PDF Tools - Merge, Rotate, Split & PDF Utilities is a free Android application that enables users to modify PDF files. Developed by Puna Devops, the app offers a wide range of features such as splitting, merging, rotating, and deleting pages, adding text watermarks and passwords, and extracting and reordering pages. The user interface is simple and easy to navigate, making it accessible to users of all levels of expertise.

One of the standout features of PDF Tools - Merge, Rotate, Split & PDF Utilities is the ability to split PDF files into multiple documents by specifying page points, number of output files, or number of pages per file. Additionally, users can merge many PDFs into a single document, delete specific pages, and extract specific pages from a PDF file. The app also allows users to add text watermarks, headers, footers, and even page numbers, with options to change font type and transparency. Overall, PDF Tools - Merge, Rotate, Split & PDF Utilities is a comprehensive PDF modifier that offers a plethora of useful features for free.