Convert Audio Interchange File Format (.aiff) to Adaptive Multi-Rate Audio (.amr) 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 .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.
Truyền tải an toàn
Tải lên được mã hóa HTTPS
Quyền riêng tư là ưu tiên
Tệp tự động xóa sau khi xử lý
Không cần đăng ký
Bắt đầu chuyển đổi ngay lập tức
Hoạt động mọi nơi
Mọi trình duyệt, mọi thiết bị
| No |
| Tính năng | AIFF | AMR |
|---|---|---|
| Tên đầy đủ | Audio Interchange File Format | Adaptive Multi-Rate Audio |
| Phần mở rộng | .aiff | .amr |
| Phù hợp nhất cho | Lossless quality | Speech optimized |