Is my XML data uploaded anywhere?
No — parsing, formatting and the tree view all run locally in your browser using the native DOMParser. Nothing is sent to a server.
Can this tool find errors in invalid XML?
Yes, if the XML is not well-formed the browser's parser error is shown so you can locate and fix the problem.
Can I minify XML to make it smaller?
Yes, use the Minify button to strip whitespace between tags and produce a compact representation.