Quick Verdict
Use MP3 when…
Use MP3 for sharing voice recordings with anyone on any device. MP3 at 64 kbps is perfectly acceptable for voice quality and plays natively everywhere — Windows, Mac, iOS, Android, web browsers, car stereos, smart speakers.
Use AMR when…
AMR files should remain AMR only on the device that created them, for brief voice memos where file size is critical. Convert to MP3 or AAC before sharing, emailing, or uploading anywhere.
MP3 vs AMR: Feature Comparison
| Feature | MP3 | AMR |
|---|---|---|
| Audio type | General (music, voice, all) | Voice only |
| Bitrate range | 32–320 kbps | 4.75–23.85 kbps |
| Modern device support | Universal | Very limited |
| Music quality | Excellent at 192+ kbps | Terrible |
| Voice quality | Good at 64 kbps | Good at 12 kbps |
| Browser playback | All browsers | None |
| File size (1 min voice) | ~480 KB at 64 kbps | ~90 KB at 12.2 kbps |
When MP3 wins
- ✓Audio type: General (music, voice, all)
- ✓Bitrate range: 32–320 kbps
- ✓Modern device support: Universal
When AMR wins
- ✓Audio type: Voice only
- ✓Bitrate range: 4.75–23.85 kbps
- ✓Modern device support: Very limited
Frequently asked questions
How do I convert AMR voice memos to MP3?
FFmpeg: `ffmpeg -i voicememo.amr output.mp3` — FFmpeg handles AMR decoding without extra codecs. Online converters: Convertio and Zamzar accept AMR uploads. On Android: apps like Audio Converter (by Inshot) can batch-convert AMR files to MP3 directly on the phone. On Mac: install FFmpeg via Homebrew (`brew install ffmpeg`) and run the command above. Convert at 64–96 kbps for voice — higher bitrates don't improve quality since the original AMR quality is already limited.
Why can't I play AMR files on my Mac?
macOS doesn't include an AMR decoder. QuickTime, iTunes/Music, and the built-in audio player don't support AMR. VLC is the easiest free solution for playback (download from videolan.org). For permanent conversion, FFmpeg (`brew install ffmpeg`) converts AMR to MP3 or AAC. Apps like Permute 3 (Mac App Store) also handle AMR conversion with a drag-and-drop interface.
Is AMR a dying format?
Effectively yes for consumer use. Modern Android and iOS devices record voice memos in AAC or M4A by default. AMR still appears in 2G/3G voice call recordings, some VoIP systems, and legacy feature phones. The 3GPP standard still specifies AMR for mobile voice, so it persists in telecommunications infrastructure, but as an end-user format, you'll encounter it mainly with old recordings on older devices.
Ready to convert?
Free, browser-based converters — no upload, no signup required.
More comparisons
View all format comparisons →