Sumatra PDF is a conventional computer application that lets you open and read PDF files. It is a suitable PDF reader for beginners as it offers limited features and helps new users to read eBooks and PDF files without getting confused. It is an open source PDF reader that is available with GNU General Public License for free. It can work on Windows PCs. Since its first release in June 2006, it has been updated multiple times for adding advanced features by two developers. It can be installed or used as a portable application.