Will slow motion look choppy?

Slowing down stretches the existing frames rather than inventing new ones, so at 0.25x the motion is noticeably steppier than the original. That is expected.

Does the audio change pitch?

No. Speed changes use a pitch-preserving algorithm, so voices keep their normal tone.

Are my files uploaded to a server?

No. Everything runs locally in your browser via WebAssembly. Files never leave your computer and are discarded when you close the page.

Do I need to sign up or pay?

No. The site is completely free, requires no account, has no usage limits and adds no watermarks.

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⏩Change Video Speed Online - Speed Up or Slow Down Video

Make a video faster or slower. The audio is retimed along with it and keeps its original pitch, so nobody sounds like a chipmunk. Pick 0.25x or 0.5x for slow motion, or 2x and above to tighten up a long screen recording.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Change Video Speed

1Upload a video file
2Pick a playback speed — the new duration is shown
3Click start and download the result

FAQ

Will slow motion look choppy?: Slowing down stretches the existing frames rather than inventing new ones, so at 0.25x the motion is noticeably steppier than the original. That is expected.
Does the audio change pitch?: No. Speed changes use a pitch-preserving algorithm, so voices keep their normal tone.
Are my files uploaded to a server?: No. Everything runs locally in your browser via WebAssembly. Files never leave your computer and are discarded when you close the page.
Do I need to sign up or pay?: No. The site is completely free, requires no account, has no usage limits and adds no watermarks.