Help & FAQ/Import guides
Apple Notes has no bulk export of its own, so the practical route on a Mac is the free Exporter app, which writes your notes out as Markdown. PrivacyNotes reads that export directly, including images.
Per-note zips shared from iOS (a small .zip containing the note's Markdown plus an Attachments folder) are accepted too: drop them in one at a time. For a whole library, the Mac route above is far faster.
Folder structure, note text, and embedded images survive the trip. Notes keep their titles, and attachments land in the encrypted file storage alongside their note.