Sumatra PDF is a free PDF, eBook (MOBI), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows. Sumatra PDF is small and starts up very fast. Simplicity of the user interface has a high priority. Portable version included (a single executable that can be run e.g. from USB drive and doesn't write to registry).
Sumatra PDF 3.2 changelog:
- upgraded core PDF parsing rendering to latest version of mupdf. Faster, less bugs.
- support for multiple windows
- improved management of favorites
- dropped support for Windows XP. Use 3.1.2 on XP.