We think of Google Drive soley as a Cloud-based file repository. But when combined with the Google Drive app for Android or iOS, it turns your phone or tablet into a portable hand-held scanner. It can be used for receipts, full-page documents, or even multi-page documents.
The process is simple. Open the Drive app on your portable device, hit the scan button, and the app will fire up your device's camera and show you the image on screen. When your document is aligned using the on-screen grid, tap the on-screen button to take a photo. If you have a multi-page document, hit the + button to take a photo of the next page. When you are done, the photo(s) will be converted to a PDF "scan" of your document and automatically uploaded to your Google Drive.
The result will not be as good a running your document through a real scanner such as a Fujitsu ScanSnap, but it does a surprising good job.