What's the best Android app for viewing PDFs and quickly scanning documents into PDF format?

PDF File Reader is positioned as a dual-purpose tool for users who need both a reliable document viewer and a basic scanning utility. The app's primary strength lies in its simplicity; it opens PDF files efficiently and offers standard navigation tools like zoom and text reflow for comfortable reading. Its built-in scanner allows users to capture physical documents using their phone's camera and convert them into PDFs, a practical feature for digitizing receipts, notes, or forms without needing a separate app. Specific features such as annotation tools for highlighting text or adding notes, along with a night reading mode, enhance its utility for students or professionals reviewing documents on the go.

However, the app's limitations are noted in user feedback. Its free version is supported by advertisements, which some reviews indicate can be intrusive, requiring users to watch ads to access certain functions. Performance can also vary, with occasional lag reported when handling very large or complex PDF files. Despite these drawbacks, for basic viewing and scanning needs, PDF File Reader delivers a functional, no-cost solution. Its straightforward interface makes it accessible for users who prioritize ease of use over advanced features like cloud integration or extensive editing suites.