Audio Mastering Export Formats: What Every Producer Should Know

Look, I've seen producers spend months perfecting a track, only to tank the whole thing by exporting a 128kbps MP3 for mastering. The mastering engineer is professional, doesn't say anything, but internally they're screaming.

Export settings matter more than you think. Not because of some audiophile obsession with "warmth" or "clarity" — but because you're literally throwing away information when you pick the wrong format. And once it's gone, no amount of expensive plugins will bring it back.

The Golden Rule: Export Lossless for Mastering

If your track is going to a mastering engineer, send them WAV or FLAC files. That's it. Not MP3. Not AAC. Not "high quality" M4A.

WAV is the industry standard because it's completely uncompressed. What you export is exactly what the engineer gets — no hidden compression algorithms, no psychoacoustic modeling, no data thrown away to save space.

FLAC is fine too (it's lossless compression), but some old-school engineers prefer WAV because it's universally compatible. There's no technical difference in audio quality, but WAV has zero compatibility issues. Ever.

Bit Depth: 24-bit vs 16-bit

Here's where people get confused. You've probably heard that CDs are 16-bit, so why would you need more?

Because mixing and mastering aren't the same as distribution.

When you're producing and mixing, work at 24-bit. It gives you more headroom, better signal-to-noise ratio, and more precision when applying effects. Think of it as working with extra decimal places in your calculations — more room for accurate processing.

But when you're delivering the final master for CD or streaming? That gets reduced to 16-bit. The mastering process handles this reduction (called dithering) properly, so you don't get weird artifacts.

So the answer is simple:

• For mastering: send 24-bit if that's what you recorded/mixed at
• For distribution: 16-bit is standard (your engineer will handle the conversion)
• For high-res platforms (like Qobuz or Tidal HiFi): 24-bit delivery is sometimes requested

And please, don't upsample a 16-bit recording to 24-bit thinking it'll sound better. You're just adding empty data. If you recorded at 16-bit, send 16-bit.

Sample Rate: Stop Overcomplicating This

People obsess over sample rates. "Should I record at 192kHz?" No. You really shouldn't.

Here's the honest truth: 44.1kHz is perfectly fine for most music. It covers the entire range of human hearing (up to 22kHz), and it's the standard for CD-quality audio.

48kHz is common in video production and professional studios. Some engineers prefer it. Both are totally fine.

Going higher (96kHz, 192kHz) gives you more headroom for time-stretching and pitch-shifting, but unless you're doing heavy audio manipulation, you won't hear the difference in the final product. And your file sizes will be massive.

The rule: export at the same sample rate you recorded at. If you tracked at 48kHz, export at 48kHz. Don't upsample to 96kHz for mastering — you're not gaining anything, just creating larger files.

Headroom: Leave Space for the Engineer

When you export your mix for mastering, your peaks should be around -6dB to -3dB. Not hitting 0dB. Not clipping. Not "maximized."

Mastering engineers need headroom to work. If your mix is already slammed into the limiter at 0dB, there's nowhere for them to go. They can't add punch, they can't shape dynamics — they're stuck fixing your over-compressed mix instead of enhancing it.

I know it's tempting to make your track "louder" before sending it off. Resist. The mastering engineer will get it loud. That's literally their job. Send them a clean, dynamic mix with headroom, and they'll make it sound professional.

Distribution Formats: What to Deliver

Once your track is mastered, you'll need to deliver it in multiple formats depending on where it's going. Here's the breakdown:

Streaming platforms (Spotify, Apple Music, YouTube Music) typically want 16-bit, 44.1kHz WAV files. They'll encode them into their own lossy formats (Ogg Vorbis for Spotify, AAC for Apple Music). Send them the best quality source, and they'll handle the compression.

Bandcamp and independent distribution often let you upload FLAC and WAV alongside MP3. Do it. Give your fans the lossless option. Some people care, and it costs you almost nothing to include.

Promotional use (sending to DJs, radio, blogs) is where MP3 still makes sense. 320kbps MP3 is the standard. It's small enough to email, high enough quality that it won't sound bad on most systems. Use KokoConvert's audio converter to batch-export MP3s from your WAV masters.

Some labels request multiple deliverables: WAV for the master archive, MP3 for promos, and sometimes AAC for specific platforms. Keep a checklist. Missing a format means delays and annoyed A&R reps.

MP3 Bitrates: When You Have to Compress

If you need MP3 files (and sometimes you do), here's the quick guide:

• 320kbps — highest MP3 quality, use for distribution and DJ promos
• 256kbps — still very good, slightly smaller files
• 192kbps — acceptable for casual listening, but you can hear compression artifacts on good speakers
• 128kbps — only if you're desperate for tiny file sizes (early internet nostalgia vibes)

Honestly, storage is cheap now. Just stick with 320kbps and stop worrying about it.

Metadata: Don't Forget This Part

Your audio file should include proper metadata (artist name, track title, album, year, genre). It sounds obvious, but I've received mastered files labeled "Final_Master_v3_REAL.wav" with zero ID3 tags.

Streaming platforms pull metadata from your files. If it's missing or wrong, your track gets mislabeled, mis-credited, or just looks unprofessional.

Most DAWs let you embed metadata on export. Use it. And if you need to batch-edit tags across multiple files, audio conversion tools often include metadata editors.

When Mastering Engineers Request Stems

Sometimes (especially for film, TV, or high-budget projects), the mastering engineer or mixing engineer will ask for stems instead of a single stereo mix.

Stems are grouped tracks: drums, bass, synths, vocals, etc. Each stem should be:

• Exported as 24-bit WAV
• At the same sample rate as your project
• Starting from the same timeline position (bar 1, beat 1)
• The same length (so they line up perfectly when imported)
• Clearly labeled (Drums.wav, Bass.wav, Vocals.wav — not Track_07.wav)

Stems give the engineer more control. If the vocal needs a slight EQ tweak without affecting the whole mix, they can do it. But stems also mean more work for you, so clarify upfront whether they're needed.

Common Export Mistakes

Before we wrap up, here are the mistakes I see all the time:

Clipping on export. Your DAW's master fader is hitting red. The exported file is distorted. Leave headroom.

Wrong sample rate. You recorded at 48kHz but exported at 44.1kHz without proper resampling. Now you have weird digital artifacts.

Sending MP3 for mastering. Just don't. Send lossless files.

Forgetting to bounce tails. If you have reverb or delay on the last note, make sure the export captures the full decay. Otherwise your track just... cuts off awkwardly.

Mismatched file names. If you send "Track_Final.wav" and then send a revision called "Track_Final_V2.wav," the engineer has no idea which is which. Use clear naming: ArtistName_TrackTitle_Master_2026-04-22.wav.

So What Should You Actually Do?

If you want the short version:

• Export 24-bit WAV at your project's sample rate (usually 44.1kHz or 48kHz)
• Leave -6dB to -3dB headroom on the master
• Send that file to your mastering engineer
• Once you get the master back, create distribution formats: 16-bit WAV for streaming, 320kbps MP3 for promos
• Embed proper metadata before uploading anywhere

That's it. No magic. No secret sauce. Just clean exports that give everyone down the chain the best possible source to work with.

And if you're managing multiple formats for different platforms, tools like KokoConvert's audio converter make batch conversion painless. Upload your WAV master, export to MP3, AAC, FLAC — whatever you need — without re-rendering from your DAW every time.