Convert 3GPP Audio (.3ga) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure audio conversion with no watermarks or registration.
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3GA and AMR are closely related formats that both carry AMR-encoded voice audio, but they differ in their container structure. A 3GA file wraps AMR audio inside the 3GPP (ISO Base Media File Format) container with full box-based metadata, while a standalone .amr file uses the simpler IETF-defined AMR file format with just a six-byte magic header (#!AMR\n) followed by raw AMR frames. Some applications, embedded systems, and feature phones from the Nokia 3310 era expect the raw AMR format rather than the 3GPP container.
Converting 3GA to AMR extracts the AMR audio bitstream from the 3GPP container and wraps it in the minimal AMR file format. This is primarily a container conversion — the audio data itself typically passes through unchanged. The resulting .amr file is recognized by a broader range of legacy voice applications, basic mobile phones from Nokia, Siemens, and Ericsson, and telephony systems that predate the 3GPP multimedia container standard.
The standalone AMR format has specific niche uses where the 3GPP container is not expected or recognized. Voice over IP (VoIP) systems, interactive voice response (IVR) platforms, and certain telephony applications read raw AMR files but may choke on the more complex 3GPP container headers with their moov and mdat boxes. Additionally, Nokia and Motorola feature phones that support AMR playback often expect the .amr extension and the simple #!AMR\n header format.
Another scenario is interoperability with voice processing tools. Open-source speech-to-text engines like CMU Sphinx, voice analysis tools, and telecoms testing equipment often work with raw AMR files as their input format. If you are processing a batch of Samsung voice recordings through a speech recognition pipeline that expects AMR input, converting from 3GA to AMR ensures your files are in the expected format. The conversion is essentially instant since it only rewrites the container without touching the audio frames.
FFmpeg reads the AMR-NB or AMR-WB audio stream from the 3GPP container and writes it into a standalone AMR file. For AMR-NB sources, the output uses the standard AMR file format with a #!AMR\n header. For AMR-WB sources, the header is #!AMR-WB\n. The audio frames are copied without re-encoding (stream copy), making this a lossless container conversion. AMR-NB operates at 8 kHz with bitrates from 4.75 to 12.2 kbps across eight modes; AMR-WB operates at 16 kHz with bitrates from 6.6 to 23.85 kbps across nine modes.
This conversion is completely lossless. The AMR audio frames from the 3GA source are extracted and written into the AMR container without any decoding or re-encoding. The output file contains bit-for-bit identical audio data to the source. The file size may be slightly smaller than the original because the simple AMR header has less overhead than the 3GPP container with its box-based metadata structure.
| Device | 3GA | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
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
Converting 3GA to AMR is a specialized container conversion useful for telephony systems, speech processing pipelines, and legacy Nokia and Motorola feature phones. The conversion is instant, lossless, and produces the smallest possible audio files since the AMR file format has minimal container overhead.
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| No |
| 기능 | 3GA | AMR |
|---|---|---|
| 전체 이름 | 3GPP Audio | Adaptive Multi-Rate Audio |
| 확장자 | .3ga | .amr |
| 최적 용도 | Mobile recording | Speech optimized |