Opus to MP3 for Podcasts

Podcasters hit this specific conversion because Discord recordings is where the Opus came from — a remote guest, a field recording, a clip — 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. For a show you need MP3, so the Opus-to-MP3 step is part of the edit, not an afterthought.

MP3 is what you publish — Apple Podcasts, Spotify, and every RSS-based host expect it. The order matters more than the format: record and edit on a lossless file, and encode the MP3 once, from the finished episode. Converting early means every later edit sits on top of lossy audio and your export adds another generation on top of that.

Podcast bitrates are lower than most people assume, deliberately. 128 kbps stereo is the widely used standard, and 64–96 kbps mono is entirely respectable for pure speech — it roughly halves the download for every listener, which adds up across a back catalogue and matters to anyone on limited mobile data. Reserve 192 kbps and above for shows where music genuinely carries the experience.

Mono is the decision most worth revisiting. If your episode is voices with no meaningful stereo image — which describes most interview and solo shows — mono at 96 kbps is perceptually equivalent to stereo at 192 and half the size. Publishing stereo by default is a habit, not a requirement. And archive the lossless edit: social clips, best-of segments, and fixes should always be cut from that, never from the published file.

You won't save meaningful space — the two formats are within touching distance at 0.5–1.4 MB per minute. Re-encoding lossy to lossy compounds artifacts. Convert once, at a high bitrate, and keep the result rather than round-tripping again.

Where does a Opus file even come from? Usually Discord recordings, WhatsApp and Telegram voice messages, and WebRTC captures. The catch 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. 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. 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.