Convert 3G2 to AMR — Free Online Converter

AMR (Adaptive Multi-Rate) is the native audio codec used inside most 3G2 files, designed specifically for efficient speech encoding over cellular networks. Converting 3G2 to standalone AMR extracts this audio track and saves it as an independent .amr file, stripping away the video component entirely. This is essentially a demux operation that isolates the audio bitstream from the 3GPP2 container.

The AMR codec was ubiquitous in the feature phone era and remains supported by many embedded systems, VoIP platforms, and telecommunications tools. Standalone .amr files are compact — a minute of speech uses only about 90 KB at the standard 12.2 kbps rate — making them practical for storage-constrained applications and low-bandwidth transmission.

The main reason to extract AMR from 3G2 is to isolate the audio for use in systems that expect standalone AMR input — telephony platforms, IVR systems, SMS/MMS gateways, and embedded devices. Many telecom-grade tools process .amr files directly but cannot parse the 3G2 container. Extracting the audio eliminates the video overhead and produces the smallest possible audio file.

AMR extraction is also useful for forensic and archival purposes. When you need the raw audio bitstream exactly as it was encoded by the phone's hardware — without any transcoding — demuxing to standalone AMR preserves the original encoding bit-for-bit, including any artifacts that might be relevant for analysis or authentication.