Convert AIFF to MP3

AIFF is the Mac's own raw audio: GarageBand bounces it, Logic exports it, and a drawer of old sessions is full of it. It is also huge and half the world's players shrug at it. This page decodes AIFF in your browser — with a parser written for this site, because two of the three browser engines never learned the format — and encodes MP3 at 320 kbps. Your files are never uploaded.

  1. Your recordings

    Drop your AIFF files here

    AIFFAIFMP3

    Your files are never uploaded.

  2. What you want back

  3. Your files

How to convert AIFF to MP3

  1. Drop your AIFF files

    .aiff and .aif both work, several at once — each converts on its own row.

  2. Check the target says MP3

    MP3 at 320 kbps is pre-selected; WAV is one press away if an editor is the destination rather than a player.

  3. Save the MP3s

    Each file downloads on its row, or all together as a zip.

What you get

A decoder two browsers do not have

Only one of the three browser engines reads AIFF natively — measured here, all three. So this page carries its own parser: AIFF is uncompressed PCM in a simple container, and reading it takes a hundred lines, not a library. Chrome and Firefox convert your files all the same.

AIFF-C from Macs included

Macs often write AIFF-C with byte-swapped samples (the "sowt" variant) — same audio, different byte order, and a common reason other tools reject a perfectly good file. Both forms decode here; genuinely compressed AIFF-C is refused honestly on its row instead of decoding as noise.

One encode, at the top of the format

AIFF is uncompressed, so MP3 at 320 kbps is the first and only loss in the chain — the best case lossy conversion gets. For speech and most music the difference from the master is not audible on normal playback.

Sessions stay on your machine

Old AIFF archives are usually someone's own recordings. They decode in this page — your files are never uploaded, whether it is one bounce or a folder of them.

Questions about AIFF and MP3

What is the difference between .aiff and .aif?
Nothing — two spellings of the same extension from the era of three-letter filename limits. Both drop here.
How much smaller does the MP3 come out?
Roughly a quarter of the AIFF at 320 kbps: uncompressed CD-shape audio runs about 10 MB a minute, MP3 at this rate about 2.4 — an hour that was 600 MB of AIFF becomes about 140 MB of MP3.
Does converting lose quality?
One generation of MP3 loss, taken once at the format's highest standard bitrate. AIFF being uncompressed means there is no stacked loss — this is the cleanest starting point MP3 conversion can have.
My AIFF is refused — why?
A few AIFF-C files use actual compression (µ-law, IMA4) rather than raw PCM; those are rare, old, and refused with a message rather than decoded wrongly. Everything GarageBand and Logic export as AIFF is plain PCM and converts.
Is it free, and are my files uploaded?
Free, no account, no cap on files. Decoding — including the AIFF parser itself — runs in your browser; your files are never uploaded.

Keeping it lossless? The WAV converters skip the re-encode. Or see all the audio tools.