PDF Reader 6 Premium for iPad offers users to add shapes.
1. Go to the page where you want to add shapes; tap and hold "Shapes" icon at the navigation bar.
2. You can set the color and the shape (Line, Arrow, Square and Circle) of the markups at the same time. Tap anywhere on the page to save settings.
3. Tap an area on the page and the preset shape will be immediately added to the spot you just tapped.
4. You can adjust the size and position of the shape by tapping the markup. You can also choose to delete it.
△ Attention: Files within the "Inbox" folder are not allowed to be annotated. Please move the files to other folders to annotate them.