Play GSM files in your browser
The voice format of early mobile calls, still used by phone systems for voicemail and prompts. Play a GSM file right here. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your sound starts playing the moment it opens, its whole waveform across your screen.
- Its whole waveform • Press or drag to jump
- Back and ahead 10 seconds • Half, 1.5× or double speed
- Show tags • Title, artist, album and cover
- Export • Save as MP3 or WAV
About GSM
ETSI chose GSM 06.10, full rate speech, for the first digital mobile calls in 1990. Phone systems like Asterisk still save voicemail, prompts and call recordings as raw .gsm files to keep them small.
A .gsm file is the bare GSM stream with no header: 33 bytes for every 20 milliseconds of 8 kHz speech, 13 kbps.
No browser plays GSM by itself. Filepeek decodes it with FFmpeg inside your browser, and Export saves an MP3 or a WAV.
GSM 06.10 audio
.gsm
Format
- MIME type
- application/octet-stream
- Made by
- ETSI
- Released
- 1990
Inside the file
- Audio
- GSM 06.10 full rate
- Bitrate
- 13 kbps
- Sample rate
- 8 kHz mono
- Header
- None
Opens in every browser
No browser plays GSM by itself. Filepeek decodes it with FFmpeg in Chrome, Edge, Firefox and Safari.
- YouChromePlays through Filepeek
- YouEdgePlays through Filepeek
- YouFirefoxPlays through Filepeek
- YouSafariPlays through Filepeek
Questions
How do I play a .gsm voicemail?
Drop it on this page or press Peek a GSM. It plays right away.
Can I convert it to WAV or MP3?
Yes. Choose Export, then Save as WAV or MP3.
What about GSM inside a WAV?
WAV files that hold GSM, from Windows and phone systems, play here too.
Is my recording uploaded?
No. The recording opens inside your browser and never leaves your device.