AIFF to M4A Converter

Convert AIF to M4A Online

.aif is Apple's uncompressed AIFF audio under its three-letter, Windows-safe spelling — identical bytes to a .aiff, so this page accepts both. AIFF stores raw PCM that runs to roughly 10 MB per minute, which is fine for a master but heavy for a phone or a shared link. Converting to M4A re-encodes that PCM with AAC, Apple's own modern audio codec, to produce a much smaller file that plays natively across the Apple ecosystem.

How to Convert AIF to M4A

1. Upload Your AIF File: Drag and drop your .aif or .aiff onto the page, or click "+ Add Files" to browse. GarageBand and Logic bounces, ProTools renders, and Mac CD-rips all work, and you can queue several files in one batch.
2. Pick a Quality Preset: Open Advanced Options and choose a Quality Preset — "Very High (Recommended)" suits music, while a lower preset shrinks the file further. The output uses the AAC codec by default, which is what makes an M4A small.
3. Set a Constant Bitrate or Target Size (Optional): Prefer an exact rate? Switch to Constant Bitrate and pick a value such as 256 kbps for near-transparent music or 128 kbps for voice. Specific file size lets you cap the result instead, and Audio Sample Rate / Audio Channel stay on "Original" unless you need to resample or downmix.
4. Convert and Download: Click "Convert" and download your M4A file. No sign-up, no watermark.

AIF (AIFF) vs M4A (AAC)

Frequently Asked Questions

Will converting AIF to M4A lose audio quality?

Yes, but cleanly and usually inaudibly. AIFF holds uncompressed PCM and M4A uses AAC, a lossy codec, so the conversion discards data the way a high-quality JPEG discards image detail — at a sensible bitrate the difference is hard to hear. It is a single-generation encode, which is the normal way to make a master small for everyday use. Keep your original .aif as the master, because the discarded detail cannot be restored later by converting the M4A back. For a lossless small copy instead, use AIF to FLAC.

How small will the M4A be compared with the AIF?

Far smaller. An uncompressed AIFF runs to roughly 10 MB per minute, so a three-minute track is around 30 MB; the same track as a 256 kbps M4A lands near 6 MB, and at 128 kbps closer to 3 MB. The exact size depends on the bitrate you choose under Constant Bitrate or the Quality Preset — higher settings sound better and weigh more. In our testing, a 16-bit / 44.1 kHz stereo bounce that was about 41 MB as AIF came down to roughly 8 MB as a 256 kbps M4A with no obvious change to the music.

What bitrate should I pick for M4A?

For music, 256 kbps AAC is effectively transparent for most listeners and is the rate Apple Music uses; 192 kbps is a good balance, and 320 kbps wrings out a little more headroom. For spoken word, podcasts, or audiobooks, 96-128 kbps keeps files tiny without hurting clarity. AAC is efficient enough that an M4A generally sounds better than an MP3 at the same bitrate, so you can often step down a notch versus what you would use for MP3.

Is .aif the same as .aiff, and should I pick M4A over MP3?

Yes, .aif and .aiff are the same uncompressed PCM file — Apple specified AIFF in 1988, but 8.3-era and Windows tools needed a three-letter extension, so .aif became a common spelling. This page accepts either and the M4A is identical either way; if your file uses the four-letter extension, AIFF to M4A runs the same conversion. As for the target: M4A is the natural choice inside the Apple ecosystem and its AAC generally beats MP3 at the same bitrate, but pick AIF to MP3 when you need the most universally compatible file, or AIF to AAC for a raw .aac stream instead of the tagged .m4a container. One edge case: a .aif that is secretly an AIFF-C carrying a lossy payload was already degraded before upload, so encoding it to AAC adds a second generation of loss.

Are my uploaded files kept private?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.