Sumatra PDF is a free, slim, open-source PDF viewer that does what any other pdf viewer does. It's small size and low memory consumtion makes it an ideal program for older systems.

Sumatra has a minimalistic design, small and starts up very fast. It's designed for portable use: it's just one file with no external dependencies so you can easily run it from external USB drive.



Here are some key features of "Sumatra PDF":

· open PDF files via menu
· open PDF files via drag & drop
· page up and 'p' for going to previous page
· page down and 'n' for going to next page
· q' to quit
· set different zoom levels via menu