XML Schema Validator

Validate XML documents against XSD schemas

Errors

    Warnings

      What Is XML Schema Validation?

      XML Schema Definition (XSD) is a W3C standard for describing the structure, content, and data types of XML documents. Validating an XML document against an XSD schema ensures that the document conforms to the expected structure — correct element names, proper nesting, required attributes, and valid data types. This is critical for data interchange between systems.

      How to Use This Tool

      1. Paste your XML document into the XML Document field.
      2. Paste the corresponding XSD schema into the XSD Schema field.
      3. Click Validate to check if the XML conforms to the schema.
      4. Review any errors or warnings displayed in the results panel.
      5. Click Load Sample to try with example XML and XSD.

      Common Use Cases

      • API Contract Validation: Ensure SOAP/XML API requests and responses match the agreed schema before processing.
      • Data Import Verification: Validate XML data files before importing into databases or enterprise systems.
      • Configuration File Validation: Verify application configuration files (web.config, Maven POM, etc.) are structurally correct.
      • Document Standards Compliance: Validate XML documents against industry standards like HL7, XBRL, or UBL.

      Frequently Asked Questions

      Well-formed XML follows basic syntax rules (proper nesting, closing tags, etc.). Valid XML goes further — it is well-formed AND conforms to a specific schema (XSD or DTD) that defines which elements, attributes, and data types are allowed.

      XSD (XML Schema Definition) is more powerful than DTD (Document Type Definition). XSD supports data types, namespaces, and complex constraints, while DTD uses a simpler, non-XML syntax with limited type support. XSD is the modern standard for XML validation.