If you don't have a scanner and need to scan a document now, you can do it with your smartphone/tablet. Camscanner is an app that turns the camera of these devices into scanners. It's very easy to use, and it also offers tools that significantly improve the quality of the files.
To scan documents with Camscanner, simply activate the app, point the camera at the desired document, and capture it. On the app's screen, a selection area will show how your document will appear.