0.5× · 2× · 4×
Speed up or slow down a video
Make a long clip quicker to watch, turn a walk or drive into a mini time-lapse, or slow a moment down. Choose from 0.25× to 8×. The sound changes speed without turning into chipmunks or a growl, or you can drop it. The result is an H.264 MP4 that plays everywhere.
Private: your files never leave your device.
How to use Change video speed
Step 1: Add one or more videos.
Step 2: Pick a speed and choose whether to keep the sound.
Step 3: Press Start and download the new MP4 files.
Frequently asked questions
Will slow motion look smooth?
Slowing down repeats frames, so a normal 30 fps video at 0.5× looks a little stepped. Videos filmed at 60, 120 or 240 fps slow down smoothly.
Does the voice sound strange?
No — the audio is time-stretched, so the pitch stays natural. For very fast speeds you may prefer to remove the sound.
Is my video uploaded?
No. Everything runs in your browser with ffmpeg compiled to WebAssembly.