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AMR to AU - Online Audio Converter
Convert AMR to AU online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AMR to AU
Drop AMR audio here or click to select
AMR
AU (PCM 16-bit)
About AMR to AU
Convert AMR to AU. AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. AU is Sun's simple container, usually holding 8 kHz telephony audio. Headers are minimal; verify sample rate after conversion..
Why convert AMR to AU?
- Larger files than lossy shares with AU uncompressed quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AMR vs AU
| Codec | AMR-NB | PCM 16-bit |
|---|---|---|
| Compression | lossy | uncompressed |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. | AU is Sun's simple container, usually holding 8 kHz telephony audio. |
When not to convert AMR to AU
- Skip AU for the smallest share: lossless output stays large, so prefer a lossy target when sending AMR files.
- Keep a master copy: repeated exports stack small losses, so archive AMR before batch AU shares.
Limits
Starting point: AMR - AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. Tuned for voice calls, so music loses detail by design. Headers are minimal; verify sample rate after conversion. Encode AU (PCM 16-bit) from AMR at 256k for music or 128k for speech, starting from the master.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.
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FAQ
How do I convert AMR to AU?
Drop your AMR file onto this page, choose quality and codec settings, then click Convert. The result downloads as AU instantly. All processing runs in your browser.
What codec is used for AU?
The default codec for AU is PCM 16-bit. You can change audio parameters in Advanced mode.
How do you store my files?
We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.