What is Sumatra PDF?

Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows.

Sumatra PDF is powerful, small, portable and starts up very fast.

Simplicity of the user interface has a high priority.

is a PDF, EPUB, MOBI, CHM, XPS, DjVu, CBZ and CBR reader for Windows. It’s small and starts up fast. Simplicity of the user interface is important to us.

https://code.google.com/p/sumatrapdf/

Support for multiple languages

Introduction：

1. added facing, continuous and continuous facing viewing modes
2. remember history of opened files
3. ability to open encrypted files
4. should be more snappy because rendering is done in background and it caches one page ahead
5. handle URI links inside PDF documents
6. faster rendering thanks to alternative PDF rendering engine. Previous engine is available as well.
7. made it multi-lingual (20 translations contributed by many people)
8. moved the sources to Google Code project hosting
9. making Sumatra default PDF reader no longer asks for admin priviledges on Vista/Windows 7
10. zooming to 6400% no longer crashes
11. support for AES-256 encrypted PDF documents
12. add support for viewing CBZ and CBR comic books
13. support touch gestures, available on Windows 7 or later

Portable version

a single executable that can be run e.g. from USB drive and doesn’t write to registry.

Download Link