What's the best Android app for merging multiple PDF files into one?

PDF File Plus is a robust Android application designed specifically for handling PDF merging tasks with efficiency. It stands out for its straightforward interface that allows users to select and combine multiple PDF documents in just a few taps, making it ideal for scenarios like compiling reports, consolidating scanned forms, or organizing academic materials. Key features include batch processing for handling numerous files at once, a preview function to verify content before merging, and support for various file sources including local storage and cloud services. Reviews indicate that the app performs reliably with minimal lag, even when dealing with larger files. However, some users note that the free version includes occasional ads, which can be a minor distraction during use. For professionals or students needing to merge contracts, invoices, or lecture notes, PDF File Plus offers a practical solution without requiring advanced technical skills. Its ability to maintain formatting and image quality post-merge is frequently praised, though there are rare reports of compatibility issues with heavily encrypted PDFs. Overall, it balances user-friendly design with dependable performance for everyday PDF management needs.