What audio format for a professional podcast?
Discover the ideal audio format for your podcast: MP3, AAC or WAV? Bitrate, frequency and settings recommended by platforms.
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Podcasting has become a major medium, and with it, audio quality expectations have increased. A poorly encoded podcast can drive listeners away in the first seconds, regardless of content quality.
Choosing the audio format for a podcast is a balance between sound quality, file size and compatibility. Too much compression degrades voice, too little creates heavy files that are difficult to download.
This article guides you through podcast industry standards and helps you choose optimal settings for your show, based on your content and distribution platforms.
Table of Contents
Podcast industry standards
Apple Podcasts, Spotify, Google Podcasts and other major platforms have converged on common standards, facilitating multi-platform distribution.
FORMAT: MP3 is the universal podcast standard. It's supported by 100% of players and platforms. AAC (M4A) is also accepted and offers better quality at equal bitrate, but with slightly lower compatibility.
SAMPLE RATE: 44.1 kHz is the standard. Some platforms accept 48 kHz, but 44.1 kHz guarantees maximum compatibility.
BITRATE: Between 64 kbps (mono voice) and 192 kbps (stereo content with music). The sweet spot for most podcasts is 128 kbps stereo or 96 kbps mono.
LOUDNESS: -16 LUFS is recommended for podcasts, offering good listening volume without excessive compression. Some use -14 LUFS to be consistent with music streaming.
DURATION: No technical limit, but very long files (>3h) can cause download problems. Consider splitting.
MP3 vs AAC vs WAV: the right choice
MP3: The default and safest choice. Compatible with all devices and platforms. Sufficient quality for voice at 128 kbps. Disadvantage: slight quality loss in high frequencies.
AAC (M4A): Technically superior to MP3 – better quality at equal bitrate. Perfect for Apple Podcasts and Spotify. Disadvantage: some older players don't support it.
WAV: No compression, perfect quality. Used for archiving and editing, NEVER for distribution. A 1-hour episode in WAV would be over 600 MB instead of 60 MB in MP3.
RECOMMENDATION: Use MP3 for maximum compatibility. If your audience is primarily on Apple/Spotify and you want the best quality, AAC is a valid alternative.
IDEAL WORKFLOW: Edit in WAV to preserve quality, export as MP3 128 kbps for distribution, archive the original WAV project.
What bitrate for spoken voice?
Spoken voice has very different characteristics from music. It uses a narrower frequency range (about 100 Hz to 8 kHz versus 20 Hz to 20 kHz for music) and can therefore be compressed more aggressively.
64 kbps MONO: The acceptable minimum. Telephone quality, usable for news podcasts or very long content where size matters. Not recommended for professional productions.
96 kbps MONO: Excellent quality/size ratio for solo voice. This is the choice of many professional podcasters for interview formats.
128 kbps STEREO: Industry standard. Excellent quality for voice and sufficient for jingles/transition music. Recommended as starting point.
192 kbps STEREO: For podcasts with lots of music or complex sound effects. Quality close to CD.
TIP: If your podcast is solo voice without music, 96 kbps mono reduces size by 50% compared to 128 kbps stereo, with no perceptible quality loss.
Mono or stereo for a podcast?
This question divides podcasters, but the answer really depends on your content and workflow.
MONO: A single audio track, identical in both earphones. Advantages: 50% smaller file, perfectly centered voice, no phase problems. Ideal for: solo voice, simple interviews, educational content.
STEREO: Two distinct tracks (left/right). Advantages: better spatialization, can place different speakers at different positions, more immersive music. Ideal for: narrative podcasts, musical content, productions with soundscape.
THE DEBATE SETTLED: If your podcast is mainly spoken voice without spatial effects, mono is more efficient and sounds just as good. Stereo adds nothing if both channels are identical.
COMMON TRAP: Exporting a mono recording as stereo creates "fake stereo" that doubles size without benefit. Always check if your source is really stereo.
COMPATIBILITY: Both mono and stereo are perfectly supported by all podcast platforms.
Recommended settings by podcast type
SOLO/INTERVIEW PODCAST: MP3 96-128 kbps, mono or stereo, 44.1 kHz. 1h file ≈ 45-70 MB.
NARRATIVE/FICTION PODCAST: MP3 128-192 kbps, stereo, 44.1 kHz. Sound effects and music benefit from higher bitrate.
MUSICAL PODCAST: MP3 192 kbps or AAC 128 kbps, stereo, 44.1 kHz. Music needs more bitrate to sound good.
NEWS PODCAST: MP3 64-96 kbps, mono, 44.1 kHz. Priority to production and download speed.
VIDEO PODCAST (YouTube): AAC 256 kbps in video container, stereo, 48 kHz for video sync.
PREMIUM/EXCLUSIVE PODCAST: Consider FLAC or WAV for premium member feeds, with MP3 version for public distribution.
Loudness optimization for podcast
Podcast loudness is crucial for the listening experience. An episode too quiet forces volume increase, an episode too loud assaults the ears.
RECOMMENDED TARGET: -16 LUFS for podcasts. This is the official recommendation from Apple Podcasts and most professional guides.
TRUE PEAK: Don't exceed -1 dB True Peak. This avoids distortion on platforms that re-encode.
DYNAMIC RANGE: Aim for an LRA (Loudness Range) of 8-12 dB for voice. Too much compression sounds artificial, too little makes quiet passages inaudible.
CONSISTENCY BETWEEN EPISODES: Maintain the same loudness level from episode to episode. Listeners shouldn't have to adjust volume.
TOOLS: Use a loudness plugin (Youlean free) to measure, and a compressor/limiter to adjust. Convertly Audio also displays levels on import.
Ready to try?
Try Convert audioHow to do it in 3 steps
Import your edited episode to Convertly Audio and check loudness levels.
Convert to MP3 128 kbps (or 96 kbps mono if voice only) at 44.1 kHz.
Download the optimized file and upload it to your podcast host (Buzzsprout, Anchor, etc.).
Pro Tips
- Create an export template in your DAW with your podcast settings to ensure consistency.
- Listen to your final export on basic earbuds (like EarPods) – that's how most listeners listen.
- Compare your podcast's loudness to others in your category to make sure you're within norms.
Common mistakes to avoid
- ✗Exporting as WAV for distribution (files too heavy). Solution: always convert to MP3 for distribution.
- ✗Using 320 kbps for voice (waste of bandwidth). Solution: 128 kbps is more than enough for voice.
- ✗Exporting a mono podcast as stereo (doubles size unnecessarily). Solution: check actual channel count.
- ✗Inconsistent loudness levels between episodes. Solution: normalize all episodes to -16 LUFS.
- ✗Forgetting metadata (no visible episode title). Solution: fill in ID3 tags before export.
- ✗Audio peaks exceeding 0 dB creating distortion. Solution: use a limiter at -1 dB True Peak.