Online XML and XSD Validator
Check XML structure, optionally compare required elements against an XSD, and receive clear client-side validation feedback. It gives integration developers a quick XML schema checker for feeds, SOAP payloads, and configuration documents before deployment.
What is an XML/XSD validator?
XML well-formedness checks syntax and nesting. XSD validation goes further by comparing an XML document with a schema that describes expected elements and data structure.
How to use this validator
Paste XML into the first editor and an optional XSD into the second, then select Validate XML. Parser failures include a line number when the browser exposes one; schema failures identify missing required elements.
Client-side schema checking
The browser's DOMParser performs the syntax work locally. The compact XSD subset is designed for quick required-element checks without shipping documents to a validation service.
How to use XML/XSD Validator for related tasks
Validate XML online first for parser errors, then add an XSD and inspect missing required elements with their reported context.
Related tools: XML Formatter, JSON Schema Validator.
Frequently asked questions
What does the XML check validate?
It checks that the XML is well-formed: tags are balanced and nested, attributes are valid, and there is one root element. When an XSD is supplied, the tool also checks declared required elements in its supported subset.
Is full XSD validation supported?
This client-only tool supports required xs:element declarations and reports missing elements. It does not implement every XSD feature such as complex type restrictions, imports, or custom validators.
Are XML documents uploaded?
No. DOMParser validates both XML and XSD locally. Nothing is transmitted or stored.
Why is valid-looking XML rejected by an XSD?
Well-formed XML can still violate a schema because an element is missing, named differently, or placed in an unexpected sequence.