STDU Viewer Reviews

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Fast and reliable, but no editing or commenting.
Opens 50 pdfs without a sweat, adobe often crashes with five.
Tabbed documents. Utilitarian interface. Session restore. Portable version.
Active development. Free for home and education. No bullshit. Recommendable.

Update May 2018:
It seems STDU Viewer is no longer in active development; their news page says last updated in Apr 2015.
There is a rare bug where sometimes after scrolling a page fails to render.

I still believe this is the best option if all you need is a viewer.
Zoom level "Fit width (advanced)", brightness controls, and regex search are rare features.
It also has highlighting and bookmarks, but consider Citavi instead if want those kinds of features.


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This is the best program for viewing documents on Windows. Lightweight RAM, perfect stability, easy settings, support for a huge number of formats. Unfortunately, it is not developed and abandoned as of an 2020..