Convert WAV to AMR — Free Online Converter

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.