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ToolSuite
JSON, XML & YAML Tools

XML Validator

Check whether XML is well-formed and locate the first error.

Processed in your browser

Your result will appear here as soon as you add some input.

How to use it

  1. 1Paste your document into the input box, or type it directly.
  2. 2Adjust the options if you need something other than the defaults.
  3. 3The result updates as you type.
  4. 4Copy the result to your clipboard or download it as a file.

About the XML Validator

Well-formed means the syntax is correct: one root element, every tag closed, correct nesting, and the five reserved characters escaped. Errors are reported with a line and column.

That is a different question from valid. Validity means the document also conforms to a DTD or an XSD schema, which needs the schema itself and is not checked here.

Questions people ask

Is your document uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your document never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.