Add Music or Replace the Audio in a Video on Your Mac
Replace Audio puts a new soundtrack under a video. Choose an audio file, or use the sound from another video, then decide whether it loops to fill the whole video or plays once. A volume slider for the original audio lets you remove it entirely or keep it playing quietly underneath.
How to use Replace Audio
Open Replace Audio and drop the video whose sound you want to change.
Choose or drop the new audio file, or another video to take its sound.
Pick Loop to fit the video or Play once, then silence, and set the original audio volume.
Click Replace Audio and open the result in Downloads.
Questions about Replace Audio
How do I add background music to a video on Mac?
Drop the video into Replace Audio, choose a music file, and raise the Original audio slider if you want to keep the voices. Then click Replace Audio.
What happens if the music is shorter than the video?
Choose Loop to fit the video to repeat it until the end, or Play once, then silence to let it end naturally.
Can I remove the original sound completely?
Yes. Set the Original audio slider to zero and only the new audio is kept.
Related tools
72 Mac tools. One app. Pay once.
From $24.99 one-time · macOS 15 Sequoia or later
Buy Toolbox from $24.99