Add a number to every page of an assignment, report or scanned document — centre, left or right at the bottom. Your PDF never leaves your device; all the work happens in your browser.
No. Numbering happens inside your browser — no server, so it is safe for personal documents.
In a clear, standard size at the bottom of the page — the same on every page, so it looks professional in print.
No — a password-protected PDF must be unlocked first.