Convert Audio Interchange File Format (.aif) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure audio conversion with no watermarks or registration.
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AIF is Apple's uncompressed audio format from 1988, storing big-endian PCM data in an IFF-derived container at full CD quality (16-bit, 44.1 kHz) or higher. Developed for professional and archival use on classic Mac OS, AIF preserves every audio sample without any compression or quality loss. AMR (Adaptive Multi-Rate) is a narrowband speech codec standardized by 3GPP, designed for GSM and 3G mobile networks.
Converting AIF to AMR transcodes high-fidelity uncompressed audio into a highly compressed speech-optimized format. AMR operates at 8 kHz sampling rate with bitrates between 4.75 and 12.2 kbps, making it roughly 100-200 times smaller than the AIF source. This extreme compression is designed exclusively for speech and is not suitable for music.
AMR is the standard codec for mobile voice recordings, voicemail systems, and GSM voice messaging. If you have AIF recordings of speech, interviews, or voice memos from Mac systems, converting to AMR makes them compatible with mobile telephony infrastructure and messaging systems that expect AMR-encoded audio.
The extreme compression ratio (a 10 MB AIF minute becomes ~60 KB in AMR) makes this conversion essential for bandwidth-constrained delivery like MMS, VoIP systems, and legacy mobile platforms. Starting from AIF's uncompressed PCM ensures the AMR encoder has the cleanest possible source, producing the best achievable speech quality within AMR's narrow bandwidth.
FFmpeg decodes the AIF big-endian PCM stream, downsamples from the original sample rate (typically 44.1 kHz or 48 kHz) to 8 kHz mono, and encodes using the libopencore_amrnb codec. The AMR encoder uses ACELP (Algebraic Code Excited Linear Prediction) optimized for human speech frequencies (300-3400 Hz). All audio content outside this frequency range — including stereo information, high frequencies, and sub-bass — is discarded entirely. The bitrate adapts between 4.75 and 12.2 kbps based on signal characteristics.
AMR is designed for speech only. Music, ambient recordings, and complex audio will sound severely degraded — narrowband (300-3400 Hz) at 8 kHz sampling produces telephone-grade quality. Speech remains intelligible and clear at 12.2 kbps. At 4.75 kbps, even speech becomes noticeably compressed. The lossless AIF source ensures the best possible AMR output, but the codec itself is inherently low-fidelity.
| Device | AIF | 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
AIF to AMR converts Apple's uncompressed format to a speech-only mobile codec. Use it exclusively for voice content where telephony compatibility or extreme compression is required.
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| No |
| Tính năng | AIF | AMR |
|---|---|---|
| Tên đầy đủ | Audio Interchange File Format | Adaptive Multi-Rate Audio |
| Phần mở rộng | .aif | .amr |
| Phù hợp nhất cho | Lossless quality | Speech optimized |