An apparatus for perfect binding of unbound print products to form bound print products comprises at least one processing station arranged along a circulating path between a feed station for the unbound print products and a delivery station for the bound print products, and a plurality of clamping devices arranged successively along the circulating path and driven jointly. Each of the clamping devices is adapted to hold at least two of the unbound print products such that the unbound print products face the processing station with overhangs that freely project from the clamping device and form spines of the unbound print products.