AMR to MP3 Converter
Convert AMR to MP3 so old call recordings and voice notes from phones play on any computer, phone or messaging app. Each .amr file is decoded on your own device by an FFmpeg engine running in the browser and saved as an MP3, so conversations that should stay private are never uploaded. Convert a whole folder at once, free.
- Runs on your device
- FFmpeg
- WebCodecs · GPU
- Works offline
Updated
Drop your audio files here
How to convert AMR to MP3
Step 1: Copy the .amr recordings to your computer or find them in your phone’s file manager, then drop them on the box above.
Step 2: Keep Bitrate at 64 kbps; AMR is narrow-band speech, so more only makes the file bigger.
Step 3: Press Convert. The FFmpeg engine (about 31 MB) downloads on first use and is cached.
Step 4: Download the MP3s, one at a time or as a ZIP.
Good to know
Settings explained
- Bitrate
- 128 kbps is fine for speech, 192 kbps for music, 320 kbps is the MP3 maximum.
- OGG codec
- Godot, Unity and older players need Vorbis. Vorbis uses the FFmpeg engine (≈31 MB, downloaded once).
- Opus: Smaller
- Vorbis: Games, older players
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- FFmpeg (when needed)
- Older formats and a few filters use FFmpeg compiled to WebAssembly. It downloads once (about 31 MB) the first time it is needed and is cached for offline use.
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
What is an AMR file?
An AMR file holds speech compressed with Adaptive Multi-Rate, the codec designed for mobile phone calls. It is extremely small but sounds like a phone line, because it keeps only the voice band. Older Android phones, call recorders and voice-memo apps saved recordings in it, and most computers and browsers cannot play it today.
| AMR-NB (narrowband) | AMR-WB (wideband) | |
|---|---|---|
| Sample rate | 8 kHz | 16 kHz |
| Bitrates | 4.75–12.2 kbps | 6.6–23.85 kbps |
| Sound | Classic phone call | Clearer “HD voice” |
| One hour at the top bitrate | About 5.5 MB | About 10.7 MB |
How to convert call recordings to MP3
Find the recordings first: many recorder apps keep them in a folder named Recordings, Call or Sounds on the phone’s storage. Drop the .amr files here; an 8 kHz AMR becomes an 8 kHz mono MP3 at 64 kbps, which keeps everything the recording contains. If an old car stereo or player will not play that, set Sample rate to 22.05 kHz under Advanced settings and convert again.
How to play AMR files
VLC plays AMR directly, as do some phone apps, but many default players, web browsers, editors and messaging apps will not open it. Converting to MP3 is the simplest fix when you need to send a recording to someone else, add it to a document or open it in an editor.
Why convert AMR here
- Private. Call recordings are some of the most sensitive audio there is; they are decoded on your device, never on a server.
- No software. No codec packs or desktop converters to install.
- Batch. A whole folder of recordings converts in one run.
Tips & troubleshooting
Need the conversation as text? Audio to text transcribes the MP3 on your device.
Recording too quiet or noisy? Use the volume booster or the noise reducer after converting.
Several formats in one folder? The MP3 converter handles AMR, M4A, WAV and more together.
AMR to MP3 Converter FAQ
What is an AMR file?
An audio file compressed with the Adaptive Multi-Rate speech codec, used by mobile phones and older Android call and voice recorders. It is tiny but sounds like a phone call, and most computers cannot open it.
Does converting AMR to MP3 improve the sound?
No. The MP3 keeps exactly the phone-quality sound of the recording. It simply plays on far more devices and apps.
Why is the MP3 bigger than the AMR?
AMR is built only for speech and runs at about 12 kbps; a 64 kbps MP3 uses more data per second. It is still small: about 29 MB per hour.
Are my call recordings uploaded?
No. Every file is decoded and converted inside your browser on your own device, so the recordings are never sent anywhere.