Change Viewer does not require any additional software, does NOT require a network connection or install time. Just select a file and save it to your favorite PDF editing application. In addition, Change Viewer allows you to save one file per open document, to allow you to use the same file to view multiple PDF files while working.” (1)”Adobe PDF Viewer also has a similar feature set but uses a client-based application on a computer to interact with an online Adobe server that then runs the viewer and saves the view to your computer. It is a more technical solution but a simpler one. The cost however is much closer to Adobe PDF Viewer (which we do recommend).” ”Adobe Reader DC is much more powerful and also features several other useful features. You will certainly have to upgrade the software at some future point. If you would like to learn more to create PDF files, I would recommend Adobe PDF Viewer, but I have found several other software solutions for creating PDF files and viewing them.” (3)”For PDF's I'd strongly recommend the Adobe Reader DC. It's much quicker, more stable, easier to use, and supports many features that are not even available in Acrobat PDF Viewer.” (3)”I am very satisfied with Adobe Reader DC and its support as it has been my choice of PDF viewer for a long time (it is in my office computer bag).” (3)”I use Adobe Reader and in addition to this, I also use Adobe Acrobat Reader 2 to edit, annotate and sign PDF's. Adobe Reader and Acrobat do everything as each is very powerful and easy to use. I have no problems with compatibility and stability.”  Adobe Reader DC vs Open-Xchange Viewer — New York City — Open-Xchange Review New York Times Bestseller. “I am a professional PDF reader/writer/editor, and I love Adobe Reader DC. The new version of Viewer has great user interface, fast, well-documented editing (including auto-reflow, multiple document support), and the option for multiple files in one view. Plus, it's really fast.