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Opus to GSM - Online Audio Converter
Convert Opus to GSM online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert Opus to GSM
Drop Opus audio here or click to select
Opus
GSM (GSM)
About Opus to GSM
Convert Opus to GSM. Opus adapts from 6 kbps speech to 510 kbps music with low latency. GSM 06.10 encodes European mobile speech at 13 kbps. Carrier framing can offset timing; verify duration..
Why convert Opus to GSM?
- Smaller files with GSM lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
Opus vs GSM
| Codec | Opus | GSM |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | Opus adapts from 6 kbps speech to 510 kbps music with low latency. | GSM 06.10 encodes European mobile speech at 13 kbps. |
When not to convert Opus to GSM
- Skip GSM for archival masters: lossy compression discards detail, so keep the Opus original.
- Keep a master copy: repeated exports stack small losses, so archive Opus before batch GSM shares.
Limits
Starting point: Opus - 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. Carrier framing can offset timing; verify duration. Encode GSM (GSM) from Opus 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 Opus to GSM?
Drop your Opus 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.