PDF Reader s by Kdan Mobile is one of my favorites to use with the iOS platform. Editing and annotating with this particular reader is easy and the app also works well on both iPad and iPhone so switching from one device to another to continue working on the same file is a smooth process. You can also scan to PDF - it a great way to reduce paper clutter and have all your documents on the cloud for easy access. Here are some of the other tools available Markup Insert photos Add hypers Create forms Edit PDF pages Compress andbine PDFs Lock your documents Night mode Slideshow mode Overall this app is intuitive easy to use and a great way to take care of all your PDF editing needs. Disclaimer I am part of Kdan team and my answers might be a bit biased.