Video Speed Adjuster
Speed up or slow down a video.
Drop a video file
First load downloads the video engine (~30 MB)
About
Pick a multiplier (0.25x slow motion to 4x fast forward). Audio pitch is preserved by default. Useful for tutorial content, time lapses, or quick edits. Uses ffmpeg in your browser.
How to use
- Upload a video.
- Pick a speed multiplier.
- Process and download.
FAQ
Does the audio change pitch?+
No by default. Audio is time-stretched without changing pitch. Toggle the option if you want chipmunk-style audio at high speeds.
Why does extreme slow motion look choppy?+
Original frame rate. A 30 fps video slowed to 0.25x effectively plays at 7.5 fps. For real slow motion you need a high-fps source (120 or 240 fps).