
Use it before importing a feed or config that will fail in a picky parser.
Validate XML markup
Paste the XML
Include the declaration if the document has one — some parsers care.
Run the well-formed check
The first mismatch is the one to fix; later errors often follow from it.
Re-check after edits
Unescaped & and mismatched case in tags are common leftovers.
XML validator FAQ
Does this validate against an XSD?
No. Well-formedness only. Schema validation belongs in your toolchain.
Can I paste HTML?
HTML is often not well-formed XML. Use this for actual XML documents.
Is the file uploaded?
No. Parsing stays in the browser.