The invention relates to a folding method and a folder (1) comprising at least one multi-axial manipulator (2) which displaces a folding tool (5) relative to a workpiece (7), a corner folding unit (10) having a drive (26) of its own being arranged in one or more corner areas (8) of the workpiece (7). The manipulator (2) and the corner folding unit (10) are intercoupled for control, the corner folding unit (10) being controlled depending on the movements of the manipulator (2) and folding the corner areas on the workpiece, the straight or less curved areas of the web to be folded (40) being folded by the manipulator (2).