Video Speed Changer – Slow Motion & Fast
Speed up a video up to 4× or slow it down to 0.25× for slow motion, with the voice pitch kept natural. Saves as MP4.
About Video Speed Changer – Slow Motion & Fast
Mishra World Video Speed Changer makes a video faster or slower. Choose any speed between 0.25× and 4× with the slider or the quick buttons, and the preview plays at that speed straight away. Speed up long recordings, lectures and cooking clips, make time-lapse style videos, or slow down sports moments and dance steps.
With Keep voice pitch on, the sound is time-stretched so voices stay normal instead of sounding like chipmunks or slow robots; you can also remove the sound completely. The new length is shown before you start. Frames are decoded and encoded in your browser with WebCodecs into an MP4, usually faster than the video plays.
How to use Video Speed Changer – Slow Motion & Fast
- Drop a video (or try the sample).
- Pick a speed — the preview plays at that speed.
- Choose whether to keep the voice pitch or mute the sound.
- Click Change speed and download the MP4.
Frequently asked questions
Is slow motion smooth?
Frames are repeated, not invented, so 0.5× of a 30 fps video plays at an effective 15 new pictures per second. Footage shot at 60 fps or more gives the smoothest slow motion.
What does “Keep pitch” do?
It time-stretches the sound so voices keep their normal tone at the new speed. Without it, sped-up audio sounds higher (chipmunk) and slowed audio deeper.
How long does it take?
Every frame is decoded and re-encoded with WebCodecs, usually several times faster than the video plays.
How do I make a slow-motion video?
Drop the video, press 0.5× or 0.25× and click Change speed. Videos recorded at 60 fps or more give the smoothest slow motion.
How do I speed up a video 2×?
Drop the video, press 2× and click Change speed. An 8-minute video becomes 4 minutes long.
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