Video · Replace Audio

Replace the audio in a video on Mac

Swap a video's soundtrack for another audio file.

Runs on your MacFFmpeg, one-click install

Three steps. That's it.

1
Drop your files
Drag files onto Replace Audio, 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 stop at the shorter of the two. 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 Replace Audio does

Drop a video and an audio file. The picture is kept untouched and the new soundtrack is laid over it, stopping at whichever is shorter if you like.

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

Options

Stop at the shorter of the two

Great for

Add music to a holiday montage
Replace a noisy soundtrack with a clean voice-over
Dub a demo with narration

Questions about Replace Audio

Does Replace Audio upload my files?

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

Will Replace Audio 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 Replace Audio need?

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