Convert Adaptive Multi-Rate Audio (.amr) to 3GPP Multimedia (.3gp) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .amr file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .3gp file when it's ready.
AMR (Adaptive Multi-Rate) is the default voice codec used by GSM mobile networks worldwide, encoding speech at bit rates between 4.75 and 12.2 kbps. Converting AMR recordings to 3GP wraps the audio inside a 3GPP multimedia container that older feature phones and Android devices handle natively. Because 3GP is essentially a lightweight MPEG-4 profile designed for cellular networks, the resulting file keeps the tiny footprint AMR is known for while gaining broader playback support on mobile handsets.
Standalone .amr files are difficult to share — most messaging apps and email clients refuse to attach or preview them. Packaging the same AMR audio stream inside a 3GP container makes the file recognizable to media players on virtually every phone sold in the last two decades. 3GP also allows you to add metadata such as a title or timestamp, which raw AMR files cannot carry. If you plan to embed the recording in an MMS message, 3GP is the expected container on many carriers.
The conversion remuxes the AMR-NB stream into a 3GP container (MPEG-4 Part 12 profile) without re-encoding, so there is zero quality loss and the process is nearly instantaneous. FFmpeg copies the AMR audio track directly using stream mapping. The 3GP container adds a few hundred bytes of header overhead but does not alter the underlying codec data.
Because the audio stream is copied rather than re-encoded, the output quality is bit-for-bit identical to the source AMR file. Expect narrow-band speech clarity suitable for voice memos and phone calls — not music.
| Device | AMR | 3GP |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| 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
Wrapping AMR audio in a 3GP container is the simplest way to make voice recordings playable on mobile devices that do not recognize bare .amr files. The conversion is lossless and instant.
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| No |
| Funktion | AMR | 3GP |
|---|---|---|
| Fullstandigt namn | Adaptive Multi-Rate Audio | 3GPP Multimedia |
| Filandelse | .amr | .3gp |
| Bast for | Speech optimized | Mobile optimized |