The apparatus for separating folded and perforated or creased endless or reel papers, which form an uninterrupted stack, comprises a conveyor belt 9 conveying the same to a separating station, in order to permit an automatic separation of the stack into individual stacks 7a with a predetermined number of paper sheets. For this purpose, a separating sword 2 is moved preferably from below between the sheets of the stack, so that a stack 7a is formed with the desired number of individual sheets. The small cavity 10 running in the longitudinal direction and formed by the separating sword 2 is used for receiving a knife 4, which is moved at right angles over the stack, in order to separate the same at a perforation or fold. Pivotable removal bolts 1 are used for conveying away the separated stack 7a and for transfer to a second conveyor belt 5. The removal bolts 1 are then moved back into the starting position, so that the separating sword 2 can be extended out of the conveying area of the stack and a new separating process can be carried out. This permits an automatic separation into small stacks with predetermined numbers at virtually any random point.