PDF Expert is a tool using to perform many tasks over a pdf file developed by Readdle. It is available for macOS and iOS. At the time of its launch, it was only compatible with the iPad. This tool allows you to edit and create PDF files, As well as, you can merge many pdf files into a single document. You annotate and sign contracts in this software as well. It can also secure your files for you so that it’s not accessible by any unwanted people. Reviewing pages in it are pretty convenient. You can review a lot of pages in a single time of a document. It becomes more easy with the split-view mode in it. Editing images and adding links are some other features available in it.