XML Validator & Tester

Check your XML syntax online. Find errors, validate structure, and ensure your XML is well-formed instantly.

XML Input

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Why use an XML Validator?

Errors in XML documents can cause applications to crash or behave unexpectedly. Our Online XML Syntax Checker helps you identify structural issues, missing tags, or incorrect attributes in your XML files before they cause problems.

Well-formedness Check

Ensure your XML follows the basic rules: a single root element, correctly nested tags, and properly quoted attributes.

Error Localization

Get specific line numbers and error descriptions to quickly find and fix syntax mistakes in large XML files.

XML Utilities

XPath Tester XML Formatter JSON to XML

Developer Tip

A 'well-formed' XML document is one that conforms to the XML syntax rules. This is different from 'valid' XML, which also conforms to a specific DTD or Schema.