XML Validator is a browser-native linting tool that strictly checks your XML documents for syntax errors and structural integrity. Dealing with massive XML feeds or complex SOAP XML payloads often results in cryptic parsing errors caused by a single missing closing tag or an unescaped ampersand. This utility evaluates your code instantly, providing precise line and column numbers to help you isolate frustrating XML format errors locally.
XML is strict — any syntax error (a missing quote on an attribute, an unescaped character, or a mismatched tag) causes the entire document to fail parsing. This tool runs your XML through the browser's built-in DOMParser, intercepts the error trace, and reports it as a human-readable message with the exact line and column number.
No. This tool checks XML well-formedness — that the document follows correct XML syntax rules (matching tags, proper nesting, valid attribute quotes, no illegal characters). It does not validate against an external XML Schema Definition (XSD) or Document Type Definition (DTD).
Yes. When the XML is invalid, the validator shows the line number, column number, and the specific parsing error message from the browser's built-in XML parser. This makes it much easier to find the problem than searching through a large XML document manually.
Yes. Validation runs using the browser's built-in DOMParser API, entirely on your device. No data is sent to any server, making this safe for proprietary API payloads, internal configuration, and sensitive business data.
Yes. Unescaped < and & inside XML text nodes are common errors that cause parser failures. The validator catches these and reports the location. Use < for < and & for & in text content.
Well-formed XML follows correct syntax rules (matching tags, proper nesting, valid characters). Valid XML is well-formed AND conforms to a specific schema (XSD or DTD). This tool checks well-formedness, which is required by all XML parsers.
Tool workspace
Free XML Validator online — instantly check XML syntax, detect malformed tags, and validate against XML 1.0 specifications securely in your browser. No login required.
Output
Input
<root> <name>John</root>
Output
