The present invention relates to a method and a device for producing a planar implant (I) for a human or animal body, which planar implant (I) is preformed corresponding to a desired anatomical shape. The method comprises the following steps: making available a blank of the planar implant making available a preforming device (V) that comprises a plurality of discrete adjustable support elements (STE) for adjusting an associated plurality of support points in accordance with the desired anatomical shape defining the desired anatomical shape and determining corresponding settings for the support elements adjusting the support elements in accordance with the settings determined for the desired anatomical shape and producing the preformed implant by bending the blank onto the adjusted support elements.
