Create a quick timelapse or dramatic slow motion. Choose a speed from 0.25× to 4×; the audio is time-stretched so voices keep their natural pitch.
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Your files are processed on this device and are never uploaded to a server.
How to use the Change Video Speed
1
Choose a video.
2
Pick the speed.
3
Convert and download.
Audio pitch
Audio is processed with a tempo filter that changes speed without making voices sound like chipmunks. You can also drop the audio entirely.
Frequently asked questions
Is my video uploaded?
No. Processing uses FFmpeg compiled to WebAssembly and runs entirely in your browser. Your files never leave your device.
Why is it slower than desktop software?
Browser processing runs on a single CPU thread without hardware encoders. Short clips finish quickly; for long 4K videos, reducing the resolution to 1080p or 720p speeds things up considerably.