Change the speed of a video
Make a video play faster or slower, from a quarter of the speed to four times. The sound can follow along or be removed. Everything runs on your own computer.
- Never uploaded
- No size limit
- No watermark
- Free
Keep this tab open and in front. Browsers slow down background tabs.
Quick answer: To change the speed of a video, drop it into the tool at the top of this page, pick a speed from 0.25× (slow motion) to 4× (fast) and press "Change speed". The sound can stay in step at the same voice pitch, or be removed. It happens in your browser, so the video is never uploaded. It is free, with no sign-up and no watermark.
Updated
How it works
- Drop your videoMP4, MOV, WEBM or MKV. It stays on your computer.
- Pick the speedChoose 0.25× to 4×, or type your own. You see the new length before you start.
- Change and downloadKeep the sound in step, or tick the box to remove it.
How long the clip becomes
A speed of 2× halves the length; 0.5× doubles it. For a one-minute clip:
| Speed | New length |
|---|---|
| 0.25× | 4 min |
| 0.5× | 2 min |
| 1.5× | 40 s |
| 2× | 30 s |
| 3× | 20 s |
| 4× | 15 s |
Slow motion: what to expect
Slowing a normal video repeats pictures to stretch it, so it can look a little steppy. It does not add detail that was never recorded. Footage shot at a high frame rate has more pictures per second, so it slows down more smoothly.
What happens to the sound
With "Keep the sound" ticked, the sound is sped up or slowed down with the picture, but voices keep their pitch, so a clip at 2× does not sound like a chipmunk. Untick it to remove the sound, which suits a timelapse or a slow-motion clip where a slowed-down voice would only get in the way. A video with no sound is changed as it is.
Measured, not promised
Timed on 21 Oct 2026 in Chrome on a 2019 Intel MacBook (an older laptop) with a one-minute 720p clip with spoken sound. Newer computers are faster; real files vary. More results.
Why your video never leaves your computer
Your video is processed by your own computer, inside this tab, and never uploaded. That is why there is no size limit and no watermark. How it works.
Questions
Is the sound sped up too?
Yes, unless you untick it. It stays in step with the picture, with the same voice pitch.
How slow can I make a video?
A quarter of the speed (0.25×), so a one-minute clip becomes four minutes.
Does slow motion make the video smoother?
No. It repeats pictures to stretch the clip; it does not add detail.
Is my video uploaded?
No. It is processed inside this browser tab and saved straight back to your computer.