GSM to FLAC converter
Convert GSM to FLAC in seconds, free and unlimited. No upload, no sign-up, no watermark: your audio never leaves your device.
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Quick answer: To convert GSM to FLAC, add the GSM file to the iHateFiles GSM to FLAC converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. GSM is a format most software has stopped opening. FLAC is not.
Should you convert GSM to FLAC?
Do this when an editor, DAW or device needs FLAC. It will not make the GSM sound any better, and the file grows several times over.
FLAC will not restore what GSM removed
FLAC stores every sample exactly, including the damage GSM compression already did. Expect 5 to 7 MB per minute instead of about 0.1 MB, for audio that sounds identical. Do it because an editor or device needs FLAC, not to improve the sound.
GSM was made for voices
GSM is a phone-call codec that keeps only the frequencies speech needs, roughly up to 4 kHz. Converting to FLAC makes the recording open everywhere, but it will still sound like a phone call, because the rest of the sound was never recorded.
Where the FLAC will play
FLAC plays on VLC, Android, Windows 10 and later, and recent Macs.
GSM and FLAC side by side
| GSM | FLAC | |
|---|---|---|
| Inside the file | GSM full-rate speech | FLAC |
| Compression | Lossy | Lossless |
| Carries sound | Yes | Yes |
| One minute of stereo | about 0.1 MB | 5 to 7 MB |
| Plays on | Needs converting first | VLC, Android, Windows 10 and later, and recent Macs |
| Here | Read only | Read and write |
What usually goes wrong
About the GSM. The quality ceiling is the codec, not the file. Converting to a higher bitrate cannot add back a frequency range that was never captured.
About the FLAC. Converting an MP3 to FLAC produces a large file that sounds exactly like the MP3. Lossless compression preserves what it is given, including the damage.
How to convert GSM to FLAC
- Add your GSM file. It is read from your disk and stays there.
- Check the settings. The output format is already set to FLAC.
- Press convert and the FLAC file is saved back to your device.
Questions
How do I convert GSM to FLAC?
Open this page, add your GSM file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this GSM to FLAC converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to FLAC lose quality?
FLAC is lossless, so this step throws nothing away. If the original was already a lossy format, the damage it did cannot be undone, but nothing further is lost.
Can I convert several GSM files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.