XML Validator
Check XML for mismatched tags, invalid attributes, malformed declarations, and other well-formedness errors with location details.
Valid XML
XML input
Validated output
Check XML syntax
The validator catches structural problems before a document reaches an API, build system, or configuration loader. Valid documents are shown in a readable normalized form for quick inspection.
Frequently Asked Questions
What does well-formed XML mean?+
A well-formed document follows XML syntax rules, including one root element, properly nested tags, quoted attributes, and valid names.
Does this validate against an XSD or DTD schema?+
No. It checks XML syntax and well-formedness, not application-specific rules defined by an external schema.
Why can valid XML still fail in another application?+
The receiving application may require a particular schema, namespace, encoding, or business rule beyond basic XML syntax.
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