Convert MP4 to AIFF — Free Online Converter
Convert MPEG-4 Part 14 (.mp4) to Audio Interchange File Format (.aiff) online for free. Fast, secure video conversion with no watermarks or registrati...
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Upload your .mp4 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 .aiff file when it's ready.
About MP4 to AIFF Conversion
MP4 to AIFF conversion extracts audio from an MPEG-4 video and encodes it as an uncompressed Audio Interchange File Format file. AIFF was developed by Apple in 1988 based on the IFF standard and stores audio as raw PCM data — no compression, no quality loss. It is the Mac equivalent of WAV and remains the preferred format for professional audio on Apple platforms.
Our converter decodes the audio stream from your MP4 file and writes it as 16-bit or 24-bit PCM samples in the AIFF container. This produces studio-quality audio suitable for editing, mastering, and archival purposes.
Why Convert MP4 to AIFF?
AIFF is the format of choice when you need uncompressed audio from video footage and you work on Apple hardware. Logic Pro, GarageBand, and Pro Tools on Mac all handle AIFF natively with full metadata support. Unlike lossy formats, AIFF preserves every sample from the decoded audio stream, giving you the highest possible fidelity to work with in a DAW. Archivists choose AIFF for long-term preservation because it contains no compression algorithms that could become obsolete.
Common Use Cases
- Extract uncompressed audio from video for editing in Logic Pro or GarageBand
- Archive soundtrack audio from film or documentary projects in lossless format
- Prepare audio samples from video recordings for music production
- Deliver uncompressed audio masters to clients who work on Mac platforms
- Import video audio into Pro Tools sessions for post-production mixing
How It Works
FFmpeg decodes the MP4 audio stream (typically AAC or AC3) and re-encodes it as PCM signed 16-bit big-endian (pcm_s16be) in the AIFF container. Big-endian byte order is the AIFF standard, unlike WAV which uses little-endian. Sample rate is preserved from the source (usually 44.1 kHz or 48 kHz). Bit depth can be set to 24-bit (pcm_s24be) for higher dynamic range. The AIFF container supports metadata chunks for markers, comments, and instrument data.
Quality & Performance
The output is uncompressed PCM, so the audio is as faithful to the decoded source as possible. However, since the MP4 source likely contains lossy AAC audio, the AIFF output cannot restore detail that was discarded during the original AAC encoding. The AIFF will be a perfect representation of the decoded AAC stream. File sizes are large — roughly 10 MB per minute for stereo 16-bit 44.1 kHz audio.
Device Compatibility
| Device | MP4 | AIFF |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | Native | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use 48 kHz sample rate for video-sourced audio to match standard video audio rates
- 2Choose 16-bit depth unless you specifically need 24-bit for professional mastering
- 3AIFF-C is a compressed variant — avoid it if you need true uncompressed audio
- 4Pair with Logic Pro or GarageBand for native Apple workflow integration
- 5Consider FLAC if you need lossless audio without the massive file sizes of AIFF
Related Conversions
Converting MP4 to AIFF gives you uncompressed, edit-ready audio that integrates seamlessly with Apple production workflows. While the files are large, the absence of compression ensures maximum flexibility for post-production work.