M4A to AIFF Converter

MPEG-4 Audio (M4A) is a mixed audio format used for apple devices, mobile voice and efficient compressed audio. Files saved as M4A usually come from MPEG / Apple ecosystem. Before converting, check that the source is the highest-quality copy you have, because every later step can only preserve what is already there.

The target is Audio Interchange File Format (AIFF), a uncompressed audio format chosen for apple production workflows. The target stores samples without perceptual loss, so the file grows considerably; it preserves the current quality but cannot recover earlier compression. The output keeps the original dimensions or sample rate unless you change them, so this step changes the encoding rather than the content.

AIFF writes big-endian PCM, the Apple studio equivalent of WAV. Files are large, yet Pro Tools and Logic import them without conversion. Channel layout is preserved, so a stereo source stays stereo and a mono recording is not upmixed. The sample rate is preserved unless you change it; resampling would add another processing step and is best avoided. Expect a larger output file: the format trades size for uncompressed fidelity.

This conversion runs locally in your browser tab through Canvas or FFmpeg.wasm. The file is read from your device, decoded, re-encoded and handed back as a download; it is not uploaded to a conversion server. That keeps private recordings, client material and unreleased artwork off shared infrastructure.

After the download, play or open the result before deleting the original. Check the first and last seconds, confirm that transparency, rotation metadata or sample rate survived, and compare file sizes. If something looks wrong, retry with a higher quality setting rather than converting the output again.