A free program for Android, by Convertify.

The PDF Reader & PDF Viewer is an application that is used to view all the PDF files and books that are available on your mobile device. This application is user-friendly and can be used without any difficulty. This application is designed to work with all the most popular file formats.

The app features several ways to read a file such as Night Reading Mode, which is used for reading books at night. It is designed to help you read books without straining your eyes.