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 known for its lightweight performance and open-source nature, making it ideal for quick viewing and basic annotations. In contrast, PDF-XChange Viewer offers a more feature-rich experience with advanced editing tools, making it better suited for users needing extensive PDF manipulation.