Cannot export multiple notes from Notes App

Since the Apple Notes app deliberately lacks a native "Export All" button, the most effective workaround for creating universally readable backups is to use the free Shortcuts app to automate the process. You can build a simple shortcut by adding the "Find Notes" action, feeding that into a "Repeat with Each" loop, and placing "Make PDF" and "Save File" actions inside that loop; this will automatically generate and save a separate PDF for every single note in your library.

For Mac users specifically, a third-party app called Exporter is a better option if you need to migrate data to another platform, as it converts notes into clean Markdown or HTML files. Alternatively, if you just need the files quickly and don't mind the format, you can simply select all your notes on an iPad or Mac and drag and drop them into a folder, though this usually saves them as .rtfd files which can be difficult to open on non-Apple devices.