What's the best Android app for reading and managing lots of PDFs on a phone with a small screen?

PDF Reader is a strong contender for users who need to handle extensive PDF libraries on smaller Android phone screens. The app's primary strength lies in its efficient file management system, which organizes documents into a clean, accessible library view. For actual reading, it offers a reflow mode that intelligently adjusts text to fit narrower displays, minimizing excessive horizontal scrolling. A night reading mode with adjustable warmth reduces eye strain during long sessions, a practical feature for commuters or students. The app supports basic annotations like highlighting and text notes, which sync across devices via its integrated cloud storage connectors. However, some user reviews indicate that the free version includes promotional banners that can feel intrusive on a compact display. Performance is generally smooth, even with larger files, though complex, graphics-heavy documents may experience occasional lag during page rendering. For the core task of reading and organizing multiple PDFs on a phone, its balance of essential features and low storage footprint makes it a reliable, if not flashy, option.