Convert an AMR voice recording (phone voice recorder, old voicemail) to MP3 locally in your browser. No upload.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
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No re-upload neededThese tools accept .MP3 - your file is handed over directly.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
AMR (Adaptive Multi-Rate) is the voice codec behind the classic GSM mobile network - designed solely for speech at extremely low bitrate, not for music. Older voice-recorder apps, the voice-memo features of some Android phones, and old voicemail exports produce exactly this format.
The tool natively decodes the AMR narrowband/wideband stream with ffmpeg and encodes the result with libmp3lame to MP3 - a format every player, phone and cloud storage opens, while AMR is barely supported outside telephony apps.
Since AMR is designed for speech at very low bitrate (often under 12 kbps), a low MP3 bitrate in mono is entirely sufficient - a high bitrate only produces a larger file with no additional gain in sound. The conversion runs entirely locally in the browser.
| Input formats | AMR |
|---|---|
| Output format | MP3 |
| Batch processing | No |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: AMR is a pure speech codec - unsuitable for music and already strongly limited in source quality. A high MP3 bitrate brings no additional gain in sound over the lower-quality source. One file per run.
No, the conversion runs entirely locally in the browser.
Usually from phone voice-recorder apps, voicemail exports or old Android voice memos.
No, it is designed exclusively for speech at very low bitrate - music sounds heavily compressed and thin in it.
No - the AMR source is already strongly limited, a higher MP3 bitrate only enlarges the file.
WMA to MP3 · CAF to MP3 · AIFF to MP3 · MKV to MP3 · Text to speech