XML Validator
Validate XML syntax and structure.
Validate XML syntax and structure.
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Tool guide
Free Online XML Validator
Check whether XML is well formed with the browser's XML parser. The tool reports the parser's first available syntax message and can save the validation result, but it does not validate application rules, XSD schemas, or DTD schemas.
Steps
How it works
- Paste XML or choose one XML or TXT file.
- Run the syntax check in your browser.
- Review the valid result or the parser error message.
- Copy or download a successful validation result if useful.
Highlights
Key features
- Checks XML well-formedness with DOMParser.
- Detects parser failures such as malformed or mismatched markup.
- Works with pasted content and supported XML or TXT files.
- Returns a clear success result when browser parsing completes without parser errors.
- Keeps the source unchanged and provides copy or text download for successful output.
Use cases
Common uses
- Check XML syntax before sending a payload.
- Find malformed markup in configuration or data files.
- Confirm that an XML snippet can be parsed by the browser.
- Perform a quick well-formedness check during development.
Notes
Limitations to know
- Validation is limited to browser XML parsing; XSD, DTD, Schematron, and business-rule validation are not included.
- The tool surfaces one browser parser message and does not provide a structured list of all errors.
- Line and column details are available only when the browser includes them in its parser message.
- Namespace use is parsed as XML syntax but not checked against an external schema.
- The validator does not load external resources, repair XML, sanitize content, or perform security scanning.
FAQ
Frequently asked questions
Does XML Validator validate against XSD?
No. It checks whether XML is well formed with the browser parser; XSD validation is not implemented.
Does it support DTD validation?
No. The tool does not perform DTD schema validation or load external validation resources.
Does it show the error location?
It displays the first parser message. Line or column information appears only if the current browser includes it.
What is the difference between well-formed and valid XML?
Well-formed XML follows XML syntax. Schema-valid XML must also satisfy rules defined by an XSD, DTD, or another schema, which this tool does not check.
Are namespaces checked?
Namespace syntax is parsed, but namespace-specific schema rules are not validated.
Does validation modify my XML?
No. The validator reads the input and reports a result without rewriting the source.