Convert AMR to AAC — Free Online Converter
Convert Adaptive Multi-Rate Audio (.amr) to Advanced Audio Coding (.aac) online for free. Fast, secure audio conversion with no watermarks or registra...
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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.
About AMR to AAC Conversion
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.
Why Convert AMR to AAC?
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.
Common Use Cases
- Make a phone interview recording playable in a web browser
- Import a voicemail into a podcast editing timeline
- Embed a voice note in a PowerPoint or Keynote presentation
- Prepare a call recording for upload to cloud storage with preview support
- Share voice memos via email without attachment compatibility issues
How It Works
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.
Quality & Performance
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 Compatibility
| Device | AMR | AAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tips for Best Results
- 1Choose 64 kbps for standard phone-quality AMR recordings — higher bit rates waste space without audible benefit.
- 2If the destination is an Apple device, consider M4A output instead, which is AAC in an MPEG-4 container with better metadata support.
- 3For voice memos destined for podcasts, convert to AAC mono to cut file size in half while matching spoken-word standards.
- 4Test playback on the target device after conversion — AMR-NB's limited 3.4 kHz bandwidth can sound muffled on speakers expecting full-range audio.
Related Conversions
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.