The best GSM to text converter

Sonix combines speed (10x real-time), accuracy (up to 99%), and affordability ($10/hour) with an easy-to-use interface. That's why experts rate us #1.

Sonix is faster and more accurate than most alternatives, while being more affordable than professional transcription services.

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Sonix achieves up to 99% accuracy using advanced AI. Results depend on audio quality and speech clarity.

Sonix converts GSM files 10x faster than real-time. A 30-minute file takes about 3 minutes.

Sonix is trusted by journalists, researchers, and businesses worldwide. Our editor and export options are built for professional workflows.

GSM is a telephony codec that many consumer media players do not decode by default. Players such as VLC can open it, or you can convert the file to WAV or MP3 for broader compatibility.

GSM was designed specifically for human speech at an 8 kHz sample rate, so clear voice recordings generally transcribe well. As with any phone recording, heavy background noise or overlapping speakers reduces clarity.