In PDFs, you can:
- Highlight both PDF text and typed text; highlights will stay with the text.
- Copy, paste, define, and speak selected text.
- Tap internal links and external links.
To make text boxes or start typing left-aligned text, tap-and-hold (iOS) or right-click (Mac) on blank space in a PDF. Tapping or clicking on top of PDF text will not make a text box.
At the moment, Notability cannot open password-protected PDFs.