GSM Converter
Convert GSM audio files to MP3, WAV, OGG, FLAC, M4A and AAC and 8 more formats — free, in batches, files up to 10 GB, with no sign-up and no watermark.
Drop your GSM file
Choose the format you need
Download the result
Choose file
or drag & drop — audio or video files
Free · Unlimited · No sign-up · Max 10 GB
Your privacy is our mission. Most files are converted right in your browser and never leave your device. Only large files, or formats a browser cannot process, are sent to our server over an encrypted connection — they are never stored, never shared, and deleted as soon as your download is ready.
What Is a GSM File?
GSM is the speech codec of the original digital mobile network. Phone systems and call recorders such as Asterisk still store voicemail and recordings in it. GSM is a lossy format: it makes files small by discarding detail that is hard to notice. Converting it to another format cannot bring that detail back.
GSM Facts
| Full name | GSM Full Rate (06.10) |
|---|---|
| File extension | .gsm |
| Type | Audio |
| How it stores data | Lossy speech compression at 13 kbit/s |
| Created by | ETSI |
| Best for | telephony systems and voicemail |
| Watch out | telephone quality only, and almost no consumer player opens it |
| Opens with | VLC, Audacity, telephony software |
How to Open a GSM File
A .gsm file opens with VLC, Audacity, telephony software. If none of those is at hand — or the file has to go into a program, device or website that refuses GSM — convert it: MP3, WAV and OGG are the usual choices.
Convert GSM to Another Format
Frequently Asked Questions
What is a GSM file?
GSM is the speech codec of the original digital mobile network. Phone systems and call recorders such as Asterisk still store voicemail and recordings in it.
How do I open a .gsm file?
With VLC, Audacity, telephony software. If your device or program does not accept it, convert the file to a format it does.
How do I convert a GSM file?
Drop the file into the converter on this page, choose the target format — MP3, WAV, OGG, FLAC and M4A and others — and press Convert. It is free, there is no account and several files can be converted at once.
Is GSM lossy or lossless?
GSM is a lossy format: it makes files small by discarding detail that is hard to notice. Converting it to another format cannot bring that detail back.
What is GSM good for, and what are its limits?
Best for: telephony systems and voicemail. Watch out: telephone quality only, and almost no consumer player opens it.
Is the GSM converter free, and how big can the files be?
It is free, with no account, no watermark and no daily limit. Files can be up to 10 GB each.