Convert Core Audio Format (.caf) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .caf 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 .amr file when it's ready.
CAF is Apple's professional audio container with unlimited codec and file size support. AMR (Adaptive Multi-Rate) is ETSI's speech-optimized codec for mobile telephony. AMR-NB operates at 8 kHz mono (4.75-12.2 kbps), while AMR-WB reaches 16 kHz (up to 23.85 kbps).
Converting CAF to AMR takes professional macOS recordings and compresses them for telephony delivery. If the CAF contains PCM or ALAC, the AMR output benefits from lossless source quality.
CAF files cannot be processed by telephony infrastructure. Voicemail systems, IVR platforms, and MMS gateways require AMR or 3GP. Converting CAF to AMR enables macOS-recorded content to enter the mobile telephony pipeline.
This conversion is specifically useful for voice content recorded in professional macOS environments (Logic Pro, GarageBand) that must be deployed in telephony applications.
FFmpeg reads the CAF container, decodes the enclosed audio to PCM, resamples to 8 kHz (AMR-NB) or 16 kHz (AMR-WB), downmixes to mono, and encodes using libopencore-amrnb or libopencore-amrwb. From lossless CAF sources (PCM/ALAC), the AMR output achieves optimal quality with a single lossy step.
AMR-NB is narrowband (300-3400 Hz) — speech only. AMR-WB extends to 50-7000 Hz for HD Voice. Neither supports music. From lossless CAF sources, the AMR quality is optimal since only one lossy step occurs.
| Device | CAF | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| 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
CAF to AMR bridges macOS professional audio with mobile telephony. Use AMR-WB for HD Voice quality from your professional recordings.
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Mindenhol mukodik
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| No |
| Jellemzo | CAF | AMR |
|---|---|---|
| Teljes nev | Core Audio Format | Adaptive Multi-Rate Audio |
| Kiterjesztes | .caf | .amr |
| Leginkabb ajanlott | Apple native | Speech optimized |