Convert Audio Interchange File Format (.aiff) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure audio conversion with no watermarks or registration.
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Click Convert and download your .amr file when it's ready.
AIFF stores studio-quality uncompressed PCM audio, while AMR (Adaptive Multi-Rate) is a narrowband speech codec running at 4.75-12.2 kbps. This conversion represents one of the most extreme compression ratios in audio: from 1,411 kbps (CD-quality AIFF) down to 12.2 kbps AMR-NB, a 115:1 ratio. The output is designed exclusively for telephony — voicemail, IVR systems, and cellular voice transmission.
Telecom infrastructure worldwide runs on AMR. When studio-recorded voice prompts (IVR menus, hold music announcements, automated greetings) need to be loaded into a telephone switch, PBX, or voicemail platform, they must be in AMR format. The extreme compression makes AMR ideal for transmission over 2G/3G cellular links where bandwidth is measured in kilobits.
FFmpeg decodes AIFF PCM, resamples from 44.1/48 kHz stereo to 8 kHz mono (AMR-NB) or 16 kHz mono (AMR-WB), and encodes with libopencore-amrnb/libopencore-amrwb. AMR-NB uses ACELP (Algebraic Code-Excited Linear Prediction) optimized for speech. The codec adapts its bitrate (4.75-12.2 kbps for NB, 6.6-23.85 kbps for WB) based on speech characteristics and channel conditions.
AMR-NB captures only 300-3400 Hz — telephone quality. All musical content, high-frequency detail, and stereo imaging are lost. Speech remains clear and intelligible, which is the codec's sole purpose. AMR-WB extends to 50-7000 Hz, producing noticeably more natural-sounding voice. Never use AMR for music.
| Device | AIFF | 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
AIFF to AMR is the path from studio to telephone. The quality reduction is severe but purposeful — AMR delivers intelligible speech at file sizes suitable for cellular transmission.
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| No |
| Funktion | AIFF | AMR |
|---|---|---|
| Fullstandigt namn | Audio Interchange File Format | Adaptive Multi-Rate Audio |
| Filandelse | .aiff | .amr |
| Bast for | Lossless quality | Speech optimized |