FormatDrop
Audio Format Comparison

AIFF vs MP3 — Uncompressed Audio vs Compressed Standard

AIFF and MP3 represent two extremes of audio storage. AIFF stores uncompressed PCM samples — bit-perfect, large, and fast to edit. MP3 stores lossy compressed audio — much smaller, lossy, and universal. Choosing between them depends entirely on whether you're producing or distributing.

AIFFvsMP3

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

FeatureAIFFMP3
CompressionNone (uncompressed PCM)Lossy (MP3)
File size (3 min stereo)~30 MB~3–9 MB
Audio qualityBit-perfectExcellent at 256+ kbps
Editor compatibilityUniversalUniversal but slower to load
Streaming servicesNot usedMost major services
Mobile playbackNative everywhereNative 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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