Convert GSM to OPUS
Fast, free GSM to OPUS conversion — works in any browser
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gsm
GSM digital audio format
| File extension | .gsm |
|---|---|
| File category | audio |
| Programs | VLC media player Audacity Sox MPlayer |
| Tech description | https://en.wikipedia.org/wiki/Full_Rate |
| MIME type | audio/x-gsm |
| Developer | European Telecommunications Standards Institute (ETSI) |
Developed in Europe, this format was designed for mobile users. GSM is used for audio files that contain a large amount of audio information. Suitable for voice recordings, including recordings of phone calls. You can compress and archive a GSM file to achieve a different file size. The format is mostly used to create and store voice information. There are 4 types of this format that can be opened using different applications.
opus
Opus — Open Audio Codec for Voice and Music
| File extension | .opus |
|---|---|
| File category | audio |
| Programs | VLC media player foobar2000 MPV Audacity Firefox |
| Tech description | https://en.wikipedia.org/wiki/Opus_(audio_format) |
| MIME type | audio/ogg; codecs=opus audio/opus |
| Developer | Xiph.Org, IETF |
Opus is a free, open-source audio codec developed by Xiph.Org and the IETF, standardized in 2012 (RFC 6716). It supports bitrates from 6 kbps to 510 kbps, covering both low-bitrate voice calls and high-quality music streaming with a single codec. Opus consistently outperforms MP3, AAC, and Vorbis at equivalent bitrates in independent listening tests. It is used by YouTube, Spotify, Discord, WhatsApp, Zoom, and WebRTC applications. Opus is natively supported in Firefox, Chrome, Edge, and most modern media players including VLC, MPV, and foobar2000, across Windows, macOS, Linux, Android, and iOS.
FAQ
How to convert OPUS to GSM?
Upload your OPUS file, select GSM as the output format, and click Convert. The converted file will be ready to download in seconds — no account or installation required.
How long does it take to convert OPUS to GSM?
Most OPUS files convert in seconds. Larger files may take up to a few minutes depending on size and internet speed. You can track the progress bar in real time during conversion.
Is it safe to convert OPUS files online?
Yes. All uploaded OPUS files and converted GSM results are automatically deleted from our servers within 1 hour after conversion. We do not store, share, or access your files.
Can I convert OPUS on iPhone or Android?
Yes, our converter works on all devices and operating systems — iPhone, iPad, Android, Windows, and macOS. Open the site in your mobile browser, upload the OPUS file and convert to GSM without installing any app.
