The result answers one exact question
The report identifies XML version and root information for accepted input. It never implies that element names, attribute values, record counts, or domain rules are correct.
- Input
- XML
- Limit
- 1 MiB
- Runtime
- Browser
Check XML 1.0 well-formedness locally
Parse XML 1.0 syntax and report whether its document structure is well formed without claiming schema or business-rule validity.
Local processingNo sign-upNo network access
Validate XML
Inputs are limited to 1 MiB and stay in this browser tab.
Well-formedness report
Nothing is placed in a URL, account, or remote log.
What this tool does
XML 1.0, bounded, and local
A well-formed document obeys XML syntax: it has one document element, properly nested tags, quoted attributes, legal characters, and valid namespace usage. That is narrower than validation against XSD, RELAX NG, or an application contract.
External processing is excluded
The parser rejects DTD declarations and does not resolve external entities, schemas, stylesheets, XInclude targets, URLs, or local files.
Primary references
Questions and answers
Related XML tools
XML FormatterParse one XML 1.0 document and produce readable indentation without treating text-bearing mixed content as disposable layout.XML Namespace InspectorInventory default and prefixed namespace bindings and show how qualified element and attribute names resolve through the document tree.XML ComparatorParse two XML documents and report bounded path-level structural changes rather than treating every formatting difference as a content change.