RepliGo Viewers is used for viewing of documents on mobile device or Windows desktop PC. It can annotate and fill out PDF forms from e-mails, flash drives, memory cards, via cloud services, and through the Internet. RepliGo can add highlights, cross outs, underlines, sticky notes, arrows, lines, ovals, rectangles, freehand drawings and text boxes into documents and is able to navigate through long documents with the use of bookmarks, document links, thumbnails and go to page. It also functions as an eBook reader with text, night mode, text-to speech and brightness settings. It can rotate documents in one of four orientations, open password protected files, send PDF through Bluetooth, e-mail or cloud services and it has keyboard and trackball support. Documents must first be converted into the RepliGo format through the RepliGo conversion so it can be distributed to other users who has the viewer installed on their Palm OS, Windows Mobile Pocket PC, Windows Mobile Smartphone, Nokia Series 60, Symbian UIQ, or Windows desktop PC.