MP4 to OGG on iPhone

Safari on iOS 15.4 and newer runs the converter completely, on the phone itself. There is no App Store download — and no converter app quietly uploading your recordings to its own servers. MP4 files convert to OGG here the same way — nothing to install.

If the file is in Voice Memos or Photos, tap the share icon and choose 'Save to Files' first — that makes it visible to Safari's file picker. The converted file lands in Files (Downloads by default), from where you can share it into Messages, Mail, or any app. Your MP4 comes out as OGG, ready to use straight away.

The MP4 files people convert on an iPhone almost always originate from phone video, recorded webinars and lectures, downloaded clips, and screen captures, and the video stream is nearly the entire file, so extracting the audio collapses a 500 MB video into a few MB — which is precisely why they're stuck on the phone until you convert them to OGG.

The size drop is the point — around 50× less data, which is what turns an unsendable file into an attachment. You're stacking a second lossy generation. At a generous bitrate that's inaudible, but if you still have a lossless original, encode from that instead: one generation always beats two.

MP4 to OGG is a common iPhone snag specifically because the video stream is nearly the entire file, so extracting the audio collapses a 500 MB video into a few MB, and OGG is what your other apps and devices expect. Apple gives you no built-in way to convert audio at all, so the App Store is full of converter apps — many upload your recording to their own servers, show ads against it, and want a subscription. Doing it in Safari means the MP4 file is processed on the phone itself and stays there, which matters when it is a voice memo, an interview, or a recording of your own family.

Your MP4 file never leaves the handset. For iPhone that is the whole argument: phone video are usually personal, and the App Store alternative frequently ships them to a company's servers as the price of a free conversion. Processing the MP4-to-OGG conversion on-device means there is no server to trust in the first place.

Most people meet MP4 through phone video. It is a fine format there; the trouble is that the video stream is nearly the entire file, so extracting the audio collapses a 500 MB video into a few MB. OGG is the destination because it plays essentially everywhere — game assets and every ordinary phone, browser, and player. MP4 costs you around 60 MB for every minute; OGG asks for about 1.2. Over a long recording that gap is the whole reason to convert. Both MP4 and OGG are lossy, so this pair stacks a second encode — at a generous bitrate it stays inaudible, but if a lossless original of the MP4 exists, encode the OGG from that instead.