How to Convert Audio for Podcasts: Format & Quality Guide
When you convert audio for podcast distribution, the goal isn't just changing file formats — it's hitting the exact specifications that podcast platforms expect. Get the format, bitrate, sample rate, and loudness right and your show sounds consistent across Apple Podcasts, Spotify, and every other player. Get it wrong and listeners reach for the volume knob, or worse, your episode gets rejected on upload. This guide walks through the specs and the conversion workflow.
The Standard Podcast Audio Specs
Most major podcast directories converge on the same set of technical requirements. Following them avoids rejections and listener complaints.
| Parameter | Recommended Value |
|---|---|
| Format | MP3 |
| Bitrate | 128-192 kbps (CBR) |
| Sample rate | 44.1 kHz |
| Channels | Mono or stereo |
| Loudness | -16 LUFS (stereo) / -19 LUFS (mono) |
| Peak | -1 dBTP (true peak) |
MP3 is the universal podcast format. Every directory accepts it, every player decodes it, and the file sizes are manageable for mobile listeners on cellular data. Some platforms accept AAC or WAV, but MP3 is the safe default.
Mono vs Stereo for Podcasts
Most spoken-word podcasts are mono. Here's why:
- Half the file size — A mono MP3 at 128 kbps is roughly half the size of a stereo file at the same bitrate, because there's only one channel of data.
- Consistent playback — Listeners with a single earbud still hear everything. Stereo can drop content entirely for someone wearing one bud.
- Simpler editing — No phase issues when mixing multiple mic sources.
Choose stereo only when your content benefits from spatial audio — music-heavy shows, fiction podcasts with sound design, or field recordings where ambience matters. If you record in stereo but the content is speech, downmix to mono during conversion.
Podcast Loudness Standards
Loudness is measured in LUFS (loudness units relative to full scale), which accounts for how humans actually perceive volume — not just peak levels. Podcast platforms target specific loudness values and may normalize your audio if it's off.
The key targets:
- -16 LUFS stereo — Apple Podcasts, Spotify, and most major platforms.
- -19 LUFS mono — The mono equivalent, since a mono file reads 3 LU louder than the same stereo mix.
- -1 dBTP true peak — Leave headroom so encoding doesn't introduce clipping.
If you submit louder than target, platforms turn you down. If you submit quieter, they boost you — which can raise noise floor. Hitting the target directly is always best.
Bitrate and Quality
For spoken-word podcasts, 128 kbps mono is the sweet spot — clear speech, small files. Use 192 kbps for music-heavy or stereo content. Avoid going below 96 kbps; artifacts become audible in speech at lower bitrates. Always use CBR (constant bitrate) rather than VBR for podcasts, since some players handle VBR inconsistently and it can break chapter markers.
ID3 Tags and Metadata
Podcast MP3 files carry ID3 tags that players and directories read. Fill these out during or after conversion:
- Title — Episode title
- Artist — Show name
- Album — Podcast name (often same as artist)
- Track number — Episode number
- Year — Publish date
- Album art — Square image, 1400×1400 to 3000×3000 px, JPG or PNG
Missing album art is the most common reason an episode looks unfinished in a player. Most converters, including Keynou's audio converter, preserve ID3 tags during format conversion.
Step-by-Step: Convert Audio for Podcast
- Finalize your edit in WAV or FLAC (lossless source).
- Open the audio converter.
- Set output format to MP3.
- Set bitrate to 128 kbps CBR (mono) or 192 kbps CBR (stereo).
- Set sample rate to 44.1 kHz.
- Downmix to mono if your content is speech-only.
- Convert and download.
- Verify loudness with a LUFS meter (youlean, Audacity's loudness plugin) — adjust in your editor and re-export if needed.
- Embed ID3 tags and album art.
If your source is a video recording — say, a video podcast or interview — extract the audio first with video to MP3 for compressed output or video to WAV for a lossless master, then convert to podcast specs.
Related Tools
- Audio Converter — Convert to MP3 with bitrate and channel control
- Video to MP3 — Extract audio from video podcast recordings
- Video to WAV — Extract lossless audio for podcast mastering
Further Reading
- EBU R128 Loudness Recommendation — The broadcast loudness standard underlying podcast targets
- Apple Podcasts Specifications — Format and metadata requirements for Apple's directory
- Auphonic Loudness Guide — Practical explanation of LUFS for podcasters
