Convert Adaptive Multi-Rate Audio (.amr) to MPEG-4 Audio (.m4a) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings โ add a file to adjust
Upload your .amr file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .m4a file when it's ready.
AMR is the voice codec of mobile telephony โ tiny files, speech-only quality, and limited device support outside of phones. M4A is the MPEG-4 audio container used by Apple for iTunes, Apple Music, and virtually all iOS/macOS audio playback. Converting AMR to M4A produces a compact, high-compatibility file with proper metadata support, album art embedding, and native recognition across Apple and Android platforms alike.
M4A is the most practical modern audio container for everyday use. Unlike raw AAC, M4A carries rich metadata (title, artist, album art, chapter marks), and every major platform supports it: iOS, macOS, Android, Windows 10+, and all modern web browsers. Converting AMR to M4A transforms a telephony artifact into a proper audio file you can organize in your music library, share via any messaging app, or upload to cloud storage with full preview support.
FFmpeg decodes the AMR audio to PCM and re-encodes it with the AAC-LC codec at 64-128 kbps inside an M4A (MPEG-4 Part 14) container. The moov atom is placed at the beginning of the file (faststart flag) for instant playback and streaming. The container supports full ID3-equivalent metadata through iTunes-style atoms.
AAC-LC at 64 kbps faithfully reproduces everything the AMR codec captured. For AMR-NB recordings (8 kHz, 3.4 kHz bandwidth), 64 kbps is transparent. For AMR-WB recordings (16 kHz, 7 kHz bandwidth), 96 kbps is recommended.
| Device | AMR | M4A |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
AMR to M4A is the recommended general-purpose conversion for voice recordings โ it gives you maximum compatibility, proper metadata, and compact file size.
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| No |
| ๊ธฐ๋ฅ | AMR | M4A |
|---|---|---|
| ์ ์ฒด ์ด๋ฆ | Adaptive Multi-Rate Audio | MPEG-4 Audio |
| ํ์ฅ์ | .amr | .m4a |
| ์ต์ ์ฉ๋ | Speech optimized | Better than MP3 |