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.
Fast, easy transcription. Also the ability to edit in the software with the recording before exporting is a great feature. I have already recommended you to a friend.
Faster than my captioning department and so easy to create subtitles!
The entire process is extremely straightforward and what I liked most was the accuracy of the transcriptions and translations. I must say, I had some doubts as to ...
After trying a number of MP3 transcribers, I am most impressed with Sonix! It was easy to use and was much more accurate than any of the others that I tried.
I loovvvve that the audio is transcribed so quickly.
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AI transcription and translation in 53+ languages.
