Change Video Speed
Speed up or slow down any video, from 0.25x to 4x — voices keep their natural pitch.
Runs in your browser. Your video is never uploaded.
Drop a video to change its speed
MP4, MOV, WebM or MKV. The result is an MP4.
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How to speed up or slow down a video
Drop a video above, choose a speed — or type your own, such as 1.25 — and press Change speed. The new duration appears before you start, so you know exactly what you will get. Speeds above 1 make the video faster and shorter; speeds below 1 make it slower and longer.
| Speed | A 60-second clip becomes | Good for |
|---|---|---|
| 0.25x | 4 minutes | Analysing a golf swing or a trick, from high-frame-rate footage |
| 0.5x | 2 minutes | Dramatic slow motion, following fast hand movements |
| 1.25x – 1.5x | 48 – 40 seconds | Tightening a talk or tutorial while keeping it natural |
| 2x | 30 seconds | Lectures, screen recordings, long walkthroughs |
| 4x | 15 seconds | Time-lapse feel: cooking, building, drawing, travel |
Why voices keep their pitch
The simple way to speed up audio is to play its samples faster, which raises every pitch with it — the chipmunk effect — and slowing down drags voices into a growl. This tool time-stretches instead. It cuts the sound into overlapping slices of about 40 milliseconds, re-spaces them for the new speed, and lines each slice up with the waveform of the one before so they join without warbling. The result is the same voice at a new pace, which is what you want for a tutorial, lecture or vlog. Extreme speeds such as 4x will still sound hurried and slightly grainy, because a lot of the sound has to be skipped, but speech stays recognisable.
If the sound does not matter — a time-lapse with music you plan to replace, for instance — chooseRemove sound, and add your own track later.
Smooth slow motion needs high-frame-rate footage
Slowing a video does not create new frames; it shows the existing ones for longer. A normal 30 fps clip at 0.5x plays at an effective 15 frames per second, and at 0.25x at 7.5, which looks jerky. Phones' slo-mo modes record at 120 or 240 fps precisely so they can be slowed down later — a 240 fps clip at 0.25x still plays at a smooth 60. The page warns you when your result will fall below 24 frames per second, the point where motion starts to look steppy.
Speeding up past 60 fps
At 4x, a 30 fps clip would need 120 frames every second. Most screens refresh 60 times a second, so half of those frames would never be seen but would still take up space. The tool keeps at most 60 frames per second and drops the rest, which keeps the file lean without any visible difference.
What you get
The result is an MP4 with H.264 video and AAC audio — the most widely playable combination there is. It is encoded with your device's hardware video encoder, so a several-minute clip usually takes well under real time. To change speed for only part of a video, firstsplit it or cut out the section, change that piece, and join the pieces back with the merge tool.
Frequently asked questions
Will voices sound like chipmunks when I speed a video up?
No. The audio is time-stretched rather than played faster, so speech at 2x is the same voice, quicker — not higher. The same is true in reverse: slowing to 0.5x makes speech slower without turning it into a deep drawl. If you would rather have no sound at all, choose Remove sound.
What speeds can I choose?
Anything from 0.25x (four times slower) to 4x (four times faster), using the presets or a custom value such as 1.25 or 1.75. The new length of the video is shown before you start.
Why does slow motion look choppy?
Slowing a video stretches the frames it already has over more time. A 30 fps clip at 0.5x plays at an effective 15 fps, and at 0.25x at 7.5 fps, which looks steppy. Smooth slow motion needs footage filmed at a high frame rate — 120 or 240 fps "slo-mo" from a phone slows down beautifully. This tool does not invent in-between frames, and the page warns you when the result will fall under 24 fps.
Does speeding up make the file smaller?
Usually, because a shorter video has less to store. When a clip is sped past 60 frames per second, frames are dropped rather than kept, since most screens cannot show more than 60 anyway — that keeps the file from carrying frames nobody would see.
What format is the result?
An MP4 with H.264 video and AAC audio, which plays on phones, computers, smart TVs and every social platform.
Is my video uploaded?
No. Everything happens in your browser tab, using your device's own video hardware. Nothing is sent to a server.