Syntax errors with line and column. Pretty-print with 4-space indent, or minify. XML Schema (XSD 1.0). Lint duplicate attributes and external DTDs. XML stays in your browser — nothing is uploaded.
Paste or type XML and get well-formedness errors with a line and column. Open a finding to jump to that spot in the editor.
Pretty-print with 4-space indent, or minify to a compact document. Formatting runs only when the document is well-formed XML.
Paste an XSD to check the document. Schema checks use XML Schema 1.0 in the browser. Remote schemaLocation values are not fetched.
Some parsers keep the last value for a duplicate attribute and skip external DTDs. This linter reports those problems.
Validation, formatting, and schema checks run on your device. Nothing is uploaded.
A document must have matching tags, quoted attributes, and one root element. Errors include line and column.
XML does not allow the same attribute twice on one element. The linter reports both occurrences.
External DTD and entity references are not fetched. Use the Schema panel with a local XSD.
Schema checks use XML Schema 1.0 in the browser. Remote imports are not loaded.
XML stays in the browser. Nothing is uploaded.