XML Validator

Validate XML document syntax, check well-formedness, and detect structural issues.

100% Browser-Based

Files Never Leave Your Device

No Server Uploads

Zero Data Collection

How It Works

Paste your XML content or upload an .xml file for validation.

The validator checks syntax, nesting, and well-formedness rules.

See detailed error messages with line numbers and element paths.

Make corrections and re-validate until your XML is well-formed.

Validates proper element nesting, closing tags, and attribute syntax.

Checks XML declaration and character encoding settings.

Precise error location with line numbers and element context.

Validates namespace declarations and prefix usage.

All validation happens locally in your browser.

What XML errors does it detect?

The validator detects unclosed tags, improper nesting, invalid characters, missing root elements, and all well-formedness constraints.

Does it validate against a schema (XSD)?

Currently the validator checks well-formedness (syntax). Schema validation (XSD/DTD) is planned for a future update.