All Tools
[ audio bench ]
AU to GSM - Online Audio Converter
Convert AU to GSM online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AU to GSM
Drop AU audio here or click to select
AU
GSM (GSM)
About AU to GSM
Convert AU to GSM. AU is Sun's simple container, usually holding 8 kHz telephony audio. GSM 06.10 encodes European mobile speech at 13 kbps. Carrier framing can offset timing; verify duration..
Why convert AU to GSM?
- Smaller files with GSM lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AU vs GSM
| Codec | PCM 16-bit | GSM |
|---|---|---|
| Compression | uncompressed | lossy |
| Sample behavior | Full quality kept | Quality set by bitrate |
| Typical use | AU is Sun's simple container, usually holding 8 kHz telephony audio. | GSM 06.10 encodes European mobile speech at 13 kbps. |
When not to convert AU to GSM
- Skip GSM for archival masters: lossy compression discards detail, so keep the AU original.
- Keep a master copy: repeated exports stack small losses, so archive AU before batch GSM shares.
Limits
Starting point: AU - AU is Sun's simple container, usually holding 8 kHz telephony audio. Headers are minimal; verify sample rate after conversion. Carrier framing can offset timing; verify duration. Encode GSM (GSM) from AU 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.
Related conversions
FAQ
How do I convert AU to GSM?
Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as GSM instantly. All processing runs in your browser.
What codec is used for GSM?
The default codec for GSM is GSM. 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.