Best Audio Format and Bitrate for a Podcast (MP3 Settings)

The best delivery format for most podcasts is MP3 at 44.1 kHz: use 96 to 128 kbps stereo for speech-only shows, or 64 kbps if you export in mono, and 128 to 192 kbps stereo when music carries the episode. Record and edit in WAV, then export the MP3 once, at the end, from that lossless master.

Free toolAudio CompressorCompress audio files by adjusting bitrate and channel count directly in your browser. Reduce file size for podcasts or music while keeping your data private.Open the tool

Why MP3 is still the default for podcasts

Podcasts reach listeners through RSS feeds, and those feeds are read by hundreds of different apps, smart speakers, car systems and older phones. MP3 is the one format that practically all of them play without trouble. That is why most podcast hosts either require MP3 or recommend it.

AAC in an M4A container is also widely accepted and sounds slightly better than MP3 at the same bitrate. The catch is compatibility: a few hosts, apps and older devices handle it less reliably. Unless your host specifically recommends AAC, MP3 is the low-risk choice. Formats such as WAV and FLAC are too large to stream efficiently, and newer codecs like Opus are not something you can rely on in podcast feeds. Always check your own host’s current upload requirements before you settle on settings.

Bitrate, mono and stereo explained

Bitrate is how much data the file uses per second of audio. More bits mean more detail and a bigger file. For speech, the gains flatten out quickly: a clean voice sounds good at far lower bitrates than a full music mix.

Mono and stereo matter just as much. A stereo file splits its bitrate across two channels. A mono file puts the whole bitrate into one. So a 64 kbps mono file gives your voice roughly the same data as a 128 kbps stereo file, at half the size. Most single-voice and interview podcasts gain nothing from stereo, because voices are usually placed in the center anyway.

Sample rate is the third setting. 44.1 kHz is the long-standing standard for distributed audio and is what most hosts expect. If you record at 48 kHz, which is common for video, that is fine for editing; just check whether your host wants 44.1 kHz on the final file and set it in your editor’s export dialog.

How to set up and export your podcast audio

1. Record in WAV. Set your recorder or recording app to WAV at 44.1 or 48 kHz. Many creators use 24-bit because it leaves more headroom for level mistakes.
2. Edit and mix from the WAV files. Do all cutting, noise reduction, equalization and music beds on the lossless tracks, never on MP3 copies.
3. Set your loudness before export. A commonly used target for stereo podcasts is around -16 LUFS integrated with peaks kept below about -1 dBTP. Check your host’s guidance, since targets can differ.
4. Export a lossless master. Save the finished episode as a WAV or FLAC file and keep it. This is your archive and the source for any future re-export.
5. Choose mono or stereo in your editor. If the show is voice only, export in mono from your editor. If music or sound design is central, stay in stereo.
6. Compress the master to MP3. Open the Audio Compressor, drop in the master, pick MP3 in the Output format list and choose a Bitrate chip: 96 or 128 kbps for speech, 192 kbps for music-heavy episodes.
7. Click Compress and check the result. The result card shows the new size next to the source size and includes a player. Listen to a busy section, such as laughter or a music transition, before you download.
8. Upload and spot-check in a podcast app. After publishing, play the episode on a phone to confirm the audio, length and loudness are what you expect.

Free toolAudio CompressorCompress audio files by adjusting bitrate and channel count directly in your browser. Reduce file size for podcasts or music while keeping your data private.Open the tool

Podcast bitrate and file size comparison

Sizes are for one hour of audio and follow directly from the bitrate, so they apply to any constant-bitrate MP3.

Setting	Channels	Size per hour	Sounds like	Good for
64 kbps	Mono	About 29 MB	Clear speech, little room for music	Solo or interview shows, listeners on mobile data
96 kbps	Stereo or mono	About 43 MB	Clean speech, acceptable light music	Talk shows with short intro music
128 kbps	Stereo	About 58 MB	Solid speech and music	The safe all-round choice for most podcasts
192 kbps	Stereo	About 86 MB	Music sounds full	Music-led, narrative or sound-design-heavy shows
256-320 kbps	Stereo	About 115-144 MB	Near-transparent	Rarely needed for podcasts; bigger downloads for listeners
WAV 16-bit, 44.1 kHz	Stereo	About 635 MB	Lossless	Editing and archiving only, not for publishing

The AREM Labs compressor offers 96, 128, 192, 256 and 320 kbps and keeps the channel layout and sample rate of the file you give it. Its lowest preset is 96 kbps, so a mono export from your editor compressed at 96 kbps already gives a voice plenty of data. If you want to go down to 64 kbps mono, export that file directly from your editor, and check your host’s minimum recommended bitrate before going that low.

Fixing files that are already in the wrong format

Guests often send recordings in whatever their phone or app produced. You can bring them into line before editing:

• A guest’s voice memo arrives as M4A: convert it with the M4A to MP3 converter if your editor struggles with it, or better, convert it to WAV with the Audio Converter so your edit stays lossless from that point on.
• Your recorder made huge WAV files and you want a quick listening copy for a co-host: the WAV to MP3 converter creates one at the bitrate you choose.
• Your finished MP3 is too big for your host’s limit: re-export from the lossless master at a lower bitrate rather than compressing the existing MP3 again.

For a broader explanation of formats, codecs and conversion routes, see the guide on how to convert audio files in your browser.

Common mistakes

• Exporting 320 kbps stereo for a talk show, which roughly triples download size compared with 128 kbps for no audible benefit on speech; use 96 to 128 kbps stereo, or mono at a lower bitrate.
• Editing from MP3 files, which stacks lossy compression every time you export and makes voices sound swirly; edit from WAV and create the MP3 only once, at the end.
• Compressing an already compressed MP3 to reach a size limit, which adds artifacts on top of artifacts; go back to the lossless master and export at the lower bitrate.
• Exporting a stereo file where one voice sits hard left and the other hard right, which sounds odd in one earbud and on mono speakers; pan voices to the center or export in mono.
• Skipping loudness normalization, which leaves listeners turning the volume up and down between your show and the next; normalize the master to your host’s recommended loudness before compressing.
• Deleting the WAV master after publishing, which means any fix later requires a lower-quality workaround; keep the lossless master archived.

Frequently asked questions

Is 128 kbps good enough for a podcast? Yes, 128 kbps MP3 is more than enough for almost any podcast. Speech-only shows can go lower, to 96 kbps stereo or around 64 kbps mono, without an obvious drop in clarity.

Should a podcast be mono or stereo? Mono is usually the better choice for voice-only podcasts because it gives the voice the full bitrate at a smaller file size. Choose stereo when music, ambient sound or deliberate spatial effects are part of the show.

What sample rate should a podcast use? Use 44.1 kHz for the final MP3 unless your host says otherwise. Recording at 48 kHz is fine, as long as you check the export setting on the finished file.

Is AAC or MP3 better for podcasts? MP3 is the safer choice because it plays on virtually every podcast app and device. AAC is slightly more efficient at the same bitrate, so it is a reasonable option when your host explicitly supports it.

Can I reduce the size of a podcast episode without re-editing it? Yes, you can re-encode the finished master at a lower bitrate in an audio compressor. For the best result, start from the WAV or FLAC master rather than the MP3 you already published.

Settle your settings once and reuse them

Choosing podcast audio settings is a one-time decision: record in WAV, edit losslessly, normalize, then export MP3 at a bitrate that matches your content. Speech-first shows sit comfortably at 96 to 128 kbps, and music-led shows at around 192 kbps. When your master is ready, run it through the Audio Compressor and compare the before-and-after size before you upload.