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GSM to Opus - Online Audio Converter
Convert GSM to Opus online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert GSM to Opus
Drop GSM audio here or click to select
GSM
Opus (Opus)
About GSM to Opus
Convert GSM to Opus. GSM 06.10 encodes European mobile speech at 13 kbps. Opus adapts from 6 kbps speech to 510 kbps music with low latency. CD-era hardware may not decode it; use MP3 for legacy players..
Why convert GSM to Opus?
- Smaller files with Opus lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
GSM vs Opus
| Codec | GSM | Opus |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | GSM 06.10 encodes European mobile speech at 13 kbps. | Opus adapts from 6 kbps speech to 510 kbps music with low latency. |
When not to convert GSM to Opus
- Skip Opus for archival masters: lossy compression discards detail, so keep the GSM original.
- Keep a master copy: repeated exports stack small losses, so archive GSM before batch Opus shares.
Limits
Starting point: GSM - GSM 06.10 encodes European mobile speech at 13 kbps. Carrier framing can offset timing; verify duration. CD-era hardware may not decode it; use MP3 for legacy players. Encode Opus (Opus) from GSM 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 GSM to Opus?
Drop your GSM file onto this page, choose quality and codec settings, then click Convert. The result downloads as Opus instantly. All processing runs in your browser.
What codec is used for Opus?
The default codec for Opus is Opus. 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.