Sumatra PDF是由Krzysztof Kowalczyk所开发的轻量级PDF阅读器，属于开源软件，提供安装版和携带版，同时还允许源码下载。Sumatra PDF的设计风格极简单。
SumatraPDF 2.1 更新内容：
1.support for EPUB ebook format
2.added File/Rename menu item to rename currently viewed file (contributed by Vasily Fomin)
3.support multi-page TIFF files
4.support TGA images
5.support for some comic book (CBZ) metadata
6.support JPEG XR images (available on Windows Vista or later, for Windows XP the Windows Imaging Component has to be installed)
7.the installer is now signed
支持运行环境：Windows XP/Vista/Windows7
Sumatra PDF 2.1 安装版 官方下载：
（4.21MB）
（2.33MB）