Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features. It´s 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.

Sumatra perform the following functions:

• 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

What´s new in version 1.9:

• support for CHM documents
• support touch gestures, available on Windows 7 or later. Contributed by Robert Prouse
• open linked audio and video files in an external media player
• improved support for PDF transparency groups