XML Validator

updated 19 May 2026

validate

Drop a .xml file here, or

ready

XML Validator

Check whether an XML document is well-formed before a downstream parser hits the same wall. Uses the browser's native DOMParser — the same engine your runtime would use — and reports the first parse error with a line and column.

— S., [email protected]

What gets flagged

Mismatched / unclosed tags — <a>...</b> or <a>... without a close.
Unquoted / mismatched-quote attributes — <a x=foo> or x="foo'.
Bad entity references — &foo; for undeclared entities.
Bare ampersands and stray < in text content.

Privacy

100% client-side. No upload. See the privacy policy.