MuPDF is a free and open-source software framework written in C that implements a PDF, XPS, and EPUB parsing and rendering engine. It is used primarily to render pages into bitmaps, but also provides support for other operations such as searching and listing the table of contents and hyperlinks. Developed by Artifex Software, Inc.
License: Open Source
MuPDF is primarily a lightweight PDF viewer and annotation tool, best suited for users needing fast document access and security features. In contrast, Google Docs Viewer excels in collaborative document editing and integration with cloud services, making it ideal for teams and users looking for a robust editing experience.