Video Speed Changer

Drag the speed slider (0.5–3x) to slow down or speed up playback, with audio synced and pitch preserved. Files are never uploaded.

Click to choose a video, or drag it here

Supports MP4 / WebM / MOV / MKV, etc.

Max file size is 2GB. Speed changes require re-encoding and take longer than trimming — please be patient.

Playback speed1.5x

0.5x slow1x normal3x fast

Keep audio and sync speed (uncheck for silent output)

The first run downloads an ~30MB engine, then it is cached. Dragging the slider previews at the current speed (no re-encoding); click “Generate” to export the sped-up or slowed-down video.