Change the speed of a video
Speed up a long screen recording, slow down a tricky move, or make a timelapse feel smoother. The sound is stretched without the chipmunk effect, so voices stay natural.
Your files never leave your browser
How to use
- 1
Choose the speed: 0.5× and 0.75× to slow down, 1.25× to 2× to speed up.
- 2
Drop your video into the box.
- 3
Download the result as an MP4.
FAQ
Does the voice sound high-pitched when sped up?
No. The audio is time-stretched with its pitch preserved, so speech at 1.5× sounds like a fast talker, not a cartoon.
Is the video uploaded?
No. FFmpeg runs in your browser as WebAssembly; the video never leaves your device.
How long does it take?
The video is re-encoded, which takes roughly as long as the clip on a laptop. Slowing down takes longer, because the result itself is longer.
What about videos without sound?
They work too; the result simply has no audio track.
Can I speed up just part of a video?
Not in one step: cut the part out with Trim video, change its speed, then join the pieces with Merge videos.