XML Validator
Check XML for well-formedness using your browser's built-in parser.
Drop an XML file
or paste XML below
An XML well-formedness check confirms that elements are properly opened and closed, attributes are quoted, and the document parses without errors. Converterzilla's validator uses your browser's built-in DOMParser — the same engine that parses HTML — so the check matches what most XML consumers will do.
How to use XML Validator in your browser
- Drop or paste XML. Upload a .xml file or paste content directly.
- Click Validate. We attempt to parse the XML and report any errors.
- Read the result. Green = well-formed. Red = a parse error with the line where it occurred.
Why use Converterzilla for XML Validator
Browser-native parser
Same engine that real-world consumers use — no fake validation that passes here but fails elsewhere.
Line-aware errors
First parse error shown with line number when available, so you can jump straight to the problem.
Private
Your XML never leaves your browser.
Frequently asked questions about XML Validator
Not yet — that needs a much larger validator (libxmljs2-wasm). The current tool checks well-formedness only.
Well-formed means the XML parses. Valid means it conforms to a schema (XSD/DTD). This tool checks the former.
No — namespaces are checked syntactically, not against any registry.