Extract audio from a video file. Every conversion runs locally on your Mac — your MP4 files are never uploaded.
macOS 14 or later · Apple silicon · Free to try
MP4 is the universal video format that plays on virtually every device. MP3 is the universally supported compressed audio format. Extract audio from a video file.
PrivateRemix handles the MP4-to-MP3 conversion in a couple of clicks, with the result saved right next to your original file.
Unlike free online converters, PrivateRemix has no server. Your MP4 files stay on your Mac — no upload, no cloud, no account.
Drag a MP4 file into PrivateRemix, or pick one from your Mac.
Select MP3 from the formats PrivateRemix offers for your file.
The new MP3 appears next to the original. Nothing leaves your Mac.
The change is minimal. Both formats are compressed, and PrivateRemix converts at a high quality setting so there is no visible or audible drop for everyday use.
For sharing and playback, yes — MP4 is supported by nearly every phone, TV, browser and editor, which is why it's the safe default.
Effectively yes. MP3 is the most widely supported audio format in the world, which is why it's the go-to for sharing.
No. PrivateRemix runs entirely on your Mac using its own processor. Your MP4 files never leave the device — there is no server to upload to, and it works fully offline.
Yes. Drop in a batch of MP4 files and PrivateRemix converts them all locally, saving each new MP3 next to its original.
Free to try. macOS 14 or later, Apple silicon.