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Turn an .amr call or voice recording into an MP3 you can play on any computer or phone. The conversion happens in your browser, so the recording stays private.
Your media is processed in your browser and is not uploaded to our servers for conversion. Page assets (including the converter engine) still load over the network.
Select or drop a video or audio file
MP4, MOV, WebM, MKV, M4A, WAV, FLAC, OGG and more. Converted on your device.
Click, tap, or drop a fileFind the AMR file
Call recordings and voice-recorder files are usually in a Recordings or Call folder in your phone's Files app.
Choose the file
Drop or select the .amr file. MP3 at 64 kbps is preselected, which suits phone-quality speech.
Convert
The recording is decoded and saved as MP3 on your device.
Download
Play the MP3 to check it, then download it.
AMR (Adaptive Multi-Rate) is the speech codec used by mobile phone networks. Older Android phones, many call-recorder apps, Nokia and feature phones, and MMS voice messages save recordings as .amr. The format is tiny but most computers and media players can't open it.
AMR is phone-quality audio: AMR-NB covers speech up to about 4 kHz and AMR-WB up to about 8 kHz. The MP3 sounds exactly as clear as the original; it can't add clarity that wasn't recorded.
FFmpeg in WebAssembly decodes the AMR-NB or AMR-WB audio and encodes it as MP3. Because AMR is so compact, the MP3 will be larger than the original even at 64 kbps; that is normal.
A higher bitrate makes the file bigger without making phone-quality audio sound better, so 64 kbps (Small) is the sensible default.
Narrowband (AMR-NB) and wideband (AMR-WB, .awb-style) recordings.
Call recordings are converted on your device and never uploaded.
64 kbps keeps a one-hour call around 28 MB.
MP3 opens in Windows, macOS, iPhone, Android and every editor.
No. The conversion runs in your browser with a WebAssembly build of FFmpeg. Your file is read from your device and the result is saved back to it; nothing is sent to our servers.
AMR is a phone-network speech codec. Windows Media Player, iTunes and most desktop players don't include a decoder for it; MP3 plays everywhere.
AMR uses about 12 kbps, far less than any MP3 setting. The MP3 is larger but the quality is the same as the original recording.
No converter can restore detail the phone network removed. Increase Volume can make a quiet call louder.
Yes. Transcribe Audio to Text works on the AMR or the MP3, in your browser. Accuracy is lower on phone-quality audio.
Files up to 4 GB and 4 hours long on a computer, or 2 GB and 2 hours on a phone. The video is read in pieces rather than loaded into memory, so large recordings work; only the audio file being written has to fit in memory.
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