XML Formatter
Validate and indent XML documents locally, with helpful errors for malformed markup.
About XML Formatter
XML stores structured data in nested elements and attributes. Consistent indentation makes configuration files, feeds, and API responses easier to inspect, while checking tag pairs helps catch common malformed-markup mistakes.
This lightweight formatter checks tag nesting and basic markup structure, but it does not validate an XML document against a DTD, XSD, or application schema. It does not fetch external entities or transmit the document; use a schema-aware validator when conformance matters.
How to use this tool
Paste a well-formed XML document and choose Format XML. If the tool reports an error, check matching start and end tags, comments, and entity references.
Frequently asked questions
Does this validate against an XSD schema?
No. It checks basic well-formedness such as tag nesting. Schema validation requires the applicable DTD, XSD, or other validation rules.
Why does it reject an XML document with matching tags?
Unclosed comments, malformed markup, or invalid text outside tags can also make XML malformed. The message identifies common structural issues, but it is not a full XML parser diagnostic.
Are external XML resources loaded?
No external document or schema is fetched by this formatter. The input is processed locally in the page.
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