It has small space saving storage space on the device. This program is very useful for my learning, easily to use for me. It has the function OCR (Optical Character ) help to search all text within a document PDF saves time editing my job a lot. In the document management have many options to choose. If I want to view the document PDF, I can zoom in zoom out to scroll left and right and pan view documents quickly. I can Highlights the important text, drawing into the document, put a comment , put stickers note, export PDF to file pictures and I can use support the wide variety of languages including English, French, German, Spanish and other languages. This is a great program, it make me do not confusing to use and I can create reports quickly.