An image forming apparatus includes a feeder having a tray and configured to convey a sheet, a reader including a platen, an image forming unit configured to form a test pattern, and a controller. The controller adjusts, based on a result of reading the sheet having the test pattern formed thereon, a quality of an image to be formed by the image forming unit. In a case where a sheet of a first type having the test pattern formed thereon is placed on the tray, the feeder conveys the sheet. In a case where a sheet of a second type having the test pattern formed thereon is placed on the tray, the controller is configured to display a notification representing that the sheet is not to be conveyed by the feeder.