AMR to MP3 Converter
AMR is the speech codec mobile networks were built on, and phones still use it for call recordings and voice memos. Most computers and music apps will not open the file, so converting to MP3 is the quickest way to listen, share or archive it.
Audio Converter
or drop MP3, WAV, M4A … files here ·
Max 95 MB per file· Up to 20 files· Deleted after 30 minutes
Files are processed on our servers and deleted after 30 minutes.
Constant bitrate (CBR) gives a predictable size and works on every player. Variable bitrate (VBR) spends bits where the music needs them and is usually smaller at the same quality.
Keep the source rate unless a device asks for one. 44.1 kHz is CD standard, 48 kHz is video standard, 8 kHz is used by phone systems and AMR.
Mono halves the size of lossless files and is fine for voice recordings.
16-bit is CD quality. 24-bit keeps headroom for editing and mastering; converting a 16-bit source up does not add detail.
Optional. Seconds (e.g. 75) or minutes:seconds (1:15). Leave empty to start at the beginning.
Optional. Same format as the start time. Leave empty to keep everything up to the end.
How to use this tool
- 1
Upload the .amr or .3ga files
Add up to 20 recordings, each up to 95 MB. An AMR file is tiny, so even hours of calls fit easily.
- 2
Keep the speech settings
The page is set to 64 kbps, Mono and 22.05 kHz, which holds everything an AMR recording captured. Tick Normalise volume if the other side of the call is faint.
- 3
Press Convert to MP3
Each recording is decoded and saved as MP3. Download them individually or as a ZIP; uploads are deleted after 30 minutes.
Upload your .amr file and press Convert to MP3. The page is preset to 64 kbps mono, which preserves everything an AMR recording holds and plays on every computer, phone and car stereo.
Where AMR recordings come from
Adaptive Multi-Rate audio was adopted by 3GPP in 1999 as the voice codec for GSM and later 3G networks. Its narrowband version switches between eight bitrates from 4.75 to 12.2 kbps to survive weak signals, and the wideband version, AMR-WB, became the basis of HD Voice calls. Because the codec was already inside every phone chip, phone makers used it for recordings too.
That is why AMR files turn up in call-recording folders on Android phones, in voice memos from older Nokia, Samsung and BlackBerry handsets, and in recordings exported from some dictation and security apps. Lawyers, journalists and family archivists end up with folders of them. Many desktop music players, Apple's Music app and most editing software do not open AMR, while MP3 opens everywhere. For newer recordings from iPhone voice memos, use M4A to MP3 instead.
AMR to MP3 on Android, iPhone and PC
Android
- 01Open the Files app and look in Recordings, Call or Sounds
- 02Open this page in the phone's browser
- 03Tap the upload area and pick the .amr files
- 04Download the MP3 into your Downloads folder
iPhone
- 01Save the received .amr attachment to the Files app
- 02Open this page in Safari and tap the upload area
- 03Choose Browse and select the file
- 04Save the MP3 back to Files or share it
Windows or Mac
- 01Copy the recordings from the phone over USB or cloud storage
- 02Drag up to 20 files onto the upload area
- 03Download them together as a ZIP
AMR bitrate and MP3 file size
12.2 kbpsthe highest bitrate of narrowband AMR, about 91 KB per minute of speech
Raising the MP3 bitrate past 64 kbps does nothing for an AMR source; the recording was limited by the codec and its 8 kHz sample rate long before it reached you. 64 kbps is also the lowest Bitrate on offer, which keeps a large call archive at under half a megabyte per minute.
Going the other way is also possible. Some older phones and IVR systems only accept AMR ringtones or prompts, and MP3 to AMR handles that direction.
AMR and MP3 compared
AMR
Adaptive Multi-Rate audio
AMR is a lossy speech codec adopted by 3GPP in 1999 for GSM and 3G mobile phone calls. It is optimised for voice at very low bitrates, so music sounds poor. Many phones save call recordings and voice memos as AMR files. Browsers, iPhones and many desktop players do not support it.
- Compression
- Lossy
- Transparency
- –
- Animation
- –
- Introduced
- 1999 · 3GPP (Ericsson, Nokia, Siemens)
MP3
MP3 audio
MP3 (MPEG-1 Audio Layer III) is a lossy audio format developed largely at the Fraunhofer Institute and standardised by MPEG in 1993. It removes sounds the ear is unlikely to notice, shrinking music to about a tenth of CD size at 128–320 kbps. All patents have expired, and every phone, car stereo, browser and media player supports it. Quality loss is audible at low bitrates and accumulates with re-encoding.
- Compression
- Lossy
- Transparency
- –
- Animation
- –
- Introduced
- 1993 · Fraunhofer IIS / MPEG
AMR call recordings and old phone memos open in almost no desktop player, editor or upload form; MP3 makes them playable on any computer while keeping the files small, since the speech band AMR captured needs only a modest bitrate.
AMR to MP3 questions
Why does the MP3 still sound like a phone call?
AMR-NB samples at 8 kHz, so it only captures frequencies up to about 4 kHz, the classic telephone band. MP3 keeps exactly what was recorded and cannot recreate the missing highs, at any bitrate.
Why is my MP3 several times bigger than the AMR file?
AMR was designed for mobile networks and squeezes speech into at most 12.2 kbps for the narrowband version. MP3 is a general-purpose codec and needs around 64 kbps to sound clean, so the file grows roughly five times. It is still under half a megabyte per minute.
Can I convert .3ga recordings from a Samsung phone?
Yes. Samsung's voice recorder and some call-recording apps save audio in a 3GP container with the .3ga extension, usually holding AMR or AAC audio. Both are read here and come out as ordinary MP3.
Will the caller's number and the call date carry over?
Usually not, because phones store that information in the file name or the recorder app's database, not inside the AMR audio. Rename the MP3 after downloading if you need the date and contact in the file name.
Why not keep the 8 kHz sample rate in the MP3?
MP3 only reaches 8 kHz through MPEG 2.5, an unofficial extension that some players and editors reject. 22.05 kHz is part of the official MPEG-2 standard, plays everywhere and adds almost no size at 64 kbps.
Can I turn an AMR call recording into text?
Convert it to MP3 first, then run it through audio to text. Clear, normalized speech gives better transcripts, so tick Normalise volume for quiet calls.
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