WAV vs. MP3: Which Format Should You Use for Your Stems?

When you export stems from Stemify, you choose between WAV and MP3. It seems like a small decision, but it has real implications depending on what you're planning to do with the files.

The Technical Difference

WAV is uncompressed audio. What you hear is exactly what the decoder calculated — no data has been discarded. A 4-minute song at 44.1kHz / 16-bit stereo is approximately 40MB.

MP3 is lossy compressed audio. A codec analyzes the audio and discards data that humans are statistically unlikely to notice — quiet sounds masked by louder ones, very high frequencies in certain contexts. The result is 5–10x smaller. A 4-minute song at 320kbps is roughly 10MB.

When to Use WAV for Stems

• You're processing the stem further in a DAW (EQ, compression, effects)
• You're releasing or licensing the stems professionally
• You're layering multiple stems — MP3 artifacts compound when you stack tracks
• You care about preserving the highest possible fidelity for archival

When MP3 Is Fine

• You're practicing along to an isolated instrument
• You're building a quick demo or proof of concept
• You're streaming in a set where the compression won't be audible in a club
• Storage or bandwidth is constrained

The "Generation Loss" Problem

Every time you encode audio as MP3 and decode it again, you lose quality. If you take an MP3 stem, apply effects in your DAW, and export as MP3 again, you've gone through two rounds of lossy compression. The quality degradation is audible. WAV doesn't have this problem — it's stable across any number of re-exports.

Recommendation for Most Producers

If you're serious about the output, always download WAV. Storage is cheap, and the extra 30MB per track is never going to be the constraint in a professional workflow. Save MP3 for quick previews or reference copies.