Best Audio Format for Podcasts
The complete guide to audio formats for podcasters. Which format, bitrate, and settings produce the best sound for your show at the smallest file size.
MP3. That's the answer for distribution. But the full picture involves recording, editing, and exporting decisions that affect your show's quality and your hosting costs.
Why MP3 for Distribution
Every podcast app supports MP3. Every RSS feed parser expects MP3. Every listener's device plays MP3. Using anything else risks excluding listeners.
Some apps support M4A/AAC. Spotify handles OGG internally. But for your RSS feed, MP3 is the standard. Don't overthink this.
Recommended Settings
For speech-only podcasts:
For podcasts with music segments:
Most podcasts should be mono. Two hosts talking don't need stereo. Mono halves your file size with no perceivable quality loss for speech.
Recording: Not MP3
Record in WAV or AIFF. Always. Never record directly to MP3.
Your recording is the source material. It needs to be uncompressed so you can edit, process, and mix without quality loss. Record at 24-bit / 44.1 kHz WAV for the best results.
Editing: Stay Lossless
Edit in WAV. Apply noise reduction, EQ, compression, and leveling in your DAW. All processing should happen on uncompressed audio.
Export your final mix as WAV. Then convert.
Exporting: WAV to MP3
After editing, convert WAV to MP3 at your chosen bitrate. This is the file you upload to your podcast host.
If your recording software exports M4A (like GarageBand), convert M4A to MP3 before uploading to your host. Some hosts accept M4A, but MP3 is safer.
File Size Matters
Podcast hosting charges by storage and bandwidth. Every megabyte costs money.
A 60-minute episode at different settings:
| Setting | File Size | |---------|-----------| | 320 kbps stereo MP3 | ~144 MB | | 128 kbps stereo MP3 | ~58 MB | | 96 kbps mono MP3 | ~43 MB | | 64 kbps mono MP3 | ~29 MB |
The difference between 320 kbps stereo and 96 kbps mono is over 100 MB per episode. Over 200 episodes, that's 20 GB of savings.
And listeners won't notice the difference. It's speech. It doesn't need high bitrate stereo.
Metadata Is Essential
MP3 files carry ID3 tags. Fill them in:
- Title (episode name)
- Artist (show name)
- Album (show name)
- Track number (episode number)
- Year
- Genre (Podcast)
- Cover art (your show art, 3000x3000 pixels)
Proper metadata makes your podcast look professional in every app.
Common Podcast Format Mistakes
Recording in MP3: Lose quality before you even start editing. Record in WAV.
Exporting at 320 kbps: Overkill for speech. You're wasting your hosting budget.
Using stereo for two-person conversations: Both voices come from the same mic or both should be center-panned. Use mono.
Not normalizing loudness: Target -16 LUFS for stereo, -19 LUFS for mono. Consistent loudness matters more than format.
The Podcast Format Workflow
1. Record in 24-bit / 44.1 kHz WAV 2. Edit in WAV 3. Master to -16 LUFS (stereo) or -19 LUFS (mono) 4. Convert WAV to MP3 at 96-128 kbps mono 5. Add ID3 metadata and cover art 6. Upload to your podcast host
That's it. Simple, efficient, and produces professional results.