Opus to MP3 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. Opus files convert to MP3 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 Opus comes out as MP3, ready to use straight away.

The Opus files people convert on an iPhone almost always originate from Discord recordings, WhatsApp and Telegram voice messages, and WebRTC captures, and Opus is the best lossy codec in use, but it lives inside apps — car stereos, older iPhones and smart speakers won't play it — which is precisely why they're stuck on the phone until you convert them to MP3.

Sizes are comparable: Opus and MP3 both sit near 0.5–1.4 MB per stereo minute, so this conversion is about compatibility, not storage. 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.

Opus to MP3 is a common iPhone snag specifically because Opus is the best lossy codec in use, but it lives inside apps — car stereos, older iPhones and smart speakers won't play it, and MP3 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 Opus 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 Opus file never leaves the handset. For iPhone that is the whole argument: Discord recordings 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 Opus-to-MP3 conversion on-device means there is no server to trust in the first place.

Most people meet Opus through Discord recordings. It is a fine format there; the trouble is that Opus is the best lossy codec in use, but it lives inside apps — car stereos, older iPhones and smart speakers won't play it. MP3 is the destination because it plays essentially everywhere — downloads and every ordinary phone, browser, and player. Disk usage barely moves — this conversion buys compatibility rather than space. Both Opus and MP3 are lossy, so this pair stacks a second encode — at a generous bitrate it stays inaudible, but if a lossless original of the Opus exists, encode the MP3 from that instead.