Sonix transcribes your GSM file and creates closed captions that make your content accessible to everyone.
Telephone-quality audio for voicemail and calls
GSM is a compressed audio stream that is primarily used by cell phones. GSM files are designed for telephone-quality audio use in Europe and stores audio mainly for telephone quality voice. It makes for a good balance between size of file and quality retention with data around 96KB per minute. GSM is primarily used for voicemail storage or to record phone conversations that will be played back later.
Telephone-grade audio; good for speech, not music
Sign up for Sonix's free trial. Includes 30 minutes free.
Upload your GSM file from your computer or cloud storage.
Choose from 53+ languages spoken in your file.
Sonix AI transcribes your GSM with word-level timestamps.
Fine-tune timing and formatting for accessibility.
Download closed captions in SRT, VTT, or SCC format.
Yes! Sonix transcribes your GSM file with precise timestamps and creates closed captions in standard formats.
Closed captions include non-speech elements like [music], [applause], and speaker identification. They're designed for deaf and hard-of-hearing viewers.
Yes! Sonix captions meet accessibility requirements when properly reviewed and edited. Our editor helps ensure timing and accuracy standards.
Export captions as SRT, VTT, SCC (for broadcast), and other formats. Each format has specific use cases.
Yes! Use our editor to add [music], [laughter], and other non-speech descriptions for full accessibility.
Absolutely! Captions make your video content searchable and improve accessibility, both of which can boost SEO rankings.
Create captions that make your content accessible to deaf and hard-of-hearing viewers.
Meet accessibility requirements with properly formatted closed captions.
Add non-speech elements like [music] and [applause] for full context.
Captions make video content searchable and improve discoverability.
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The speech to text was fast and very accurate.
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AI transcription and translation in 53+ languages.
