MarginNote Pro for Mac
MarginNote is a highly powerful reading and study software and is applicable to Mac, iPad, and iPhone.
PDF tools
PDF Reader Pro for Mac
Building on solid features such as Annotation, Edit, Form filling, OCR, Convert, Create, Sign, Bookmark and protect your PDF files, PDF Reader Pro allows you to maneuver through your PDF files.
PDF Squeezer for Mac
PDF Squeezer is an easy-to-use PDF compression tool for Mac. It reduces the size of large PDF documents by compressing images and removing irrelevant information.
How to watermark your PDF on computer?
How to add watermarks to your PDF files using PDF Element on Windows PC or Mac?