How do I accurately convert my OPUS files to closed captions? 
Sonix uses the latest automated transcription technology to convert your audio files (*.opus) to closed captions. Follow these six steps and see how magical it is:
Step 1
Sign up for a free Sonix trial account—includes 30 minutes of free OPUS to captions conversion.
Step 2
Upload the Opus Audio File file(s) (*.OPUS) from your computer, Dropbox, Google Drive, or by dragging it on the page.
Step 3
Choose the language spoken in the uploaded OPUS file. We support over 49 different languages including Russian, Chinese, Spanish, and English. Click the 'Start Transcribing Now' button.
Step 4
Sonix will then automatically transcribe the audio from your OPUS file and convert it to a simple text format. Grab a cupcake, it will take only a few minutes.
Step 5
Use the Sonix AudioText Editor to polish your transcript before we convert it to a caption file. Simply type in your browser to correct any words in your transcript.
Step 6
Click the 'Export' button. Choose either 'Subrip subtitle file (.srt)' or 'WebVTT file (.vtt)' from the dropdown to download the closed caption version of your OPUS file. You can also adjust the character length and time duration length of each caption.
That's it! Your OPUS file has now been converted to closed captioning and is ready for the next step in your workflow!
Thousands of customers create closed captions from their OPUS files with Sonix 
Frequently Asked Questions for Opus Audio File (*.OPUS) to subtitle 
What is a OPUS file?
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.
Does Sonix transcribe audio files with a *.OPUS file extension?
Yes, Sonix does automatically transcribe audio files with a .OPUS file extension. Sonix is an online audio to text converter. Convert any audio (opus, mp3, m4a, wav, ...) or video (mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.OPUS files and converts them to text in a subtitle format.
Know anyone who needs to convert Opus Audio File (.OPUS) to subtitle?
We'd appreciate it if you tell them about Sonix—the best way to convert OPUS to subtitle.
Other ways to convert your OPUS audio files with Sonix
OPUS to text
Use the most accurate speech-to-text technology to convert files: OPUS to text.
OPUS to docx
Accurately transcribe your OPUS file to Microsoft Word Format (docx) so you can bring the transcript into your workflow.
OPUS to PDF
Easily transcribe your OPUS file to Adobe's Portable Document Format (pdf) so you can share them with colleagues.
OPUS to subtitles
Create subtitles for your OPUS files to make them more accessible for your audience.
OPUS to srt
Quickly create subtitles from your OPUS files and save them as SRTs, one of the most widely supported subtitle formats.
OPUS to VTT
Create more advanced captions for your OPUS files by using the latest caption format VTT (Video Text Tracks).
Create closed captions from your Opus Audio File files with Sonix 
Sonix automatically transcribes and translates your audio/video files in 49+ languages. Easily search, edit, and share your media files. Sonix is an online, fully-automated speech to text service that quickly converts Opus Audio File files to captions. Fast, accurate, and affordable. Millions of users from all over the world.
Includes 30 minutes of free transcription
