Convert Audio Interchange File Format (.aiff) to MPEG-4 Audio (.m4a) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .aiff file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .m4a file when it's ready.
AIFF and M4A are both Apple formats, but AIFF stores raw uncompressed PCM while M4A wraps compressed AAC or lossless ALAC in an MPEG-4 container. Converting AIFF to M4A with AAC encoding reduces file size by roughly 80% while maintaining quality that Apple considers their standard for music distribution. The M4A container supports rich metadata, chapter markers, and embedded artwork — features that AIFF handles inconsistently.
M4A is iTunes' and Apple Music's native format. Converting AIFF to M4A integrates your audio seamlessly into the Apple library ecosystem with full metadata support, Smart Playlist compatibility, and iCloud Music Library syncing. M4A files also stream efficiently and support instant seeking through proper atom placement.
FFmpeg encodes AIFF PCM to either AAC-LC (lossy, 128-256 kbps) or ALAC (lossless, ~50% of AIFF size) within an M4A container. The M4A container inherits from ISO base media file format (ISO 14496-12) and supports proper atom structure for iTunes metadata (moov/udta/meta), chapter markers (chpl), and embedded artwork. Faststart mode places the moov atom first for streaming.
With AAC encoding at 256 kbps: perceptually transparent, indistinguishable from AIFF. With ALAC encoding: bit-for-bit identical to AIFF, mathematically lossless. Choose based on your priority: maximum compression (AAC) or zero compromise (ALAC).
| Device | AIFF | M4A |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
AIFF to M4A is the canonical Apple ecosystem conversion. Whether you choose AAC for compression or ALAC for lossless, the M4A container integrates perfectly with every Apple product and service.
Sikker overførsel
HTTPS-krypterede uploads
Privatlivsfokuseret
Filer slettes automatisk efter behandling
Ingen registrering
Begynd at konvertere med det samme
Virker overalt
Enhver browser, enhver enhed
| No |
| Funktion | AIFF | M4A |
|---|---|---|
| Fulde navn | Audio Interchange File Format | MPEG-4 Audio |
| Filendelse | .aiff | .m4a |
| Bedst til | Lossless quality | Better than MP3 |