We report on the operation and performance of a gain-switched Er:ZBLAN fiber laser based on an active pulsed diode pump system. The produced laser pulses offer high peak powers while retaining the high average powers and efficiency of the cw regime. The measured pulse duration was about $300\mathrm{ns}$ and nearly independent of the pump repetition frequency. The maximum obtained $68\mathrm{W}$ of peak power is the highest reported, to our knowledge, for diode-pumped Er:ZBLAN fiber lasers, and the $2\mathrm{W}$ of average power at the repetition frequency of $100\mathrm{kHz}$ is 2 orders of magnitude higher than previously reported average power in a pulsed regime. The obtained slope efficiency was 34%.