developer tools
XML Validator Online
Verify that XML documents are strictly well-formed before sending them to web services, APIs, or database parsers.
Processed locally in browser.
Indent:
INPUT (XML)
OUTPUT (XML)
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How to Use XML Validator & Syntax Checker
1
Paste XML
Input your XML document.
2
Validate
Click Validate to scan syntax.
3
Review Errors
See detailed syntax verification reports.
About XML Validator & Syntax Checker
Runs browser-native DOMParser and parses parsererror XML nodes to extract precise syntax failure lines and descriptions.
Supported Formats
XML
Operational Limits
- •Validates well-formedness; DTD/XSD schema validation not currently supported
Key Features
- Locates unclosed tags and mismatched elements
- Entity reference validation
- Line and column coordinate error reporting
- Instant pass/fail badge
Frequently Asked Questions
Well-formed XML satisfies all structural rules: single root element, properly closed and nested tags, and quoted attribute values.
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