Genius PDF Join or Merge is an easy-to-use app that will help you join multiple PDF files into one. Just add the PDF documents that you want to merge, and then click "Merge" button. After merging, the program displays the merged PDF file. Genius PDF Join or Merge has an intuitive user interface and a well-thought-out design. It performs only one task, but does it quickly and without any problems. It is a lifesaver for users working with large numbers of PDF documents.