Validate XML well-formedness and check structure against an XSD schema. Browser-based.
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XML Document
XSD Schema (optional)
Validate XML is a free online tool that checks if your XML is well-formed and performs basic structural validation against an optional XSD schema. It uses the browser's built-in DOMParser for well-formedness checks and a custom element/attribute checker for XSD validation.
XML well-formedness is checked using the browser's DOMParser (application/xml). If the XML contains a <parsererror> element in the result, the XML is invalid and the error message is extracted. For XSD validation, the tool parses the XSD to extract expected element names and checks them against the XML structure.
Paste your XML
Paste the XML content you want to validate into the input area.
Validate
Click "Validate". The tool checks the document for well-formedness: matching tags, proper nesting, and valid attribute syntax.
Review errors
Any errors are listed with line numbers and descriptions. Fix each one and re-validate.
Use for schema validation (optional)
Upload an XSD schema file to validate your XML against a specific structure definition.
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Well-Formedness Detection
Uses the browser's native DOMParser to check XML syntax according to the W3C specification with no dependencies.
Basic XSD Validation
Optionally paste an XSD schema to check that all element names in your XML are declared in the schema.
Clear Error Messages
Parser error text is extracted and displayed directly so you know exactly which tag or character is invalid.
Element Count Summary
Displays the total element count on success, giving a quick sanity check that the document is complete.
Optional Schema Input
Validate XML alone or with a schema — both modes are available so the tool fits any workflow.
Client-Side Privacy
No XML or XSD data is ever uploaded, making it safe to validate confidential enterprise documents.
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