Convert Audio Interchange File Format (.aiff) to MPEG-4 Part 14 (.mp4) online for free. Fast, secure audio conversion with no watermarks or registration.
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 .mp4 file when it's ready.
AIFF stores pristine uncompressed audio in Apple's legacy format, while MP4 (MPEG-4 Part 14) is the most universally supported media container in the world. Converting AIFF to MP4 compresses the audio to AAC and wraps it in a container that works everywhere — web browsers, smartphones, smart TVs, game consoles, car stereos, and every operating system. MP4 is the format the internet runs on.
AIFF is effectively limited to Apple professional environments. MP4/AAC plays on every device ever made in the last 15 years. For web distribution, social media, mobile apps, or any cross-platform scenario, MP4 is the only format that guarantees universal compatibility. The HTML5 audio and video elements support MP4 natively in all browsers.
FFmpeg encodes AIFF PCM to AAC-LC at a configurable bitrate (128-320 kbps) inside an MP4 container. The faststart flag places the moov atom at the beginning for progressive web playback. First-generation encoding from uncompressed source produces optimal AAC quality. The MP4 container supports metadata, album art, chapter markers, and streaming hints.
Encoding directly from uncompressed AIFF produces the best possible AAC quality — no generational loss from previous compression. At 256 kbps AAC, the output is perceptually transparent. At 192 kbps, transparent for virtually all listeners. At 128 kbps, slight high-frequency softening may be detectable on studio monitors.
| Device | AIFF | MP4 |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Native |
| Linux | Partial | Native |
| 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 MP4 is the conversion from studio format to universal distribution format. MP4/AAC works everywhere, and encoding from uncompressed AIFF source ensures optimal quality.
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| Native |
| Funktion | AIFF | MP4 |
|---|---|---|
| Fullstandigt namn | Audio Interchange File Format | MPEG-4 Part 14 |
| Filandelse | .aiff | .mp4 |
| Bast for | Lossless quality | Universal compatibility |