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

Sumatra was designed for portable use, as it consists of one single file with no external dependencies, making it usable from an external USB drive. As is characteristic of many portable applications, Sumatra takes up little disk space.Sumatra does not lock the PDF file. Without closing the PDF file, a user can save over the PDF and then press the R key to refresh the PDF document. 


Note: This program is advertising supported and may offer
to install third party programs that are not required.
These may include a toolbar, changing your homepage,
default search engine or installing other party programs.
Please watch the installation carefully to opt out.