Sumatra PDF is a slim, free, open-source PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI/FB2 viewer for Windows.
Why another PDF reader?

Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features.

Its small and starts up very fast.

Its designed for portable use: its just one file with no external dependencies so you can easily run it from external USB drive.

SumatraPDF

Windows

PortableApps.com

<p>Sumatra PDF is a slim, free, open-source PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI/FB2 viewer for Windows.Why another PDF reader?</p>

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