Sumatra PDF - Best Open Source PDF Viewer

Sumatra PDF stands out as a prime example of open-source software excellence. It's a free PDF reader known for its minimalist design, ease of use, and impressive performance. Unlike many of its counterparts, Sumatra PDF is designed to be lightweight and fast, providing users with a no-frills experience that focuses on the essentials of PDF viewing.

One of the most significant advantages of Sumatra PDF is its speed. It launches quickly and opens documents in a snap, making it a favorite among users who value efficiency. This performance advantage is particularly noticeable when compared to some of the more bloated alternatives that are slow to start and cumbersome to navigate.

Another key feature of Sumatra PDF is its versatility. It supports a wide range of document formats beyond PDF, including ePub, MOBI, XPS, DjVu, CHM, and Comic Book files. This makes it an all-in-one solution for users who work with various types of digital documents.