MP4 to MP3 on iPhone

iOS gives you no built-in way to turn a video into an audio file, which is why the App Store is full of converter apps — most of which upload your video to a server, show ads, or want a subscription. You don't need any of them. Safari on iOS 15.4 and newer runs this converter completely, extracting the audio on the phone itself.

The steps take about a minute. If the video is in Photos, tap it, hit the share icon and choose 'Save to Files'. Then open this page in Safari, tap the dropzone, and pick the file from Files. Convert, tap download, and Safari drops the MP3 into your Files app — the Downloads folder by default. From there you can share it to Messages, Mail, WhatsApp, a podcast app, or anywhere else.

Nothing is uploaded at any point. The extraction runs inside Safari using WebAssembly, so a private recording — a lecture you filmed, a family moment, a work meeting — never leaves the handset. Converter apps that route your video through their servers cannot make that claim.

Do it on the phone when the video is small and already on the phone: a few-minute clip extracts in seconds on any recent iPhone. Because the phone is doing the work locally, a long recording (an hour-plus lecture) will be noticeably faster on a laptop if you have one nearby — that's a hardware reality, not a limitation of the tool.

The usual reason for doing this on iPhone at all: you want to listen, not watch. Turning a video into an MP3 lets it play with the screen off, join a podcast queue, sit in a playlist, and take up a fraction of the storage — a 500 MB video typically becomes an MP3 of 5-15 MB.