Reflow minified or messy XML into clean, indented markup that's easy to follow — ideal for config files, feeds and SOAP payloads. It runs entirely in your browser, so the document is never uploaded.
XML Formatter is a quick, no-nonsense developer utility that runs entirely client-side, so your code and data never leave your machine.
It formats for readability; use XML to JSON to catch parse errors.
Yes, that is a common use.
No — it runs in your browser.