It works under Microsoft Windows, and is free for sumatra pdf viewer review-commercial use. STDU Viewer has a tabbed document interface. Current versions allow users to save and restore sessions manually.
It displays thumbnails of pages, it can create users’ bookmarks, make color adjustments, and change text settings. The program supports three types of search algorithms and all the search results can be displayed in a list.
The rotation to 90 degrees option is useful for the portrait orientation of monitors. The opened document pages can be exported to text or image. The first STDU Viewer was version 1. 60, released on 13 September 2007.