This article presents the investigation on size reduction feasibility of planar Witricity device for biomedical implantable application. Biomedical implantable application demands for very small size device. Thus, the planar type of Witricity device is designed and investigated with the aim of size reduction. There are two designs presented in this article. Design A has larger size with an area dimension of 120 × 120 mm2 and capable for energy transferable distance of 50 mm. Meanwhile, another Witricity device, namely Design B has smaller size of 80 × 80 mm2 area is specified for approximately 40 mm transfer distance. The feasibility investigation on size reduction is observed from three main parameters; current distribution, coupling efficiency and return loss. The size reduction of 55% by Design B may lead to the reduction of 20% transfer distance but still with acceptable of 58% coupling efficiency at 40 mm that beneficial for biomedical applications.