A method for controlling or regulating a folder of a printing press in which at least one fold control mark is printed onto a printed copy or a printing material of the printed copy. The at least one printed fold control mark is measured and at least one fold actual measured value is compared with a corresponding fold setpoint value. The folder is then set automatically as a function of the comparison between the fold actual measured value and the fold setpoint value, such that the fold actual measured value corresponds to the fold setpoint value or is approximated to it in subsequent printed copies.