A printing apparatus includes a storing unit, a printing unit, a receiving unit, and a controlling unit. The storing unit stores a size of a sheet. The printing unit prints an image on the sheet based on a specified print job sheet size. The receiving unit is configured to receive, from a user and before the printing, an instruction for notifying the user of an error where the specified print job sheet size does not match the stored sheet size. If the receiving unit receives the instructions and the specified print job sheet size does not match the stored sheet size, the user is notified of the error and the printing unit executes printing. If the receiving unit does not receive the instruction and the specified print job sheet size does not match the stored sheet size, the printing unit executes printing without notifying the user of the error.