Podcasters should record and edit in WAV, then export and publish in MP3. WAV preserves full quality through production, while MP3 at 96 to 128 kbps mono delivers spoken-word audio indistinguishable from the master at one-tenth the file size, which is why MP3 remains the publishing standard across every podcast directory.
Format confusion wastes bandwidth, storage, and occasionally entire recordings, yet the underlying logic fits in two sentences: lossless formats for anything you will still work on, lossy formats for anything you are done with. Everything below expands that rule into specific settings, the formats beyond the big two, and the mistakes that quietly degrade shows.
What Separates WAV From MP3
WAV is uncompressed audio, a direct digital capture of the waveform with nothing discarded. Files run large, roughly 10 MB per minute at CD-quality stereo, and quality is perfect by definition: what the microphone captured is what the file contains.
MP3 is lossy compression. An encoder analyzes the audio, discards components human hearing is least likely to miss, and shrinks the file by 80 to 95 percent. The discarding is permanent, and each re-encoding discards more, the generational loss that drives the entire workflow logic below.
Bitrate measures how much data MP3 keeps per second. Spoken word survives compression far better than music because voices occupy a narrower, more predictable frequency range, which is why podcast bitrates run lower than music bitrates without audible penalty.
The Workflow Rule: Lossless In, Lossy Out
Record in WAV at 44.1 kHz, 16-bit or 24-bit. Storage is cheap, and a raw recording is the one asset that can never be recaptured. Recording directly to MP3 bakes compression artifacts into the master and compounds them at export, a quality tax paid forever to save gigabytes that cost pennies.
Edit in WAV or your editor’s native lossless project format. Every plugin, every level adjustment, every noise-reduction pass operates on full data.
Export once, to MP3, as the final step. One encoding generation from a lossless master is inaudible on spoken word; three generations of MP3-to-MP3 round trips are not.
Archive the final WAV master alongside the published MP3. Future remastering, clip cutting, and platform migrations all start from the lossless file.
The Export Settings That Matter
Spoken-word podcasts, mono: 96 to 112 kbps MP3 covers voice fully, and mono is correct for single-voice and interview shows since stereo doubles file size while adding nothing to centered speech.
Spoken word with music elements, stereo: 128 kbps stereo handles theme music, transitions, and multi-voice panning cleanly. This is the most common professional setting.
Music-heavy and sound-designed shows: 192 kbps stereo, the point past which further bitrate buys nothing audible on typical listening hardware, earbuds in motion.
Sample rate stays at 44.1 kHz throughout; podcast delivery gains nothing from 48 kHz, and mismatched rates cause more problems than they solve. Loudness targets matter more than bitrate at the end: normalize to roughly -16 LUFS for stereo or -19 LUFS for mono, the de facto podcast standard, so episodes match the volume of everything around them.
A one-hour episode at 128 kbps stereo lands near 56 MB; the same hour at 96 kbps mono lands near 42 MB. Smaller files download faster, stream sooner, and consume less of your host’s bandwidth allotment.
The Other Formats, Briefly
FLAC compresses losslessly to about half of WAV size, ideal for archiving masters, irrelevant for publishing since directories do not take it. AAC and M4A beat MP3 slightly at equal bitrates and enable chapter markers, with full support across Apple and Spotify; MP3 retains the edge in universal compatibility, which is why it stays the default recommendation. M4A is also the container Apple Voice Memos and many phone recorders produce, fine as a source, converted to WAV for editing. AIFF is Apple’s WAV equivalent, interchangeable in practice. OGG and Opus, technically excellent, lack uniform directory support and stay out of podcast pipelines.
Mistakes That Quietly Degrade Shows
Recording remote sessions through platforms that deliver only compressed audio, then editing and re-exporting, stacks two lossy generations; choose tools that hand you WAV originals. Upsampling a low-bitrate file to a high bitrate at export inflates size without restoring discarded data, a surprisingly common mastering error. Publishing in stereo out of habit doubles every solo show’s file size for silence in the difference channel. Losing the WAV masters to disk cleanup converts every future need back into the compressed file’s limitations.
Frequently Asked Questions
Is WAV better than MP3 for podcasts?
WAV is better for recording and editing because it is lossless; MP3 is better for publishing because directories, apps, and bandwidth all favor its size. The formats hold different jobs, not a ranking.
What bitrate should a podcast MP3 be?
Use 96 to 112 kbps mono for pure speech and 128 kbps stereo for shows with music. Higher bitrates add file size without audible benefit for spoken word.
Can I upload WAV files to my podcast host?
Many hosts accept WAV and transcode to MP3 for delivery. Uploading your own well-encoded MP3 gives you control over the final sound; either way, keep the WAV master locally.
Does Spotify require a specific audio format?
Spotify and the other major directories serve what your RSS feed provides, with MP3 universally supported and AAC widely supported. MP3 at standard settings never raises compatibility questions.
Format strategy reduces to one habit: stay lossless until the final export, then compress once and publish. Master that pipeline and audio formats become the most settled question in your entire production.
A One-Paragraph Pipeline to Copy
Capture WAV at 44.1 kHz and 24-bit from every source, including remote platforms set to deliver lossless originals. Edit in the lossless project, normalize to -16 LUFS stereo or -19 LUFS mono, and export a single MP3 at 128 kbps stereo or 96 kbps mono depending on your music content. Upload the MP3 to your host, file the WAV master in dated storage, and repeat without deviation; boring pipelines are the ones that never ruin an episode.
