Free Online XML Validator & Syntax Checker
Validate any XML document for well-formedness instantly in your browser. The validator checks for proper tag nesting, matching opening/closing tags, valid attribute syntax, proper character encoding, and XML declaration. Get detailed error messages with line and column numbers to quickly locate and fix issues in your SOAP payloads, configuration files, and data feeds.
Common questions
What does 'well-formed XML' mean?
Well-formed XML follows basic syntax rules: every opening tag has a matching closing tag, tags are properly nested, attribute values are quoted, and special characters are properly escaped. Well-formedness is the minimum requirement for any XML document.
Does it validate against XSD or DTD schemas?
This tool checks for XML well-formedness (syntax correctness). Schema validation against XSD or DTD requires additional schema files and is a different type of validation beyond basic syntax checking.