Change Video Speed Online — Slow Motion & Fast Forward Free
Make slow motion out of an action shot or fast-forward a long process video: this tool changes playback speed from 0.25× to 3× and adjusts the audio tempo to match.
Video Speed Changer
Slow-mo drama or fast-forward energy — 0.25× to 3×, audio included.
1 Add your video file
2 Settings
3 Process & download
✅ Done — your video is ready
How to use it
- Add your video.
- Pick a speed — 0.5× for smooth slow-mo, 2–3× for process videos and timelapses.
- Process & download.
About this tool
Speed changes stretch or compress time itself: at 0.5× every second of action lasts two seconds, revealing detail your eye misses at full speed; at 3× an hour of work becomes a watchable twenty minutes. The audio tempo is adjusted with the same factor so voices and music stay in sync (pitch is preserved by the tempo algorithm, within reason).
True high-frame-rate slow motion (shot at 120/240 fps) looks smoother, but speed-ramping normal footage is how most viral slow-mo edits are made.
Frequently asked questions
Does the audio stay in sync? Yes — audio tempo is changed by the same factor. At extreme slowdowns voices will sound deep and strange, which is half the fun.
How long can the video be? Browser processing loves short clips — keep source videos under a couple of minutes for speed changes.
Are my videos uploaded? No — 100% in your browser.
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