MP3 to AMR Converter
Initializing... drag & drop files here
Supports: MP3
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
Reset to defaults
Need help?MP3 to AMR Converter
AMR (Adaptive Multi-Rate) is the low-bitrate speech codec built into mobile phones for voice memos, voicemail, push-to-talk, and MMS audio. Converting an MP3 to AMR shrinks a spoken-word recording to a fraction of its size and makes it playable on older handsets and telephony systems that expect AMR. One important caveat up front: AMR is tuned for speech, not music — it filters audio down to a narrow voice band, so a music MP3 converted to AMR will sound thin and muffled. Use this for voice recordings, not songs.
Why AMR Is a Speech Codec, Not a Music Format
AMR narrowband filters the signal to roughly 200–3400 Hz — the telephone voice band — and encodes it at 8 kHz sampling, mono only. That is enough to carry an intelligible human voice but throws away the high frequencies and stereo image that music needs. The payoff is size: at its top 12.2 kbit/s mode, about a minute of AMR audio is only ~90 KB, which is why GSM networks and voicemail systems adopted it. If your source MP3 is music and you want a small file that still sounds good, convert to Opus or OGG instead; reserve AMR for spoken-word audio where the small size and phone compatibility actually matter.
AMR Narrowband (AMR-NB) at a Glance
| Property | Value |
|---|---|
| Standard | 3GPP speech codec (adopted October 1999) |
| Sampling rate | 8 kHz, mono |
| Audio bandwidth | ~200–3400 Hz (narrowband / voice) |
| Bitrate modes | 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2, 12.2 kbit/s |
| File extension | .amr (also .3ga) |
| Best for | Voice memos, voicemail, MMS, push-to-talk, ringtones |
| Container | Raw .amr, or the 3GP container (ISO base media format) |
AMR Wideband (AMR-WB / G.722.2) at a Glance
| Property | Value |
|---|---|
| Standard | 3GPP / ITU-T G.722.2 (specified from 2002) |
| Sampling rate | 16 kHz, mono |
| Audio bandwidth | 50–6400 Hz (up to 7000 Hz at the top mode) |
| Bitrate modes | 6.60 to 23.85 kbit/s (nine modes) |
| File extension | .awb (wideband) |
| Best for | HD Voice / VoLTE calls, clearer speech recordings |
Both narrowband and wideband are selectable in this converter under the codec setting. Wideband doubles the sampling rate to 16 kHz and roughly doubles the usable voice bandwidth, so it sounds noticeably clearer than narrowband while still staying small — but it remains a mono speech codec, not a music format.
How to Convert MP3 to AMR
- Upload Your MP3 File: Drag and drop your MP3 onto the page, or click "+ Add Files" to browse. You can queue several voice recordings and convert them in one batch.
- Pick the Codec (AMR Narrow Band or AMR Wide Band): Open Advanced Options and choose AMR Narrow Band for maximum compatibility with older phones and MMS, or AMR Wide Band for clearer speech where the receiving device supports it.
- Set Audio Sample Rate, Channel, and Bitrate (Optional): AMR-NB defaults to 8000 Hz mono; use the Quality Preset or Constant Bitrate controls to trade size against clarity, and the Trim control to keep only the part of the recording you need.
- Convert and Download: Click "Convert" and download your
.amrfile. No sign-up, no watermark.
Frequently Asked Questions
Why does my music sound bad after converting MP3 to AMR?
Because AMR is a speech codec. AMR narrowband filters everything outside roughly 200–3400 Hz and encodes in mono at 8 kHz, so cymbals, bass, and stereo separation are simply discarded. That is by design — the codec was built to carry a human voice over a phone network in as few bits as possible. For music you want a small file, convert to Opus or OGG rather than AMR.
What is AMR used for?
AMR is the speech format mobile phones use internally: voice memos, visual voicemail, push-to-talk, and the audio inside MMS messages. It was adopted by 3GPP in 1999 as the standard speech codec for GSM and 3G, so it plays natively on a huge range of handsets and telephony systems without extra software.
Should I pick AMR Narrow Band or AMR Wide Band?
Pick AMR Narrow Band (8 kHz) when you need the smallest file or compatibility with older phones, MMS, and voicemail systems — it is the most universally supported variant. Pick AMR Wide Band (16 kHz, the G.722.2 / HD Voice codec) when the playback device supports it and you want clearer, more natural-sounding speech. Both are mono speech codecs, so neither is suitable for music.
How small will my file get?
Small. At AMR-NB's top 12.2 kbit/s mode, roughly one minute of audio is about 90 KB; lower modes down to 4.75 kbit/s are smaller still. In our testing, a 3-minute spoken-word MP3 (about 4 MB at 192 kbps) dropped to well under 200 KB as 12.2 kbit/s AMR — a large reduction, because most of an MP3's bits go to frequencies AMR deliberately discards.
Can I play an AMR file on a computer?
Yes, but not always out of the box. AMR is universal on phones but is not as widely recognized on desktops as MP3 or WAV, so some media players need an extra codec. If you need a recording to play everywhere without fuss, convert back with AMR to MP3; use AMR specifically when you need the small size or phone/telephony compatibility.
Does converting MP3 to AMR ever improve quality?
No — it can only reduce it. AMR is lossy and narrowband, so the output never sounds better than the MP3 source; it sounds smaller. The reason to convert is compatibility and file size for speech, not fidelity. If your goal is a smaller MP3 that keeps full audio quality, compress the MP3 instead of switching to AMR.
Is the conversion private?
Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.