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XML Validator

Developer

Validate XML syntax and catch errors with line numbers and detailed error messages.

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XML Input
Result

An XML file that looks fine on a quick read can still be malformed somewhere specific, a tag that was never closed, a mismatched namespace prefix, an attribute missing its closing quote, and finding exactly where without a real error message means scanning the whole document line by line hoping to spot the one thing wrong. This tool validates XML syntax and reports exactly where a problem is, the specific line number and a detailed message describing what's actually wrong, rather than a generic pass-or-fail with no indication of where to even start looking.

See more about the XML Validator

Useful for pinpointing exactly which line an unclosed tag or a malformed attribute is on instead of scanning an entire document by eye, debugging why an XML file a parser rejects looks fine at a glance, or confirming a document is genuinely well-formed before it gets used somewhere that would fail on a syntax error.

Key features

  • Clean interface
  • Fast processing
  • No signup required
  • Works offline

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Quick answers for XML Validator

How does it detect XML errors?
It parses your input with the browser's native DOMParser and checks the resulting document for a parsererror node, showing the browser's own detailed error message when one appears.
What does a successful validation look like?
A green checkmark and a "Valid XML" label appear once your input parses without a parsererror node, no extra error details are shown.
Do I need to close every tag exactly?
Yes, DOMParser enforces strict well-formedness, so unclosed tags, mismatched closing tags, and invalid character sequences will all trigger the error path here.