It won’t take you long before you hear the mention of PDFelement for Mac in a conversation or a task about PDF files. Top 10 Best Free PDF Readers for macOS 11 1. This article has sieved through the web and assembled the best free PDF readers for macOS 11 to use in 2021. However, sometimes you may need to enhance your PDF reading experience with a third-party tool. Currently, most of the operating systems have an in-built PDF reading tool. PDF files are not easily edited and can even be secured with password protection, thus preserving the integrity of the PDF file. PDF files can be accessed and are compatible with most of the operating systems without altering the formatting of the document. PDF files are the most prominent type of document file format.