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Upload WEBM video and get accurately timed WebVTT captions in minutes, ready for HTML5 players and course platforms.
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Supports 20+ file formats including MP3, MP4, WAV
WebM is the open video format of the web. Browser screen recorders and many web-based recording tools save WebM files. Upload a .webm file and Scriptivox turns the speech in it into timed WebVTT captions, the subtitle format HTML5 video players and most course platforms use.
WebM files come from browser-based screen and webcam recorders, voice recorders in the browser and video downloads. Upload the .webm file as it is.
Leave it on auto-detect or pick one of more than 100 languages. Turn on speaker recognition when more than one person talks.
Read every line in the editor, fix any word, then download the .vtt file, ready for YouTube, your video editor or your player.
| Specification | Value |
|---|---|
| Container | WebM (Matroska profile) |
| Developed by | |
| Introduced | 2010 |
| Video codecs | VP8, VP9, AV1 |
| Audio codecs | Vorbis, Opus |
| Max resolution | 8K UHD |
| Typical bitrate (1080p) | 3–15 Mbps |
| Multiple audio tracks | Yes |
| Subtitle tracks | Embedded (soft) subtitles |
| Chapter markers | Yes |
| Streaming optimized | Yes |
| Licensing | Royalty-free |
| Plays natively on | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS, Smart TVs |
| Best for | web delivery, open-source projects, HTML5 video |
Advanced AI technology meets simple, intuitive design
Powered by next-generation AI designed for seamless speech understanding worldwide
Transcripts delivered in real time and large files processed in minutes, not hours.
Your data is protected with end-to-end encryption, privacy-first safeguards, and enterprise-grade security controls.
Supports uploads of up to 10 hours, designed for uninterrupted transcription of lengthy sessions.
Global coverage with accent recognition and dialect adaptation, ensuring inclusivity worldwide.
Yes. Most browser recorders save WebM. Upload it and you get the narration as text with timestamps.
Yes. A .webm file can hold audio alone, as browser voice recorders often save it, and it transcribes the same way.
You can start free, with no card, and transcribe short files every day. Pro adds unlimited transcriptions and files up to 10 hours or 5 GB each.
Yes. The editor shows every line with its timing. Correct names and terms, then download the finished file.
WebVTT is the caption format for HTML5 video. Vimeo, Wistia, JW Player, Video.js and most learning platforms accept .vtt files, and YouTube does too.
More than 100, from English, Spanish and Hindi to Arabic, Japanese and Swahili. Leave the language on auto-detect, or choose it for the best result on short files.
Files are transcribed many times faster than they play, so most are ready in a few minutes. Long recordings take a little longer, and you can close the page while they run.
Join thousands of users who trust Scriptivox for their transcription needs