M4A to AIFF Converter

Convert M4A to AIF Online

Turn an M4A (AAC) audio file into an AIF — Apple's uncompressed PCM audio format — when a DAW, sampler, or editor refuses to import the compressed original. The output is standard 16-bit big-endian PCM, the same payload Logic Pro and Pro Tools expect from an .aif drop. One honest caveat up front: M4A is lossy, so converting to uncompressed AIF cannot restore detail AAC already discarded — the file just gets much larger (roughly 10 MB per minute) and sounds identical to the source.

Note that .aif and .aiff are the same format — the three- and four-letter spellings are interchangeable. This page outputs .aif; if you specifically need the .aiff extension, use M4A to AIFF instead.

How to Convert M4A to AIF

1. Upload Your M4A File: Drag and drop your file onto the page or click "+ Add Files" to pick one from your device. You can queue several M4A files and convert them with the same settings.
2. Confirm the Audio Codec: AIF output defaults to PCM 16-bit Big Endian under "Show All Options" — the standard uncompressed AIFF payload. Leave it as-is for maximum DAW compatibility, or pick another PCM variant if your tool needs it.
3. Adjust Audio Channel or Sample Rate (Optional): Both default to "Original." Force mono or resample only if your target session requires it; otherwise keep the source values to avoid an extra resampling pass.
4. Convert and Download: Click "Convert" and download the AIF. No sign-up, no watermark.

M4A vs AIF at a Glance

Frequently Asked Questions

Will converting M4A to AIF improve the audio quality?

No. M4A uses lossy AAC compression that permanently removes audio data during encoding, and no conversion can rebuild it. Moving to uncompressed AIF gives you a larger, editable PCM file that sounds the same as the M4A — never better. The benefit is compatibility and a lossless container for further editing, not restored fidelity.

Why would I convert M4A to AIF instead of just using the M4A?

Some music software won't import M4A cleanly. Logic Pro can flag imported AAC files as locked until they're converted, and Pro Tools sessions are built around uncompressed AIFF and WAV. Hardware samplers and older Apple-ecosystem editing workflows often accept only AIFF. Converting to AIF gives those tools a format they can edit, trim, and process directly.

How much bigger will the AIF file be?

Substantially. Uncompressed 16-bit, 44.1 kHz AIF runs about 10 MB per minute of stereo audio, so a 4-minute track lands near 40 MB. The same track as a 128 kbps M4A is closer to 4 MB. In our testing, a 3-minute M4A at 256 kbps (about 6 MB) converted to a roughly 30 MB AIF at the default 16-bit setting. Keep the original M4A if you still need a small file for sharing or playback.

Is .aif the same as .aiff?

Yes. AIFF (Audio Interchange File Format) has used both the .aif and .aiff extensions since Apple introduced it in 1988, and players and DAWs treat them identically. This page writes .aif; if a tool insists on the four-letter .aiff, use M4A to AIFF, or for the compressed AIFF-C container use M4A to AIFC.

Should I convert to AIF or WAV?

Both are uncompressed PCM and sound identical; the difference is byte order and ecosystem. AIF is big-endian and the traditional choice in Apple/Logic workflows, while WAV is little-endian and the cross-platform default on Windows and most non-Apple tools. If your editor is happiest with WAV, use M4A to WAV instead — the audio result is the same.

How are my files handled after conversion?

Your M4A is uploaded over an encrypted connection, converted on our servers, and the files are deleted automatically a few hours after conversion. There's no sign-up, no watermark, and your audio is never shared or made public. For batch jobs across many formats, the Audio Converter runs the same pipeline.