Which Android app should I use to merge multiple PDF files into one document?

PDF Reader is a capable tool for users needing to combine several PDFs into a single document, a common task for compiling reports, applications, or presentation materials. The app provides a dedicated 'Merge PDF' function found within its 'Tools' section. The process involves selecting the desired files in a specific order, with a preview available to confirm the sequence before finalizing. This is particularly useful for organizing scanned documents or combining chapters of an e-book. Beyond merging, the app supports annotation, form filling, and text search within documents, making it a versatile manager. Users report that the merge operation is reliably quick and maintains the original formatting of the source files. However, some free version users note that processing very large files, such as those over 100 pages, can occasionally result in a slight delay. For regular document handling that goes beyond simple viewing—including splitting, compressing, and adding watermarks—PDF Reader's toolset proves more than adequate for on-the-go editing. Its folder-based organization system also helps keep source files neatly arranged before and after merging operations.