Step 1
Upload video
Upload your WEBM video file to Sonix and select the language.
Add subtitles to WEBM videos
Sonix automatically transcribes your WEBM video and lets you add professional subtitles with customizable styling.
Auto-transcribe
Custom styling
Burn-in option
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
10x
Faster than real-time
Add subtitles to WEBM in minutes
99%
Accuracy rate
Industry-leading AI transcription
53+
Languages
Subtitles in any language
Custom
Styling
Fonts, colors, positioning
Add subtitles to WEBM in 4 steps
Step 2
Auto-transcribe
Sonix AI transcribes your video with word-level timestamps.
Step 3
Customize subtitles
Split subtitles, adjust timing, and customize fonts and colors.
Step 4
Export or burn-in
Download SRT/VTT files or burn subtitles directly into your video.
Everything about adding WEBM subtitles
Can Sonix add subtitles to WEBM videos?
Yes! Upload your WEBM video, and Sonix will transcribe it and let you add professional subtitles with customizable styling.
Can I burn subtitles into the video?
Yes! Sonix can permanently embed (burn-in) subtitles into your WEBM video with your choice of fonts, colors, and positioning.
What subtitle styles are available?
Customize fonts, colors, background boxes, positioning (top, center, bottom), and more for your burned-in subtitles.
Can I download subtitle files separately?
Yes! Export subtitles as SRT, VTT, or other formats to use with YouTube, Vimeo, or your video editor.
Can I translate subtitles to other languages?
Absolutely! Sonix can translate your subtitles into 55+ languages for multilingual videos.
How do I split subtitles correctly?
Sonix offers auto-split options for max characters per line, lines per caption, and max duration. Fine-tune manually if needed.
The easiest way to add video subtitles
Auto-Transcribe
Upload your WEBM and get accurate subtitles automatically.
Custom Styling
Choose fonts, colors, and positioning for professional results.
Burn-in Option
Permanently embed subtitles into your video with one click.
Translate
Create subtitles in 54+ languages from your original video.
More ways to work with WEBM files
Other WEBM conversions
Trusted by video creators
I’m stunned how much easier it makes life. I worked on documentary films and it cost us a fortune to have the interviews transcribed. The idea that this exists is mind-boggling to me.
Awesome and I was really shocked when I saw how carefully my mp3 file was transcribed!!
Sonix is top class. I would highly recommend Sonix. Especially working in a multi-lingual environment like the European Parliament.
I am very happy with the quality of the transcriptions! Having tried numerous other services, none can compare based on the quality for the value.
I loved how accurate you are even in Dutch!
Sonix is just so smooth and simple. Love it. No bugs, very intuitive. Oh and your software is surprisingly accurate!
What a great transcript experience! I love the work they are doing at Sonix. Their webpage is really simple to use and yet you get everything you need... most of t...
Holy Cow. It works. This just saved me freaking DAYS of my life. I am totally getting a Sonix tattoo now!
Add subtitles to WEBM now
Try Sonix free with 30 minutes of transcription. No credit card required.
