This article explains how to scan a document on a Mac using Image Capture. Instructions apply to macOS Big Sur through OS X Lion (10.7).

Turn on your all-in-one printer or standalone scanner and connect it to your Mac. Place a document, publication, or image you want to scan in the scanner. Do the following:

Open Image Capture on your Mac. Find the app in your Applications folder to launch it, or type Image Capture into the Spotlight search field.

Select your scanner from the panel on the left side of the main window. If you don't see your scanner, click Shared to view shared devices, then make your selection.