Video Speed Changer
Speed up or slow down your video. Preview the change, then save it to your device.
Browser tool
MP4, MOV, M4V or WebM · Up to 200 MB, 60 minutes and 4K
Processed on your device. Nothing is uploaded.
About Video Speed Changer
Speeding a clip up or slowing it down. Speeding up suits a tutorial with long pauses or a time-lapse; slowing down suits showing a detail that happens too quickly to follow. Free, online, and no sign up: the clip is re-timed in your browser, which means it is never uploaded and never watermarked.
How to use Video Speed Changer
- Open the videoDecoded and re-timed locally, which is what you want for anything not yet released.
- Choose a speedPreview it before exporting — what reads as brisk at 1.5x can read as frantic at 2x.
- Export the adjusted clipSaved as a new file; the original is untouched.
Speeding up is cheap, slowing down is not
Playing a clip faster discards frames, which is straightforward and looks fine — a two-times tutorial is perfectly watchable. Playing it slower has to invent time that was never recorded, and the only honest options are repeating frames, which judders, or interpolating between them, which smears. This asymmetry is why time-lapse is easy and genuine slow motion has to be filmed at a high frame rate in the first place.
What it does not do
- Slowing footage down does not create frames that were never captured, so heavily slowed video looks juddery rather than smooth. Genuine slow motion has to be filmed at a high frame rate.
- The audio keeps its pitch, but at extreme speeds speech can sound clipped or smeared; remove the sound if it is not needed.
- It takes longer than desktop software would, and that is the price of the file staying put.
Video Speed Changer: questions people ask
- Why does my slowed-down video look choppy?
- Because the frames do not exist. A clip shot at 30fps played at half speed shows each frame twice, which reads as judder. Smooth slow motion requires filming at a high frame rate in the first place.
- What happens to the audio?
- It is sped up or slowed down together with the picture and stays in sync. If the sound is not needed at all, removing it first gives a smaller file.
- Can I change video speed without changing the pitch?
- Yes. The audio is time-stretched with FFmpeg's atempo filter, so voices keep their normal pitch while staying in sync with the faster or slower picture. Speeds from 0.25x to 4x are supported, as presets or typed in.
Questions about ToolsVerse itself — privacy, cost, what happens to your files — are answered in the frequently asked questions.
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