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XML Validator

Validate XML syntax and structure, pinpointing parse errors with details.

100% Client-Side Local Execution
Input XML Data
1
Transformed Result
Valid XML Syntax
No syntax errors found. The XML document is well-formed.
Path:XML
<root>
<valid>
true
</valid>
</root>

What is XML Validator?

The XML validator checks whether a document is well-formed XML and can optionally validate it against an XSD schema, flagging exactly where the markup breaks or deviates from the schema's rules. It's the tool for the common xml validator search intent that covers both basic syntax checking and schema compliance.

Technical Execution

For well-formedness, it runs the document through a strict DOM/XML parser that enforces XML syntax rules (matched tags, proper nesting, valid attribute syntax, correct entity escaping) and reports the exact line where parsing fails. When an XSD schema is supplied, it additionally checks element structure, types, and cardinality against that schema's rules.

Zero Data Storage Guarantee

Validation runs entirely client-side using your browser's XML parser, so documents being checked — which may be SOAP requests, enterprise data exports, or internal service configs — never leave your machine.

How to Use XML Validator (Step-by-Step Guide)

  1. Paste the XML document you want to validate
  2. Optionally provide an XSD schema if you need schema-level validation
  3. Review the valid/invalid status and any reported errors
  4. Jump to the flagged line number to fix the specific issue
  5. Re-validate until the document passes

Frequently Asked Questions (FAQ)

Q: What's the difference between well-formed and valid XML?
A: Well-formed means the XML syntax itself is correct (matched tags, proper nesting); valid additionally means it conforms to a specific schema (XSD or DTD) defining allowed elements and structure.
Q: Does this XML validator check against an XSD schema?
A: Yes, you can supply a schema for structural validation in addition to the basic well-formedness check.
Q: Is this the same as 'xml lint'?
A: Yes, 'XML lint' is the informal shorthand developers use for checking XML syntax correctness, which is exactly what the well-formedness check here does.
Q: Can I validate XML online for free without limits?
A: Yes, there's no account or payment required, and no artificial usage cap.
Q: What kind of errors does the syntax checker catch?
A: Unclosed or mismatched tags, invalid characters, improperly escaped entities (like a bare & symbol), and malformed attribute syntax are all flagged.
Q: Does it tell me the exact line of a validation error?
A: Yes, errors include the line and often the column where the parser or schema validator detected the problem.
Q: Is XSD schema validation required, or optional?
A: It's optional — you can check just for well-formedness without a schema, or add a schema when you need strict structural compliance.
Q: Can I validate a SOAP envelope with this tool?
A: Yes, SOAP messages are XML, so the well-formedness check applies directly, and schema validation works if you have the relevant WSDL-derived XSD.
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