XML Validator
Validate XML syntax and check for well-formedness.
Validation Checks:
- XML declaration presence
- Matching opening and closing tags
- Proper nesting hierarchy
- Tag name format validation
- Attribute quotation checking
About XML Validator
XML Validator checks that your XML is well-formed according to the XML 1.0 specification — every tag is closed, attributes are quoted, and there is a single root element. It reports the exact line and column of any error so you can fix it quickly. This is useful before submitting XML to an API, feeding it into a parser, or committing it to a repository.
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Frequently Asked Questions
Is XML Validator free?
Yes, completely free. No signup, no account, no usage limits. Use it as much as you need.
Is my data secure?
All processing happens directly in your browser using JavaScript. Your data is never sent to any server, stored, or shared. It stays entirely on your device.
What is the difference between well-formed XML and valid XML?
Well-formed means the XML follows basic syntactic rules (correct nesting, closed tags, etc.). Valid means the XML also conforms to a DTD or XML Schema that defines the allowed structure and element types.
Can it validate against an XML Schema (XSD)?
Currently the tool checks well-formedness only. XSD schema validation requires uploading both the XML and the XSD, which is on the roadmap.