Smart Scan Document Scanner is a free Android app developed by universeapps under the Business & Productivity category. This app offers an efficient way of scanning paper documents such as receipts, notes, whiteboard discussions, business cards, certificates, etc. and turning them into PDF documents.

One of the best features of Smart Scan is its ability to automatically detect the corners of the document frame and perspective crop the image. Additionally, the app uses OCR (optical character recognition) to extract texts inside document images. This makes it easy to search, name, and organize documents. Users can also enhance the image and convert it to grayscale or black and white.

Another useful feature is the ability to draw or highlight over the image. Once scanned, users can export and share their scans as PDF or JPG files. The app also includes an "Email to myself" feature that lets you send documents to a predefined email address. Finally, Smart Scan offers the ability to back up and restore documents, making it easy to access important documents on multiple devices.

Overall, Smart Scan Document Scanner is a valuable tool for anyone who needs to digitize their paper documents and keep them organized.