Convert 3GP to AMR — Free Online Converter
Convert 3GPP Multimedia (.3gp) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Giới thiệu về chuyển đổi 3GP sang AMR
Both 3GP and AMR originate from the same GSM mobile ecosystem. The 3GP container wraps video and audio streams together, while the AMR (Adaptive Multi-Rate) format is a standalone audio file containing only the voice-optimized codec operating at 8 kHz with bitrates from 4.75 to 12.2 kbps. Converting 3GP to AMR strips the video track and extracts the AMR audio stream, often as a direct copy without re-encoding, producing the smallest possible voice file.
Tại sao nên chuyển đổi 3GP sang AMR?
AMR files are still used in telephony systems, voicemail servers, IVR (Interactive Voice Response) platforms, and embedded devices where bandwidth is extremely limited. A standalone AMR file is far smaller than the 3GP wrapper — removing the video track and container overhead can cut file size by 80-95%. This conversion is also useful when feeding audio to speech recognition systems optimized for AMR input, or when sending audio via MMS on networks that enforce strict size limits.
Các trường hợp sử dụng phổ biến
- Extracting voicemail recordings from 3GP files for a telephony system that requires raw AMR input