Convert 3GPP Multimedia (.3gpp) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
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AMR (Adaptive Multi-Rate) is the voice-optimized codec that 3GPP originally designed for GSM mobile telephony. Operating at 8 kHz with bitrates from 4.75 to 12.2 kbps, AMR produces the smallest possible voice files while maintaining speech intelligibility. Since many 3GPP files already contain AMR audio internally, this conversion often amounts to extracting the existing AMR stream into a standalone audio file.
Extracting AMR audio from a 3GPP video file produces an extremely compact voice recording. At 12.2 kbps, one minute of AMR audio occupies only about 90 KB — making it ideal for mass archival of voice recordings, MMS transmission on constrained networks, or feeding into telephony-grade processing systems.
Some IVR (Interactive Voice Response) systems, voice biometric platforms, and legacy cellular infrastructure specifically require AMR input. These systems were designed to process narrowband speech and may perform poorly with wider-bandwidth audio formats. Converting 3GPP to AMR preserves the exact audio characteristics these systems expect.
FFmpeg reads the 3GPP container and inspects the audio stream. If the source audio is already AMR, it performs a direct stream copy — extracting the AMR data without decoding or re-encoding. If the source contains AAC audio, FFmpeg decodes it and re-encodes to AMR-NB using libopencore_amrnb at the specified bitrate mode. Output is always mono at 8 kHz.
When stream-copying existing AMR audio, quality is bit-identical to the source. When transcoding from AAC to AMR, significant quality reduction occurs — AAC at 48 kHz stereo becomes 8 kHz mono narrowband. This is appropriate for speech but unacceptable for music. AMR was designed exclusively for intelligible human speech reproduction.
| Device | 3GPP | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
3GPP to AMR is a specialized conversion for voice-focused applications. When the source already contains AMR, it is a simple lossless extraction. When transcoding from AAC, the output is deliberately telephony-grade.
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Mọi trình duyệt, mọi thiết bị
| Tính năng | 3GPP | AMR |
|---|---|---|
| Tên đầy đủ | 3GPP Multimedia File | Adaptive Multi-Rate Audio |
| Phần mở rộng | .3gpp | .amr |
| Phù hợp nhất cho | Mobile standard | Speech optimized |