Paste your XML to check whether it's well-formed, catching unclosed tags, mismatched tags, and multiple root elements.
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Well-formed XML follows XML's basic syntax rules: every opening tag has a matching closing tag (or is self-closed), tags are properly nested without overlapping, and the document has exactly one root element containing everything else. This tool checks exactly those rules using its own hand-written parser.
'Well-formed' and 'valid' are different concepts in XML. Well-formed means the syntax is structurally correct, which is what this tool checks. 'Valid' additionally means the document conforms to a specific schema (like an XSD or DTD) defining which elements and attributes are allowed, this tool doesn't check schema validity.
The error message describes the specific tag or structural problem found (like which closing tag was unexpected), though it doesn't report a line number since the check is based on tag structure rather than raw text position.
No, all validation happens entirely in your browser, your data is never transmitted anywhere.
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