Load your video, choose a speed multiplier between 0.25x and 4x, decide whether to keep the audio, and export the retimed clip.
By default the audio is resampled to match the new speed, which raises pitch when speeding up and lowers it when slowing down — like a classic tape effect. You can disable audio entirely if you prefer.
From 0.25x (four times slower, for smooth slow motion) up to 4x (four times faster, for timelapse-style clips).
Slowing down reuses existing frames rather than generating new ones between them, so very slow settings on low-frame-rate source footage can look less smooth than footage shot at a high frame rate.