XML Validator
Validate XML data and find errors with line numbers instantly.
Documentation
XML validation checks whether your data follows proper XML syntax rules. It catches errors like unclosed tags and mismatched elements.
Invalid XML can break parsers, fail API calls, and cause config errors. Validating first saves debugging time.
- 1) Paste your XML data into the input box.
- 2) Click Validate to check for errors.
- 3) Review the result — well-formed or error with details.
FAQs
An XML validator checks whether your XML is well-formed and reports errors with exact line numbers.
Common errors include unclosed tags, mismatched tags, missing root elements, incorrect attribute syntax, and undefined entities.
No. All validation happens locally in your browser. Your data is never uploaded or stored.
Yes. The XML validator is completely free with no signup or limits.
Well-formed XML follows basic syntax rules. Valid XML also conforms to a DTD or XML Schema. This tool checks well-formedness.