Change Video Speed

Speed videos up or slow them down, many at once, in your browser

Drop videos here

Or choose them: MP4, MOV, WebM, MKV and M4V; they stay in your browser, even long ones

Speed

Sound

2 times as fast: a minute plays in 0:30. The video is copied as it is, only its timing changed, so nothing is lost and it's quick. The sound is sped up with it, so it's higher too, as a tape played fast.

Saved in the same kind of file as each video (MP4, MOV, WebM or MKV; others as MP4). Sped up, a video has that many more frames a second (a 30 fps video at 4× plays at 120 fps); slowed down, fewer, so a slow-motion part looks smoothest from a phone's slow-motion recording. AVI, FLV and WMV aren't read.

How to speed up or slow down a video

Drop your videos on the page or choose them: MP4, MOV, WebM, MKV or M4V.
Pick the speed, from 0.25× to 4×.
Keep the sound, sped up or slowed down with the video, or remove it.
Download each video, or all of them in a ZIP archive.

Questions

Does changing the speed lower the quality?

No. The video is copied as it is, only its timing changes, so nothing is lost and it's quick.

What happens to the sound?

It's sped up or slowed down with the video, so it gets higher or lower, like a tape played fast or slow; or remove it.

How do I make a smooth slow-motion video?

Slowing down shows fewer frames a second, so slow motion looks smoothest from a phone's slow-motion recording (120 or 240 fps).

Which format do I get?

The same kind as each video: MP4, MOV, WebM or MKV (others as MP4). AVI, FLV and WMV can't be read.

Are my videos uploaded?

No. They're changed by your browser, on your device.