AIFF to M4A Converter

AIFF vs M4A — Which Should You Convert To?

AIFF is Apple's uncompressed studio format, so a single song can run tens of megabytes; M4A wraps AAC audio in an MP4 container and shrinks that down to a fraction of the size while staying transparent to most listeners. If you need a small, iTunes-and-iPhone-friendly file to share or sync, convert to M4A. If the AIFF is your only master copy, keep it: AAC is lossy, and the detail it discards never comes back.

Side-by-side Comparison

AIFF stores about 10 MB per minute of CD-quality (44.1 kHz, 16-bit) stereo audio because nothing is compressed. M4A on this page re-encodes that PCM to AAC, which is why the output is dramatically smaller. Note that the M4A extension can also carry ALAC (Apple Lossless); this converter outputs AAC, so treat it as a lossless-to-lossy step. If you want a smaller file with no quality loss at all, convert to a lossless format like FLAC instead.

When to Pick AIFF

• You are still recording, editing, or mastering and need every bit of the original.
• It is your archival master and you have no other copy.
• A DAW such as Logic Pro or Pro Tools expects an uncompressed import.
• You plan further conversions later — always re-encode from the lossless source, not from an AAC copy.

When to Pick M4A

• You want a small file to email, message, or upload that still sounds clean.
• You are syncing music or voice memos to an iPhone, iPad, or iTunes library.
• You need better quality than MP3 at the same bitrate for podcasts or audiobooks.
• Storage or upload time matters more than holding onto the last few percent of fidelity.

How to Convert AIFF to M4A

1. Upload Your AIFF File: Drag and drop your .aiff or .aif file onto the page, or click "Add Files" to browse. You can queue several at once.
2. Pick a Quality Preset or Bitrate: Leave the Quality Preset on its default for a clean result, or open Advanced Options and set a Constant Bitrate (for example 256 kbps) or Variable Bitrate for a target between size and fidelity.
3. Trim or Set Sample Rate (Optional): Use Trim to keep only part of the audio, or change Audio Sample Rate and Audio Channel if you need to downsample or fold to mono.
4. Convert and Download: Click Convert and save your M4A. No sign-up, no watermark.

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — never shared or made public.

Frequently Asked Questions

Will I lose quality converting AIFF to M4A?

Some, by design. AIFF is uncompressed PCM and this converter outputs AAC, which is lossy — it permanently discards audio detail to shrink the file. At higher bitrates (256 kbps and up) the result is transparent to most listeners on most playback gear, but the discarded data cannot be recovered. Keep the original AIFF if it is your only master.

Does this converter output ALAC (Apple Lossless) M4A?

No. An .m4a file can technically hold either AAC (lossy) or ALAC (Apple Lossless), but this tool encodes AAC. If you want lossless audio at a smaller size than AIFF with no quality loss, convert to FLAC, an open lossless format, instead of M4A.

Is M4A better than MP3 for this conversion?

At the same bitrate, AAC inside an M4A generally preserves a little more detail than MP3, especially at lower bitrates, and it is the native format for the Apple ecosystem. If you specifically need the broadest device and player compatibility, MP3 is still the safest universal choice; for Apple devices and iTunes, M4A is the better fit.

What bitrate should I choose for AIFF to M4A?

For music, 256 kbps AAC is a common sweet spot that most listeners cannot distinguish from the source. For spoken-word content like podcasts or audiobooks, 96-128 kbps keeps files small with no meaningful loss. In our testing, a 4-minute 44.1 kHz stereo AIFF re-encoded to 256 kbps AAC produced an M4A roughly a tenth the size of the original.

Why is my AIFF file so much larger than the M4A?

Because AIFF is uncompressed: it stores the full PCM waveform at about 10 MB per minute for CD-quality stereo. M4A applies AAC compression, which removes data the ear is unlikely to notice, so the same audio fits into a few megabytes. The size drop is the whole point of the conversion.

Can I convert AIF files, not just AIFF?

Yes. AIF and AIFF are the same format — AIF is just the three-letter extension used on systems that prefer short names. Upload either and the converter treats them identically.

Will the M4A keep my track titles and metadata?

Basic tags carried in the source can transfer into the M4A's metadata, since MP4 supports title, artist, and album fields. AIFF masters often have little or no embedded tag data, though, so you may need to add titles in your music library after converting.