Secure PDF Viewer is an Android application developed by GrapheneOS that provides a secure and permission-free way to view PDF files. This simple yet effective app renders PDFs in a sandbox environment, keeping your device and data safe from potential threats. What's more, it doesn't require any permissions to work, ensuring your privacy and security.

The app's interface is minimalistic and straightforward, making it easy to use. It supports basic PDF viewing features such as zooming in and out, searching for text, and navigating through pages. The app also allows you to open PDF files from various sources such as email attachments, cloud storage, and local storage. Overall, Secure PDF Viewer is an excellent option for those who value their privacy and security while viewing PDF files on their Android devices.