Convert AIFF to AMR — Free Online Converter
Convert Audio Interchange File Format (.aiff) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure audio conversion with no watermarks or...
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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.
About AIFF to AMR Conversion
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.
Why Convert AIFF to AMR?
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.
Common Use Cases
- Encoding professional voice-over recordings for telephone IVR systems
- Preparing studio-quality announcements for voicemail greeting systems
- Creating ultra-compact audio for SMS/MMS applications
- Converting AIFF narration for embedding in cellular network infrastructure
- Building audio content for embedded systems with AMR-only decoders
How It Works
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.
Quality & Performance
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 Compatibility
| Device | AIFF | 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
- 1Apply a bandpass filter (300-3400 Hz for NB, 50-7000 Hz for WB) to the AIFF before conversion to preview what the output will sound like
- 2Use AMR-WB at 23.85 kbps for the best possible speech quality within the AMR family
- 3Normalize the AIFF audio to -3 dBFS before conversion — AMR handles consistent input levels better than dynamic content
- 4Record voice prompts in mono from the start if you know the destination is AMR — this gives you more control over the downmix
Related Conversions
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.