A level shifter (100) is presented comprising an input branch (102) and an output branch (104). The input branch comprises a first switch (130), a voltage clamping unit (120) and a controllable current source (110) in series. The output branch (104) comprises a second switch (140) and a third switch (150) in series, the second switch (140) and third switch (150) having opposite polarities. An output (OUT, 160) is provided between the second and the third switch (140, 150). The current source (110) is controlled by an input signal (IN) and the output signal (OUT). The first switch (130) is controlled by the input signal (IN). Switching control terminals (122, 124) of the second and the third switch are connected on either side of the clamping unit (120). This reduces voltage swing of switching control units, thus resulting in fast switching, less power consumption and wider voltage ranges. The input branch (102) draws a current only during level transitions, enabling fast switching and power saving in steady state of the level shifter (100).