Is AIFF better quality than MP3?

Yes. AIFF keeps every sample, the way a CD does, while MP3 discards detail most ears won't miss to make the file much smaller. At 320 kbps, the rate this page always uses, most people can't tell the two apart on ordinary speakers or headphones.

How much smaller does the MP3 come out?

Under a quarter of the size. CD-quality stereo AIFF runs about 10.6 MB a minute and a 320 kbps MP3 about 2.4 MB, so an hour goes from roughly 635 MB to 144 MB. A 24-bit export from Logic shrinks further, to about a seventh, because the MP3 comes out the same size whatever the source's bit depth.

On a Mac, is there a built-in way?

Two. If you still have the GarageBand or Logic project, export straight to MP3: GarageBand's Share > Export Song to Disk and Logic's bounce dialog both offer it. For files already on disk, Apple Music will convert them once you set Settings > Files > Import Settings to MP3 Encoder and choose File > Convert > Create MP3 Version, but the copies land in your music library. This page is quicker for a folder of files you don't want in there.

Files over three hours are cut at that point, so split longer recordings first. No ID3 tags or artwork are written: each MP3 keeps its filename, and titles can be added afterwards in Apple Music or a tag editor. A few old AIFF-C files use real compression (IMA4, µ-law) and won't convert. GarageBand and Logic write plain PCM AIFF, so their exports are fine.

Is it free, and are my files uploaded?

It is free and needs no account. The AIFF parser and the MP3 encoder both run in your browser, and your files are never uploaded.

Convert AIFF to MP3

AIFF is Apple's uncompressed audio format, the kind GarageBand and Logic export. The files are big. Chrome and Firefox can't decode them, and plenty of non-Apple players won't either. This page can, with its own parser for .aiff and .aif, which are the same format. Each file comes back as a 320 kbps MP3 under a quarter of the size. Your files are never uploaded.

Den här sidan finns också på svenska. Visa på svenska

Diese Seite gibt es auch auf Deutsch. Auf Deutsch ansehen

Esta página también está en español. Ver en español

Cette page existe aussi en français. Voir en français

Essa página também está em português. Ver em português

Questa pagina esiste anche in italiano. Passa all'italiano

Your recordings
Drop your AIFF files here
AIFFAIFMP3
Your files are never uploaded.
What you want back
Your files

How to convert AIFF to MP3

Drop your AIFF files

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

A folder at a time

Drop a whole folder of AIFFs. Each file converts on its own row and keeps its filename. Any file that can't be read, such as a compressed AIFF-C, is flagged on its row and the rest carry on. The finished batch downloads as one zip.

Questions about AIFF and MP3

Is AIFF better quality than MP3?: Yes. AIFF keeps every sample, the way a CD does, while MP3 discards detail most ears won't miss to make the file much smaller. At 320 kbps, the rate this page always uses, most people can't tell the two apart on ordinary speakers or headphones.
How much smaller does the MP3 come out?: Under a quarter of the size. CD-quality stereo AIFF runs about 10.6 MB a minute and a 320 kbps MP3 about 2.4 MB, so an hour goes from roughly 635 MB to 144 MB. A 24-bit export from Logic shrinks further, to about a seventh, because the MP3 comes out the same size whatever the source's bit depth.
On a Mac, is there a built-in way?: Two. If you still have the GarageBand or Logic project, export straight to MP3: GarageBand's Share > Export Song to Disk and Logic's bounce dialog both offer it. For files already on disk, Apple Music will convert them once you set Settings > Files > Import Settings to MP3 Encoder and choose File > Convert > Create MP3 Version, but the copies land in your music library. This page is quicker for a folder of files you don't want in there.
What are the limits?: Files over three hours are cut at that point, so split longer recordings first. No ID3 tags or artwork are written: each MP3 keeps its filename, and titles can be added afterwards in Apple Music or a tag editor. A few old AIFF-C files use real compression (IMA4, µ-law) and won't convert. GarageBand and Logic write plain PCM AIFF, so their exports are fine.
Is it free, and are my files uploaded?: It is free and needs no account. The AIFF parser and the MP3 encoder both run in your browser, and your files are never uploaded.

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

Your recordings

What you want back

Your files