An image forming system includes a controller to discharge to a first discharger a sheet determined not to have a product defect and discharge to a second discharger a sheet determined to have a product defect. The controller is configured to, in a case where it is determined that a first sheet on which an image has been formed has the product defect, execute an adjustment operation of adjusting image forming conditions for an image former, and execute a recovery process in which the image formed on the first sheet is formed on a second sheet by the image former with the product defect removed based on completion of the adjustment operation.