Video Speed Changer
Instantly speed up or slow down videos (with synchronized audio). 100% secure local processing.
MP4, WEBM, MOV supported
Initializing FFmpeg Engine...
About The Video Speed Changer
Instantly speed up your video to create a timelapse, or slow it down to create a dramatic slow-motion effect.
Unlike standard players that just play the video faster, this tool permanently re-encodes the video file so it retains the new speed everywhere you share it (Discord, Instagram, TikTok).
It uses a complex FFmpeg filtergraph to perfectly synchronize the video framerate with the audio pitch shift.
How to Use
- Upload a video file.
- Drag the slider to your desired speed multiplier (0.5x to 2.0x).
- Click Apply Speed Multiplier.
- Preview your new video and download it.
Frequently Asked Questions
What happens to the audio?
The audio is automatically pitched up or pitched down to perfectly synchronize with the new video length. This prevents the audio track from becoming out of sync with the visuals.
Are my files uploaded to a server?
No. The video is processed securely inside your own device using WebAssembly.