Free XML Validator Online
Validate XML syntax instantly — check for well-formedness errors using the browser's native DOMParser. No uploads.
How it works
Paste your XML
Paste the XML you want to validate into the input field.
Validate
Click Validate XML or press Ctrl+Enter. The parser checks well-formedness.
Review results
If valid, you see a green success message. If not, the error location and message are shown.
Browser-only
DOMParser is a native browser API — your XML never leaves your tab.
Common use cases
Pre-deployment checks
Validate XML config files (Spring beans, Maven POM, Android manifests) before deploying to catch syntax errors early.
API response debugging
Validate XML responses from SOAP APIs to confirm the server is returning well-formed XML before parsing it in code.
Data feed validation
Validate RSS, Atom, and sitemap XML feeds before submitting them to feed aggregators or search engines.
Generated XML checking
Validate dynamically generated XML output from your application to catch serialization bugs.
Frequently asked questions
What is well-formed XML?
Well-formed XML follows the XML specification: every tag is closed, attributes are quoted, special characters are escaped, and there is exactly one root element.
Does this validate against a schema (XSD/DTD)?
No — this tool checks well-formedness only. Schema validation (checking that elements and attributes match a definition) requires server-side tools like xmllint.
What are common XML errors?
Unclosed tags (<br> instead of <br/>), unquoted attributes (id=foo instead of id="foo"), unescaped & (use &), missing root element, or invalid characters.
Is my XML sent to a server?
No. The validator uses the browser's native DOMParser — all processing happens locally.