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Change Video Speed

Speed up or slow down a video, from 0.25× to 8×.

Speed

MP4, MOV, WebM, MKV and 3GP, several at once

Drop more files anywhere on this page, or

    Runs on your device. No upload wait.

    What you get

    • Timelapse to slow motion
    • Natural sound

    Questions

    Is slow motion smooth?

    Slowing down repeats frames, so a 30 fps video at 0.5× shows each frame twice. For smooth slow motion, the video must be recorded at a high frame rate (like 120 or 240 fps on phones); playing that at 0.25× is smooth.

    What happens to the frame rate?

    It stays the same as the original: speeding up drops frames, slowing down repeats them. File size follows the new length.

    How long does it take?

    Copying without re-encoding takes seconds, even for long videos. Re-encoding runs at roughly real time or faster on a recent computer, using its video hardware; phones are slower.

    Are my videos uploaded anywhere?

    No. Your videos are opened and processed on your device, and the results are saved straight back to it. Nothing is uploaded. How to check.

    Is it free? Do I need an account?

    It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.

    Missing something, or not working as it should? Tell us