Sonix transcribes your GSM file and creates timestamped subtitles in SRT, VTT, and other formats.
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.
Customize line length, duration, and subtitle breaks.
Download subtitles as SRT, VTT, or other formats.
Yes! Sonix transcribes your GSM file with word-level timestamps and creates professional subtitles in SRT, VTT, and other formats.
Export subtitles as SRT (most universal), VTT (web video), FCPXML (Final Cut Pro), and many more formats.
Yes! Adjust max characters per line, lines per caption, max duration, and manually fine-tune any timing.
Upload the SRT/VTT file to YouTube, Vimeo, or import into your video editor. You can also burn subtitles directly into the video.
Yes! Sonix can translate your subtitles into 54+ languages, making your content accessible globally.
Sonix achieves up to 99% accuracy. Use our editor to make any corrections before exporting.
Export subtitles as SRT, VTT, FCPXML, and more for any platform.
Control line length, duration, and style of your subtitles.
Create subtitles in 53+ languages from your original audio.
Permanently embed subtitles into your video with one click.
Sonix is simple and very easy to use and the results were very nearly perfect. I would definitely recommended the site to anyone who asks me.
Your product is amazing and transcribed my files almost all accurately!
It really accelerated my work and I was amazed by the accuracy, especially given that the video featured only non-native speakers.
No joke, this is the best service out there for qualitative research that involves a lot of audio primary data, and I’ve tried a lot of alternatives.
I tried 3 other tools online and I can say that sonix blows them out of the water. I was very impressed with the ease of use, the % of words correctly translated and how simple it ...
Sonix is faster and better than YouTube at making captions for my videos!
I've tried several different digital software packages and nothing has even approached giving me a usable transcription. The results from Sonix are the best I've seen. And fast. I'...
One of the best sites/services on the Internet I've ever tried.
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AI transcription and translation in 53+ languages.
