Private · on-device
Change Video Speed
Speed up or slow down a video from 0.25x to 4x with matching audio tempo when possible. Free and private in your browser.
mp4movwebmavimkv+5
▶MP4
Drag & drop files or Browse
MP4MOVWEBMAVIMKVFLVWMVM4V+2 more
Processed on your device. Nothing is uploaded
How to use Change Video Speed
- 01Add files
Choose files or drop them here
- 02Settings
Settings · Runs on your device
- 03Download
Processed on your device. Nothing is uploaded
Frequently asked questions
Does audio stay in sync?
Yes when the clip has an audio track. Tempo is adjusted with an atempo chain so pitch stays natural within FFmpeg limits.
Are my videos uploaded?
No. Speed changes run entirely in your browser.
Is Change Video Speed free?
Yes. Free with no limits, because processing runs on your own device.