Convert Adaptive Multi-Rate Audio (.amr) to Advanced Audio Coding (.aac) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — 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 .aac file when it's ready.
AMR files are produced by phone networks for voice calls and voicemails, encoding speech at extremely low bit rates (4.75-12.2 kbps for AMR-NB). AAC (Advanced Audio Coding) is the successor to MP3 and the default audio codec on Apple devices, streaming services, and YouTube. Converting AMR to AAC elevates a narrow-band telephony recording into a format understood by every modern device and platform.
AMR files sound tinny and lack support outside of dedicated voice-recording apps. AAC provides dramatically better codec efficiency — even at 64 kbps, AAC delivers clearer output than AMR at its maximum 12.2 kbps. More importantly, AAC is universally supported: iPhones, Android phones, web browsers, Windows Media Player, and macOS all play AAC natively. Converting also lets you embed the audio in podcasts, presentations, and web pages where AMR would be rejected.
FFmpeg decodes the AMR-NB or AMR-WB audio to PCM, then re-encodes it using the native AAC encoder at a target bit rate of 64-128 kbps (configurable). Because AMR is band-limited to 300-3400 Hz (narrow-band) or 50-7000 Hz (wide-band), the AAC output faithfully reproduces the available frequency content without inventing detail that was never captured.
The output will sound as good as the source AMR recording allows. AMR-NB speech tops out at 3.4 kHz bandwidth, so do not expect hi-fi results. AAC encoding at 64 kbps is more than sufficient to preserve every nuance in the original voice recording. AMR-WB sources will sound noticeably wider and cleaner after conversion.
| Device | AMR | AAC |
|---|---|---|
| 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
Converting AMR to AAC is the recommended path when you need voice recordings to play on Apple devices, browsers, or any modern platform without installing special codecs.
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Працює всюди
Будь-який браузер, будь-який пристрій
| No |
| Характеристика | AMR | AAC |
|---|---|---|
| Повна назва | Adaptive Multi-Rate Audio | Advanced Audio Coding |
| Розширення | .amr | .aac |
| Найкраще для | Speech optimized | Superior to MP3 |