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XML Validator

Validators

Validate XML documents for well-formed syntax and structure.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What XML Validator does

The XML Validator parses an XML document and checks that it's well-formed — every tag properly closed and nested, a single root element, valid attribute syntax — flagging the exact line where parsing breaks. It's a fast way to catch a broken feed, config file, or data export before it's fed into something that expects clean XML.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use XML Validator

  1. Paste your XML document
  2. Click Validate
  3. Review whether it's well-formed, with the line number and reason for any error
  4. Fix the flagged issue and re-validate

Who should use it

Made for developers. Typical uses:

  • Debugging a broken RSS or Atom feed that's failing to parse in a feed reader
  • Checking a SOAP request or response body before troubleshooting an integration
  • Verifying a config file, like an Android manifest or Maven POM, is well-formed after a manual edit

Frequently asked questions

Is it free to use?
Yes, completely free.
Is my data uploaded anywhere?
No, validation happens entirely in your browser.
Does 'well-formed' mean the same as 'valid' XML?
No — well-formed means the syntax itself is correct; valid additionally means the document conforms to a specific DTD or XML Schema, which is a separate, stricter check.
What's the most common error it catches?
Unclosed tags, mismatched closing tags, and unescaped special characters like & and < that appear in text content instead of markup.
Does it validate against a DTD or XML Schema?
No, it checks well-formedness — correct syntax — rather than compliance with a specific DTD or XSD schema definition.

Learning resources

Explore more in Validators, read the guides and articles, or see how we test our tools.

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