Adobe's free PDF reader has long been a standard for handling its extremely popular document format, but you aren't limited to using it to view. I've always been pretty big on the Foxit Reader because it's not only free, but it takes under 3 seconds to open up. The PDF viewer you choose is really dependent on what you need to do with the PDFs you download, but when it comes to viewing and editing. What the Sumatra PDF reader lacks in aesthetics—its interface is purposefully minimalist—it makes up for in fast rendering, even of graphics. IFilter Fast Search ! Trackers super fast IFilter is supplied FREE with all PDF- XChange Viewer installs and extracts and searches text from.