Speed up a video or make it slow motion

Open the tool, drop in your video, and pick a speed. Choose 2x or 4x to speed it up, or 0.5x and 0.25x to slow it down for slow motion. When the new clip is ready, save it. It all happens in your browser, so there is no upload step and no account to create.

Five set steps: 0.25x and 0.5x for slow motion, 1x to leave the clip unchanged, and 2x or 4x to speed it up. The range runs from 0.25x to 4x, and you pick one of these set steps rather than typing your own number.

Yes. Set the speed to 0.5x for half speed or 0.25x for a quarter speed. Slow motion here repeats the frames your video already has rather than inventing new ones, so a very slow clip looks stepped rather than perfectly smooth.

Yes. The speed changer is free to use, with no sign-up, no trial, and no watermark on the result.

No. The work runs on your device with WebCodecs, so the video never leaves your browser and nothing is stored on a server.

The audio is removed, so the new clip is silent. Speeding sound up or slowing it down shifts its pitch, so the tool drops the track rather than distort it.

You get a WebM. This tool saves the re-timed clip as WebM, which plays in current browsers and in most current players and editors. If you specifically need an MP4, run the WebM through the Video converter afterward.

Yes. The tool runs in your phone browser, so it works on iPhone and Android with no app to install. Pick your video, choose a speed, and the WebM saves to your downloads or files.

No. The tool re-times the real frames your video already has; it does not generate, interpolate, or smooth anything. A fast clip is your footage played quicker, and slow motion is your footage held longer, frame by frame.