What is the XML Validator?
Check XML for well-formedness. The XML Validator is a free online tool that works instantly in your browser — no installation, no signup and nothing to upload. It sits alongside other XML tools on DevNibble such as XML Formatter, XML Minifier, XML to JSON.
How to use the XML Validator
- Paste your data into the input.
- Any errors are highlighted instantly with the exact location.
- Fix the issues and re-validate.
Features
- Runs 100% in your browser — your data is never uploaded or stored.
- Free forever, with no account, no ads and no tracking.
- Copy or download your result in one click.
- Fast and responsive on desktop, tablet and mobile.
Frequently asked questions
Is the XML Validator free to use?
Yes — XML Validator is completely free with no sign-up, no ads and no limit on how many times you can use it.
Is my data private when I use the XML Validator?
Everything happens locally in your browser. Your input is never sent to a server, which makes XML Validator safe to use with private or sensitive data.
How do I use the XML Validator?
Paste your content into the input and XML Validator checks it as you type, pointing out the exact location of any error.
Do I need to install anything to use the XML Validator?
No installation and no account required — XML Validator runs entirely in your web browser on desktop and mobile. Check XML for well-formedness.