AIFF vs MP3: Quality, File Size, and When to Use Each
Published on March 25, 2026
AIFF stores audio uncompressed at full CD quality, producing files around 10 MB per minute. MP3 uses lossy compression to shrink that same audio down to about 1 MB per minute at standard bitrates. Choose AIFF when you need perfect audio fidelity for editing or mastering. Choose MP3 when file size and compatibility matter more than preserving every frequency.
Sound Quality
AIFF (Audio Interchange File Format) stores raw PCM audio data with zero compression, preserving the exact waveform from the original recording. MP3 discards audio information that psychoacoustic models predict most listeners will not notice. At 320 kbps, MP3 sounds nearly identical to AIFF on consumer headphones and speakers. At 128 kbps, the difference becomes audible on cymbals, reverb tails, and complex musical passages. On studio monitors, trained ears can pick up MP3 artifacts even at higher bitrates.
File Size
A 3-minute song in AIFF takes about 30 MB (16-bit, 44.1 kHz). The same song as MP3 at 320 kbps is about 7 MB, and at 128 kbps about 3 MB. That is a 4-10x size difference. For large music libraries, this adds up fast. A 1,000-song collection in AIFF needs roughly 30 GB versus 3-7 GB in MP3.
Compatibility
MP3 plays on everything: phones, car stereos, Bluetooth speakers, web browsers, and every media player ever made. AIFF plays natively on Apple devices and most desktop audio software, but support on Android, Windows media players, and web platforms is inconsistent. For sharing audio with others, MP3 is the safer bet. WAV has better cross-platform support if you need an uncompressed format that works everywhere.
Editing and Production
Audio professionals prefer AIFF (or WAV) for editing because uncompressed audio does not degrade when you apply effects, normalize levels, or re-export. Every time you decode and re-encode MP3, you lose a small amount of quality. For recording sessions, mixing, and mastering, always work in AIFF or WAV. Convert to MP3 only as the final distribution step.
Which Format Should You Pick?
Use AIFF for music production, archival storage, and any workflow where you will edit the audio further. Use MP3 for sharing music, podcasts, streaming, and any situation where storage space or bandwidth is limited. If you want lossless compression (smaller than AIFF but no quality loss), consider FLAC or ALAC instead.
Need to convert between formats? Our WAV to MP3 converter handles uncompressed audio conversion, and our audio compressor can reduce file sizes with your choice of bitrate. For more audio comparisons, check MP3 vs WAV and OGG vs MP3.