Video · Change Speed

Speed up or slow down a video on Mac

Speed up or slow down, with the audio pitch kept natural.

Runs on your MacFFmpeg, one-click install

Three steps. That's it.

1
Drop your files
Drag files onto Change Speed, choose them with Choose Files, or right-click them in Finder.
2
Choose the options
Set what you need in the options panel, such as speed. Your choices are remembered for next time.
3
Get the result
The result lands in a new dated folder in Downloads › OneMacTools. Your originals are never changed.

What Change Speed does

Play a video at 0.25× to 4× speed. The audio is time-stretched so voices keep their natural pitch instead of sounding like chipmunks.

Uses FFmpeg, which OneMacTools installs for you with one click through Homebrew.

Options

Speed: 0.25×, 0.5×, 0.75×, 1.25×, 1.5×, 2× or 4×

Great for

Make a time-lapse from a long recording
Slow down a tutorial to follow along
Speed up a demo to fit a time slot

Questions about Change Speed

Does Change Speed upload my files?

No. Change Speed runs entirely on your Mac, so your files never leave it and it works offline.

Will Change Speed change my original files?

No. Results are saved as new files in a dated folder in Downloads › OneMacTools, and your originals are left exactly as they were unless you turn on an option that says otherwise.

What does Change Speed need?

macOS 26 or later and FFmpeg, which OneMacTools can install for you through Homebrew with one click.