Add your AIFF file
Drop one or more .aiff files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
AIFF to M4A
Re-encoding .aiff audio as .m4a changes how the sound is compressed and which players will accept it. Free, private, and validated — the file never leaves your browser.
100% private for supported formats
Runs on your deviceConvert supported files
Drop AIFF files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting Audio Interchange File to MPEG-4 audio
Re-encoding .aiff audio as .m4a changes how the sound is compressed and which players will accept it. An .aiff file is Apple's Audio Interchange File Format, storing uncompressed PCM audio much as WAV does on Windows. Mac-based studios have exchanged .aiff masters for decades, and Logic Pro sessions and sample libraries remain full of them.
An .m4a file is an MPEG-4 container that holds only audio, most often AAC and occasionally Apple Lossless. Apple coined the .m4a extension so audio would not be confused with .mp4 video, and it remains the default for iTunes purchases, Apple Music downloads, and Voice Memos. For this route the practical draw is real tagging and artwork support, unlike bare .aac streams and gapless playback metadata for continuous albums — balanced against the extension hides whether the contents are lossy or lossless, muddying quality expectations, which is worth knowing before you commit a large batch.
Why convert AIFF to M4A?
The practical trigger for this conversion is usually a mismatch: with .aiff, as bulky as any uncompressed format. Switching to .m4a buys you real tagging and artwork support, unlike bare .aac streams, which is why it is the better fit for managing music inside iTunes and Apple Music libraries. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
AIFF vs M4A at a glance
| Aspect | Audio Interchange File (.aiff) | MPEG-4 audio (.m4a) |
|---|---|---|
| Format type | Lossless — every pixel or sample is preserved exactly | Lossy — discards detail it judges invisible to shrink files |
| How it stores data | classic AIFF stores big-endian PCM, the opposite byte order from WAV, in COMM and SSND chunks | an ISO base media container restricted to audio tracks, structurally a sibling of MP4 |
| Strongest at | delivering masters from macOS-based studios | managing music inside iTunes and Apple Music libraries |
| Weak spot | as bulky as any uncompressed format | the extension hides whether the contents are lossy or lossless, muddying quality expectations |
| Metadata | nAME, AUTH, and ANNO chunks provide basic text, marker and instrument chunks store loop data, and an ID3 chunk is a common unofficial extension used by iTunes | iTunes-style metadata atoms: title, album, artwork, composer, BPM, and the iTunSMPB gapless-playback data |
Pick M4A as the output
Select .m4a in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if M4A is selectable, the route is real and validated.
Convert on your device
Press Convert. The transcode runs on an FFmpeg engine compiled to WebAssembly, so the audio never leaves your device.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid M4A file. Outputs keep the original filename with the .m4a extension.
AIFF to M4A questions, answered
Will converting AIFF to M4A lose quality?
Some. Since aiff is lossless-oriented and m4a is lossy-oriented, the encoder will discard detail it judges least visible; the quality slider controls how aggressive that is. Keep the original .aiff if you may need a pristine master later.
Is it private to convert AIFF files here?
Yes — the .aiff file is processed inside your browser tab and never uploaded. The transcode runs on an FFmpeg engine compiled to WebAssembly, so the audio never leaves your device. Close the tab and the file is gone from memory.
Where will the M4A file work?
Browsers, Windows, Android, and every Apple device play AAC-based .m4a files without extra software. The ALAC-filled variety is slightly narrower, since some inexpensive devices decode only the AAC form.
Will the M4A file be bigger or smaller than my AIFF?
Smaller, usually dramatically so — that is the main reason this route exists. The quality slider trades size against fidelity; the default sits at the point where most people cannot spot the difference.
What happens to the metadata in my AIFF file?
This converter strips container metadata deliberately (the FFmpeg command runs with metadata mapping disabled) so exported files do not leak recording details. In the source, nAME, AUTH, and ANNO chunks provide basic text, marker and instrument chunks store loop data, and an ID3 chunk is a common unofficial extension used by iTunes; none of it is transmitted anywhere because the file never leaves your browser.