Devices, methods, systems, and computer-readable media for an auto-tunable wireless charger are described herein. One or more embodiments include a tuner comprising a directional coupler connected between a frequency generator and a tuning cap to receive reflections on a transmit line of the directional coupler, and a controller coupled to the directional coupler and the tuning cap to monitor the reflections on the transmit line and to adjust the tuning cap based on the monitored reflections on the transmit line.