Videos
Shrink and convert clips for easy sharing.
Change video speed
Speed up or slow down a video — from 0.25× to 4×, with the sound kept in step. Free, on your device.
- Runs on your device
- Private by design
- Free
Drop a video here
or click to choose · MP4, MOV, WebM, MKV…
How to change a video's speed
Add your video
Drop in an MP4, MOV or WebM clip.
Pick a speed
0.25×, 0.5× or 0.75× to slow it down; 1.25× up to 4× to speed it up.
Sound
Keep the audio — it's sped up or slowed down without turning into chipmunk voices — or mute it.
Download
Save the new MP4.
Frequently asked questions
- Will the voices sound high-pitched?
- No — the audio tempo changes but the pitch is kept, so voices still sound natural.
- Is slow motion smooth?
- Frames are stretched, not invented, so very slow speeds (0.25×) look smoothest on clips filmed at 60 fps or more.
- Is my video uploaded?
- No. It's processed in your browser — your video never leaves your device.