XML Validator
Validate XML documents for well-formedness using the browser's native DOMParser. Instant feedback with detailed error messages.
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About this xml validator
The XML validator checks that markup is well-formed, with matching tags, legal nesting, and valid basic structure. It is useful before submitting XML to APIs, importing feeds, or handing generated XML to another system.
Common uses
- Check XML API payloads before sending them.
- Validate RSS, Atom, sitemap, or SVG text after edits.
- Catch broken nesting in copied XML exports.
Practical notes
This checks well-formed XML, not every domain-specific schema rule.
For strict enterprise integrations, follow up with the XSD or vendor validator required by that system.
Frequently Asked Questions
What does XML validation check?
This tool checks for well-formedness: properly closed tags, correct nesting, valid attribute syntax, proper encoding declarations, and correct XML structure. Note: DTD/Schema (validity) validation is not supported.
What is the difference between well-formed and valid XML?
Well-formed XML follows basic XML syntax rules (closed tags, proper nesting, etc.). Valid XML additionally conforms to a specific schema (DTD, XSD). This tool checks well-formedness.