XML / XSD Validator
Check that your XML is well-formed, with an optional XSD schema to check element names. Works with files up to 200MB.
How to use this tool
Paste or upload your XML and click Validate to check that it's well-formed — unclosed tags, bad nesting, and invalid characters are reported with the line and column where the browser's parser stopped. Optionally paste an XSD schema to also flag any XML element names that aren't declared in it. Full XSD validation (types, attribute rules, occurrence constraints) requires a dedicated schema engine that isn't available in browsers, so this check covers element-name structure only — treat a pass here as "well-formed", not "fully schema-valid".
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