I have a Samsung Galaxy Note phone, and installed Google Drive App. I can scan my important documents (even a book) into PDF and upload to my Google Drive. Google Drive Scan Google Drive App Scan is a REAL intelligent scan, unlike some apps which just take pictures and convert them into PDF, it can actually recognize text areas, and trim and format your picture to fit into a page nicely and neatly, even though the picture may have a large corner where your fingers holding on! I have some Chinese classic Books, which has a square border to mark the text area, two frames in one page, I just roughly aim my camera at the frame, the scanner only take the picture inside the frame, cutting away the rest along the border. You can get better result to turn on the flash light, the light stays on like that in a scanner, not a click flashing as it does when you take a photo. Google Drive Scan Can Recognize the Text Area and Trim Along the Border For You Nicely
Lost in the Digital Land, Leaves behind Footprints on the Sands of Time.