XML Diff Checker
Compare two XML documents by parsed structure. Read changed paths while ignoring attribute order and whitespace used only for indentation.
Open toolXML Validator
Check XML well-formedness without fetching external resources. Up to 100,000 characters.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Validate XML.
Your result
Enter your details
Result will appear here
How XML Validator works
Check XML well-formedness without fetching external resources.
Up to 100,000 characters. DOCTYPE is rejected. This checks syntax only; XSD, DTD and application schema validation are not supported.
How to use XML Validator
Follow the labelled inputs.
Paste your XML source
Replace the example with the XML document you want to check. The limit is 100,000 characters.
Input and settings
Review the document
Check that opening and closing tags match. DOCTYPE declarations are rejected; text inside comments and CDATA is allowed.
Tool result
Run, review and save
Select Validate XML. Review the well-formedness verdict and root element name, then copy it or download the result text.
Review the details
Examples and uses for XML Validator
Check the supplied example
The starting example produces Well-formed XML; Root element: root. Check XML well-formedness without fetching external resources.
Use your own inputs
Paste your own XML document to check its syntax. This does not validate XSD, DTD or application rules.
Record a reviewed result
Keep the exact source with the syntax verdict so you can check the same document again.
How to read the result
A well-formed result reports the original root element name. A syntax error means the document could not be parsed.
Check XML well-formedness without fetching external resources.
Up to 100,000 characters. DOCTYPE is rejected. This checks syntax only; XSD, DTD and application schema validation are not supported.
Supported input and limits
Check the stated scope before you run it.
Up to 100,000 characters. DOCTYPE is rejected. This checks syntax only; XSD, DTD and application schema validation are not supported.
The input stays in this browser. Copy result and Download save the same displayed text.
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Open toolXML Validator: common questions
Answers about using XML Validator and understanding its results.
Which inputs does this tool accept?
Up to 100,000 characters. DOCTYPE is rejected. This checks syntax only; XSD, DTD and application schema validation are not supported.
Can I copy or download the result?
Yes. Copy result copies the displayed verdict and root name; Download saves the same text. Validation runs in your browser without an account.
Check your XML syntax
Check the well-formedness verdict and root element name, then copy or download it.