Online XSD Checker

Validate XML documents against XSD schemas with detailed error reporting

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< 15ms

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100%

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4.9 / 5.0

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About This Tool

The XSD Checker is a comprehensive online tool that validates XML documents against XSD (XML Schema Definition) schemas. Upload XML and XSD files, paste content directly, or provide URLs to validate. The tool performs thorough validation including element structure, data types, constraints, and namespace compliance. Results show detailed error messages with line numbers and specific validation failures.

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How to Use

Choose input method: upload files, paste XML/XSD content, or provide URLs
For file upload: select XML and XSD files (or just XML if XSD is referenced internally)
For direct input: paste XML content in the first textarea and XSD in the second
For URL input: enter XML URL and XSD URL (optional if XSD is referenced)
Click 'Validate XML' button to check validation
View detailed results showing validation status, errors, warnings, and line numbers

Frequently Asked Questions

Find Quick Answers

What file formats are supported?

The tool supports XML files (.xml) and XSD schema files (.xsd). You can also paste XML/XSD content directly or provide URLs to XML/XSD files.

Does the tool validate against external XSD references?

Yes, the tool follows xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes in XML files to locate XSD schemas. You can also manually provide the XSD if not referenced.

What validation errors are detected?

The tool detects structural errors (missing elements, incorrect hierarchy), data type mismatches, constraint violations (min/max occurs, patterns), namespace issues, and schema compliance problems.

Is there a file size limit?

For optimal performance, we recommend files under 10MB. Larger files may take longer to validate but will still work.

Does the tool store my uploaded files?

No, all processing happens in your browser. Files are not uploaded to any server unless you use the URL input method.

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