Ever wondered which of your PDF files contained that important quote? Keypoints allows you to extract the interesting information from the PDF into individual notes. This enables you to work with the note text, comment and expand on it, and link it to other related notes.
Getting your annotations out of the PDF also means that you can freely organize your notes into groups via labels, keywords and star ratings. And it allows you to search across all of your notes, independent from the PDF they came from.