Popular free PDF readers include Adobe Acrobat Reader DC, Foxit Reader, Lumin PDF and Evince. All of these are available for downloading online. Specific features such as multi-platform support and cloud-based access vary among different PDF readers.
Adobe Acrobat Reader DC allows users to view and annotate PDFs on multiple devices by linking PDFs to the Adobe Document Cloud. Foxit Reader provides a highly secure way to view and create PDFs. Lumin PDF is a Google Chrome extension that easily links to Dropbox, Google Drive and other cloud storage programs. Evince is an open-source document reader with support for PDFs and many other file formats.