FLAC to AAC for Podcasts

Podcasters hit this specific conversion because CD rips is where the FLAC came from — a remote guest, a field recording, a clip — and FLAC is lossless but poorly supported outside audiophile software — Apple's Music app won't touch it. For a show you need AAC, so the FLAC-to-AAC step is part of the edit, not an afterthought.

AAC 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 AAC 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.

Storage-wise you're looking at about 4× less: 5 MB per minute becomes roughly 1.2. Single clean encode from a full-quality source — the best-case scenario for a lossy format, with no inherited artifacts.

The FLAC on your drive almost certainly started life in CD rips, and FLAC is lossless but poorly supported outside audiophile software — Apple's Music app won't touch it. AAC is the destination because it plays essentially everywhere — HLS streaming segments and every ordinary phone, browser, and player. A minute of FLAC is about 5 MB; the same minute as AAC is roughly 1.2. Across an album or a long recording that difference decides whether it fits on a phone. Because FLAC is lossless, encoding to AAC here is the clean, single-generation case — the encoder sees the whole original signal, so this AAC is as good as the format gets.