Convert AIF to AMR — Free Online Converter
Convert Audio Interchange File Format (.aif) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure audio conversion with no watermarks or ...
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How to Convert
Upload your .aif 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.
About AIF to AMR Conversion
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.
Why Convert AIF to AMR?
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.
Common Use Cases
- Converting AIF voice recordings from Mac systems for mobile voicemail systems
- Preparing legacy Mac interview recordings in AIF for MMS delivery
- Creating AMR ringtones from AIF sound clips on classic Mac systems
- Delivering speech content from AIF archives to VoIP platforms requiring AMR
- Compressing AIF dictation files for storage in mobile-compatible CRM systems
How It Works
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.
Quality & Performance
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 Compatibility
| Device | AIF | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tips for Best Results
- 1Use 12.2 kbps AMR rate for the best speech quality from your AIF source
- 2Only convert speech content to AMR — music and complex audio will be severely degraded
- 3Consider AMR-WB for better quality if the target system supports wideband audio
- 4Pre-process AIF files by trimming silence and normalizing levels before AMR encoding for optimal results
- 5Keep the original AIF file — AMR conversion is extremely lossy and completely irreversible
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.