The invention pertains to a device for processing printed matter, in particular, for punching, perforating, grooving, embossing, imprinting, spot-coating or the like. In order to simplify the attachment of the processing tools required for the additional processing, the invention proposes that a carrier be attached to a rotating or flat working element 8. The processing tools can be attached to this carrier such that they can be easily removed again. The size of the processing tools 3 that, for example, are provided with punching lines 4 can be limited to the processing area. The processing tools can be removed and also easily repositioned at any time. A magnetic attachment proved particularly advantageous. For this purpose, the carrier may be realized in the form of a magnetic foil 6.