Tiny Scanner is a nice application capable of turning your Android device into a portable scanner. Not only you can scan documents, but you can also use it to transform your receipts, photos, reports, and so on, into a digital format that can be stored on your phone's memory. Thanks to its simple to use interface, you can scan a piece of paper just by using the built-in camera of your device.
You can either perform scanning tasks in black and white, color, or grayscale, and save the output file as images or PDF files. A really nice thing about this software is its ability to detect page edges automatically and you won't have much fine tunning to do. Inside the friendly interface you can access all of your scanned files using the list or thumbnail view, and to sort them based on parameters like title and date.
Moreover, thanks to its search function you can now find target documents by looking after the proper title. In case some of these scanned documents are very important because they contain sensitive information, Tiny Scanner provides a features which lets you protect these files with a passcode. Everything that you scan using this application can be shared via email, Google Drive, Dropbox, Wi-Fi, and more.