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DigiSigner: free online PDF viewer java applet with additional function to digitally sign PDF documents. Docstoc: a web service which allows viewing PDF documents online. Issuu: a web service which allows viewing PDF documents online. Google Docs: a web service which views PDF documents as PNG images in the browser.

PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [3] [4] It runs on Linux, Windows and MacOS. [5] It comes in three versions: PDFtk Server ( open-source command-line tool), PDFtk Free ( freeware) and PDFtk Pro ( proprietary paid ). [2] It is able to concatenate, shuffle, split and rotate PDF ...

Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ).

PDF-XChange Viewer (now superseded by the PDF-XChange Editor) is a freemium PDF reader for Microsoft Windows. It supports saving PDF forms ( AcroForms) and importing or exporting form data in FDF/ XFDF format. Since version 2.5, there has been partial support for XFA, and exporting form data in XML Data Package (XDP) or XML format.