Change video speed
Make a video 2× faster, or slow it to half speed, from 0.25× to 4×. Voices keep their pitch, so nobody sounds like a chipmunk. Done on your device, so the video is never uploaded.
Runs in your browser. Your files are never uploaded or stored.
Video at the new speed
Something not working, or missing an option?
How to use Change video speed
- Choose or drop an MP4 or MOV video.
- Pick a speed; the page shows the new length.
- Change the speed, then play the result to check it.
Questions
Will voices sound like chipmunks?
No. The sound is sped up or slowed down without changing its pitch, so voices sound natural, just faster or slower.
Can I make smooth slow motion?
Slowing down doesn’t invent new frames. A video filmed at 30 frames a second, at half speed, shows 15 a second and looks a little jerky. Videos filmed in slow motion on a phone (120 or 240 fps) slow down smoothly.
Does it lose quality?
The video is encoded again in high-quality H.264 at its own size, so it looks the same.
Are my files uploaded?
No. The tool runs inside your browser, and the page is blocked from sending data anywhere. You can check by turning off your internet connection: it keeps working.
Open-source parts
- mp4-muxer MIT
More tools: Video and audio
Guides: How to speed up or slow down a video (without chipmunk voices)