StudentScan: Best PDF Scan for Books and Note is one of the most widely used photo to PDF scanner apps out there. Students simply love this app as it allows them to quickly capture photos on their books, notes, ID cards, documents and more, and transform them into reader-friendly PDF files. The app is absolutely free for Android users. It is easy to use and comprises a user-friendly interface. Now you don't need to stand in the queue at the xerox shop!