Extract MP3 audio from MP4
on iPhone.

Sometimes you don't want the video at all — you want what's coming through the speaker. A live performance someone filmed, a recorded talk or webinar, a podcast that only went out as video, a sound effect buried in a clip: in each case the picture is just dead weight. Stripping the audio out as an MP3 gives you something you can drop into a music app, listen to with the screen off, queue up for the commute, or load onto any device that won't play video.

Filemorph reads the MP4 with Apple's AVFoundation — the same media framework behind the Camera and Photos apps — isolates the audio track and re-encodes it as an MP3 at the bitrate you choose. The video stays exactly as it was; you simply get a new, separate audio file alongside it. Because the work runs on your iPhone with a Live Activity tracking progress on the Lock Screen, there's no upload, no waiting on a server, and it all works offline.

Why extract MP4 audio to MP3?

An MP3 of the soundtrack is smaller, plays on absolutely everything, and lets you listen without staring at a screen — ideal for music, talks, lectures and interviews that happened to be filmed. It also frees the audio to be edited, set as a tone, or added to a playlist, none of which you can do while it's locked inside a video container.

Is it private?

Yes. Filemorph extracts the audio on your iPhone with Apple's AVFoundation, so the video — which may be personal footage — is never uploaded to a server. The whole operation runs locally and works with no internet connection, which also means you're not waiting to upload a large clip just to grab its sound.