Short description of A-PDF Merger 4.6: A-PDF Merger is a simple, lightning-fast desktop utility program that lets you combine two or more image files or Acrobat PDF files into a single PDF document. A-PDF Merger provides special merge methods that allow you to combine documents and document parts in a number of different ways. Other features include the ability to combine bookmarks, adding watermark, change the Properties and security settings of the output PDF document etc.