Sonix transcribes your OPUS file and creates closed captions that make your content accessible to everyone.
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
Sign up for Sonix's free trial. Includes 30 minutes free.
Upload your OPUS file from your computer or cloud storage.
Choose from 53+ languages spoken in your file.
Sonix AI transcribes your OPUS with word-level timestamps.
Fine-tune timing and formatting for accessibility.
Download closed captions in SRT, VTT, or SCC format.
Yes! Sonix transcribes your OPUS 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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AI transcription and translation in 53+ languages.
