Convert Waveform Audio (.wav) 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 .wav 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.
WAV delivers full-fidelity uncompressed PCM audio — CD quality at 44.1 kHz/16-bit stereo, consuming roughly 10 MB per minute. AMR (Adaptive Multi-Rate) is a speech-optimized codec developed by the European Telecommunications Standards Institute (ETSI) and adopted by 3GPP for GSM and UMTS mobile voice calls. AMR-NB operates at 8 kHz mono with bitrates from 4.75 to 12.2 kbps, while AMR-WB extends to 16 kHz with bitrates up to 23.85 kbps.
Converting WAV to AMR applies aggressive speech-tuned compression, reducing a 10 MB/minute WAV file to roughly 100-200 KB/minute. This conversion is specifically designed for voice content — AMR is not suitable for music, but excels at clear speech reproduction at extremely low bitrates.
AMR is the native voice codec for billions of mobile phones worldwide. Voicemail systems, IVR platforms, and MMS messaging infrastructure often require AMR input. If you are building a telephony application, voice recording system, or need to deliver speech audio to legacy mobile networks, AMR is the expected format.
The extreme compression ratio makes AMR ideal for mass storage of speech recordings — call center logs, field interviews, voice memos, and dictation files. A library of thousands of WAV recordings can be compressed to a fraction of the storage using AMR while maintaining perfectly intelligible speech.
FFmpeg resamples the WAV input to 8 kHz (AMR-NB) or 16 kHz (AMR-WB), downmixes stereo to mono, and encodes using the libopencore-amrnb or libopencore-amrwb encoder. The AMR codec uses algebraic code-excited linear prediction (ACELP) with eight bitrate modes that can adapt per 20ms frame. The output is written as a raw AMR file (.amr) with the '#!AMR\n' magic header, or can be wrapped in a 3GP container for broader device compatibility.
AMR-NB is narrowband (300-3400 Hz) and intended purely for speech — music will sound extremely distorted. AMR-WB extends to 50-7000 Hz and sounds significantly better for voice, often described as HD Voice quality. Neither variant is suitable for music. At the maximum AMR-NB rate of 12.2 kbps, speech is clear and fully intelligible. At lower rates (4.75-5.9 kbps), speech becomes more compressed but remains understandable.
| Device | WAV | AMR |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | Native |
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
WAV to AMR conversion is purpose-built for voice content in telephony and mobile environments. Use AMR-WB when possible for HD Voice quality, and reserve AMR-NB for legacy systems that require the narrowband codec.
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| No |
| Funktion | WAV | AMR |
|---|---|---|
| Fulde navn | Waveform Audio File Format | Adaptive Multi-Rate Audio |
| Filendelse | .wav | .amr |
| Bedst til | Lossless quality | Speech optimized |