XML Validator
Check whether your XML text is well-formed (valid syntax). Everything runs on your device — nothing is sent to a server.
The result will appear here…
or press Ctrl+Enter
Everything runs in your browser. Your data is never sent to our servers.
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Example
Example Input
<a><b></a>
Example Output
✗ INVALID XML — tag mismatch
How to Use
- 1Paste your data into the Input field.
- 2If the tool has "More settings" (mode, query, columns, etc.), set them as needed.
- 3Click the button (or press Ctrl+Enter) to process.
- 4Copy the result with the Copy button.
About XML Validator
This tool checks whether your XML text is syntactically valid. If there is an error, it shows the message so it is easy to fix.
XML must be "well-formed": every opened tag must be closed, attributes must be quoted, and there must be a single root. This validator catches violations of those rules.
Validation happens in the browser — just paste your data and click. Nothing is uploaded, so it is safe for sensitive data.
FAQ
Is my data sent to a server?
No. XML Validator runs entirely in your browser using client-side libraries. Your data never leaves your device.