Free XML Validator

Check whether your XML is well-formed and pinpoint parsing errors.

Loading tool…
  • 🔒 Files never leave your device
  • ⚡ Converted in your browser
  • ✅ No account required

XML Validator: The Complete Guide

Paste your XML to instantly check whether it's well-formed. Get a clear error message if something is wrong, or confirmation of the root element if it's valid.

How to use the XML Validator

  1. Paste or type your code, text, or data into the input box.
  2. Adjust options such as indent size, dialect, or flags when the tool offers them.
  3. The output updates instantly — copy it to your clipboard or download the file.

Features

  • Instant well-formed check
  • Clear parser error messages
  • Confirms the root element
  • Runs locally in your browser

Why use this tool

  • Catch unclosed or mismatched tags
  • Validate feeds and config before deploy
  • No upload — safe for private data

Well-formed vs. valid XML

This tool checks that your XML is well-formed — every tag is closed, properly nested, and correctly quoted. (Validation against a specific DTD or XSD schema is a separate step.) Well-formedness is the baseline every XML document must meet to be parsed.

Frequently Asked Questions

Does it check against a DTD or XSD schema?

No — it checks that the XML is well-formed (correct syntax and nesting). Schema validation requires the specific DTD/XSD for your document.

What makes XML not well-formed?

Unclosed tags, mismatched or overlapping tags, missing quotes around attributes, and more than one root element.

Is it free and private?

Yes — it's 100% free with no signup, and everything runs locally in your browser, so your data is never uploaded to a server.

You Might Also Need