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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.

100% In-Browser Privacy Instant Zero-Lag Execution Zero Data Uploaded

Frequently Asked Questions

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.

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