It was in 1948 that Wilhelm Karmann first bought a VW Beetle sedan and converted it into a four-seated convertible. After successfully presenting it at VW in Wolfsburg the Beetle Cabriolet began production in 1949 by Karmann in Osnabrück.

The convertible was more than a Beetle with a folding top. To compensate for the strength lost in removing the roof, the sills were reinforced with welded U-channel rails, a transverse beam was fitted below the front edge of the rear seat cushion, and the side cowl-panels below the instrument panel were double-wall. In addition, the lower corners of the door apertures had welded-in curved gussets, and the doors had secondary alignment wedges at the B-pillar.

The top was cabriolet-style with a full inner headliner hiding the folding mechanism and crossbars. In between the two top layers was 1 in (25 mm) of insulation. The rear window was tempered safety glass, and after 1968, heated. Due to the thickness of the top, it remained quite tall when folded. To enable the driver to see over the lowered top, the inside rearview was mounted on an offset pivot. By twisting the mirror 180 degrees on a longitudinal axis, the mirror glass would raise approximately 2 in (5.1 cm).