Strip the hidden properties that identify you and your software
Usually more than people expect: your name or your organisation account name as the author, the exact software and version that made it, and creation and modification timestamps. Documents you share carry all of it.
No, and we will not claim it does. It clears document properties. It does not remove text, annotations, embedded files, JavaScript, or anything visible on the page - and the content itself can identify you. Use Redact PDF for content.
Editors leave private blocks on pages they have touched. They are harmless to drop and are one more thing identifying the software used.
Yes. Metadata is descriptive, not structural - removing it changes nothing about how the document renders.