Quick Verdict
Use AIFF when…
Use AIFF for audio production, mastering, and any workflow where you need lossless quality with zero decoding overhead. AIFF is the universal exchange format for professional audio editing.
Use MP3 when…
Use MP3 for distribution, portable listening, and any context where file size and universal compatibility matter more than perfect fidelity. MP3 is the world's most compatible audio format.
AIFF vs MP3: Feature Comparison
| Feature | AIFF | MP3 |
|---|---|---|
| Compression | None (uncompressed PCM) | Lossy (MP3) |
| File size (3 min stereo) | ~30 MB | ~3–9 MB |
| Audio quality | Bit-perfect | Excellent at 256+ kbps |
| Editor compatibility | Universal | Universal but slower to load |
| Streaming services | Not used | Most major services |
| Mobile playback | Native everywhere | Native everywhere |
When AIFF wins
- ✓Compression: None (uncompressed PCM)
- ✓File size (3 min stereo): ~30 MB
- ✓Audio quality: Bit-perfect
When MP3 wins
- ✓Compression: Lossy (MP3)
- ✓File size (3 min stereo): ~3–9 MB
- ✓Audio quality: Excellent at 256+ kbps
Frequently asked questions
Should I edit AIFF or MP3 in Audacity?
AIFF — every time. Editing MP3 introduces double compression (decode lossy → edit → re-encode lossy = compounded quality loss). Edit lossless AIFF, export final master to MP3 once for distribution.
Is AIFF better than MP3 for casual listening?
On most equipment, no audible difference at 320 kbps MP3. On audiophile headphones with critical music, AIFF preserves more detail. For 95% of listening contexts, MP3 at 256+ kbps is indistinguishable.
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More comparisons
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