A mismatched tag
A feed that will not parse has a </item> where </entry> was expected; the validator names both and the line.
Use XML Validator
Converts xml to result in this tab, with nothing sent anywhere.
Runs entirely on your deviceThe conversion happens in this browser tab. Nothing you type is uploaded, logged or stored, which is worth knowing for anything you would not paste into a search box.
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Browse all developer and data toolsAbout XML Validator
An XML validator checks that a document is well-formed: every tag closed, every pair matched, nothing overlapping. XML still carries a great deal of the world's data - RSS and sitemaps, SOAP and config files, office document internals - and a single unclosed or mismatched tag makes the whole document unparseable. This tool scans your XML in the browser and reports whether it is well-formed, naming the tag and line where the structure breaks when it does. It checks the structural rules that stop XML from parsing at all, which is the first thing to get right before any schema or meaning can matter, and it does so without sending your document anywhere. Feeds and sitemaps are a frequent case: a search engine or reader silently ignores a malformed feed, so confirming it is well-formed before publishing saves a debugging session spent wondering why nothing is picking it up.
Using XML Validator
- Paste your XML. It is scanned in this browser tab; the content never leaves your device.
- If every tag is matched and closed, the tool confirms the document is well-formed.
- If a tag is unclosed, mismatched or orphaned, the message names the tag and the line, so you can see exactly where the tree breaks.
Where xml validator helps
An unclosed element
Spotting a <div> that was never closed in a fragment of markup, reported with the line it opened on.
Before you use the result
- It checks well-formedness - the structural rules - not validity against a DTD or XSD schema, which is a separate, deeper check.
- Comments, processing instructions, CDATA and the XML declaration are recognised and skipped rather than treated as tags.
- Validation has no reverse operation; unlike the converters here it is one-way by its nature.
Questions about XML Validator
What does well-formed mean?
That the tags follow XML's structural rules: everything is closed, pairs match, and nothing overlaps. It is the baseline every parser requires.
Does it validate against a schema?
No. It checks well-formedness, not conformance to a DTD or XSD. A well-formed document can still break a schema's rules.
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