Sometimes you only want the sound: the music behind a clip, the voice in an interview, the audio of a lecture you recorded as video. Rather than carry the whole heavy video around, you can pull out just the soundtrack and save it as an audio file — all on your iPhone, without uploading the clip anywhere.
A video file is really two streams woven together: the picture and the sound. Extracting audio just means lifting out that sound stream and writing it to its own file. People do it for all sorts of reasons — turning a recorded talk into something you can listen to on a walk, saving a song from a clip, grabbing a voice memo you accidentally captured as video, or pulling narration out of a tutorial. In every case the goal is the same: keep the audio, lose the video weight.
The good news is your iPhone is well equipped for this. AVFoundation, the media framework Apple ships with iOS, can read the audio track straight from a video and re-encode it to a standard audio format on the device itself. No upload, no waiting on a server — and your original clip, which may be personal, never leaves your phone.
For the widest compatibility, extract to MP3 — it plays on essentially every device, car stereo and app. If you specifically want to pull the soundtrack out as MP3, the dedicated MP4 to MP3 page walks through that exact case. Bitrate is your size-versus-quality dial: 128 kbps is plenty for spoken-word audio like interviews and lectures, while 256 to 320 kbps keeps music sounding rich. Choose lower for voice, higher for music.
Extraction works on a copy and produces a separate audio file; it doesn't modify or delete the source video. So you end up with both — the full clip and a standalone audio track — and you can remove either one whenever you like. There's no risk to the original in trying it.
Once you're working with the sound on its own, the audio studio can trim it, normalise the volume, change the speed, or convert it to another format. And if you want to do more with the clip itself — compress it, trim it, or transcode it for sharing — the video tools cover that too. Extracting audio is a Pro feature, and like everything in Filemorph it runs entirely on your iPhone with no upload, no account and full offline support.
MP3 is the safest choice for compatibility — it plays on virtually every device and app. If you want a smaller file, a lower bitrate works fine for spoken-word audio, while 256 to 320 kbps keeps music sounding good.
Extraction creates a new audio file from a copy and leaves your original video untouched. The video itself isn't altered. You're simply saving its soundtrack as a separate file.
Yes. Audio and video conversion, including extracting a soundtrack to MP3, is part of Filemorph Pro. It still runs entirely on your iPhone with no upload, and a Live Activity shows progress on the Lock Screen.
Extract audio to MP3 on-device — no upload, no account, works offline. Plus 290+ more file operations.
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