How do I accurately convert my WEBM files to closed captions? 
Sonix uses the latest automated transcription technology to convert your video files (*.webm) 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 WEBM to captions conversion.
Step 2
Upload the WebM Video File file(s) (*.WEBM) from your computer, Dropbox, Google Drive, or by dragging it on the page.
Step 3
Choose the language spoken in the uploaded WEBM 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 WEBM 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 WEBM file. You can also adjust the character length and time duration length of each caption.
That's it! Your WEBM 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 WEBM files with Sonix 
Frequently Asked Questions for WebM Video File (*.WEBM) to subtitle 
What is a WEBM file?
WEBM is an open, high-quality video standard that is usually used for delivering online videos using the HTML <video> tag. WEBM is a container file format: the video stream is usually compressed with the VP8 codec and the audio stream is compressed with the Ogg Vorbis codec. The WEBM container format itself is based off of the popular Matroska container (MKV files). Since WEBM is an alternative to the patented H.264 and MPEG4 formats and widely supported by most major web browsers, it is used in both commercial and non-commercial applications. The WEBM file format was created by Google to store video content and implement compression standards optimized for video streaming over broadband and mobile internet connections. Thus, royalty-free video compression technologies were used (VP8/VP9 and Ogg Vorbis). In addition, WebVTT subtitle tracks can we included within a WEBM file. WEBM files are also widely supported by Chrome, Safari, Firefox, and Internet Explorer.
Does Sonix transcribe video files with a *.WEBM file extension?
Yes, Sonix does automatically transcribe video files with a .WEBM file extension. Sonix is an online video to text converter. Convert any audio (mp3, m4a, wav, ...) or video (webm, mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.WEBM files and converts them to text in a subtitle format.
Know anyone who needs to convert WebM Video File (.WEBM) to subtitle?
We'd appreciate it if you tell them about Sonix—the best way to convert WEBM to subtitle.
Other ways to convert your WEBM video files with Sonix
WEBM to text
Use the most accurate speech-to-text technology to convert files: WEBM to text.
WEBM to docx
Accurately transcribe your WEBM file to Microsoft Word Format (docx) so you can bring the transcript into your workflow.
WEBM to PDF
Easily transcribe your WEBM file to Adobe's Portable Document Format (pdf) so you can share them with colleagues.
WEBM to subtitles
Create subtitles for your WEBM files to make them more accessible for your audience.
WEBM to srt
Quickly create subtitles from your WEBM files and save them as SRTs, one of the most widely supported subtitle formats.
WEBM to VTT
Create more advanced captions for your WEBM files by using the latest caption format VTT (Video Text Tracks).
Add subtitles to WEBM files
Quickly and easily add subtitles to your MP4 video files with the power of automated transcription.
Create closed captions from your WebM Video 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 WebM Video File files to captions. Fast, accurate, and affordable. Millions of users from all over the world.
Includes 30 minutes of free transcription
