XML / XSD Validator
Paste or upload an XML file and an XSD schema to validate them against each other. Errors are highlighted directly on the relevant line.
XML Document
XSD Schema
Validation Errors
About XML / XSD Validation
XSD (XML Schema Definition) defines the structure, data types, and constraints that an XML document must follow.
This tool uses PHP's built-in DOMDocument and libxml to validate your XML against the schema server-side.
- Exact line & column numbers for every error
- Click any error to jump to and highlight the line in the XML editor
- Well-formedness check even without an XSD
- Supports uploading .xml and .xsd files directly