Sonix transcribes your OPUS file and exports it as WebVTT captions perfect for HTML5 video and web platforms.
Modern audio codec optimized for voice and streaming
The OPUS file is an audio file format that was created for use in Voice over IP (VoIP), video conferencing, or in-game chat. Since the OPUS codec is primarily used in Internet streaming applications, it isn't common. However, is it a lossy audio format that uses both SILK (used by Skype) and CELT (from Xiph.Org) codecs and supports variable bit rates from 6 kb/s to 510 kb/s.
State-of-the-art codec for voice; excellent at low bitrates
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Upload your OPUS file from your computer or cloud storage.
Choose from 53+ languages spoken in your file.
Sonix AI transcribes and timestamps your OPUS audio.
Fine-tune caption timing and text with our editor.
Download your OPUS captions as a WebVTT file.
Yes! Sonix transcribes your OPUS file with precise timestamps and exports it as WebVTT captions for web video.
WebVTT (Web Video Text Tracks) is the native caption format for HTML5 video. It's supported by all modern browsers and video platforms.
Use VTT for web video (HTML5) and SRT for video editors. VTT supports advanced styling like colors and positioning.
Yes! VTT supports CSS styling for colors, fonts, positioning, and more. Customize how your captions appear on screen.
VTT is supported by Chrome, Firefox, Safari, Edge, and all modern browsers. It's the web standard for video captions.
Absolutely! VTT works seamlessly with video.js, Plyr, JW Player, and other HTML5 video players.
VTT is the web standard for captions, supported by all modern browsers.
Apply CSS styling for colors, fonts, positioning, and more.
Word-level timestamps ensure perfect sync with your video.
Works with all HTML5 video players and web platforms.
Sonix is just so smooth and simple. Love it. No bugs, very intuitive. Oh and your software is surprisingly accurate!
The transcript came through almost word perfect from a video file. Your system is absolute MAGIC!
It is so easy to use, very intuitive. Everything 'works'. It is so simple and hassle-free.
Found you through Google. Super easy to use. Transcribed 98% correctly even though it was not a great audio file.
Awesome and I was really shocked when I saw how carefully my mp3 file was transcribed!!
Sonix provided the best transcription of all the platforms I have tested so far.
Sonix is by far the best transcription tool I have ever used.
The interface and editor experience were great. I also like the way you handle speaker identification and naming. Pretty slick. Nice timestamp frequency / formatting too.
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AI transcription and translation in 53+ languages.
