VTT Generator

WebVTT is the caption format of the open web: it's what the HTML5 <track> element expects, what modern web video players consume natively, and what most embedded-video platforms ask for when you add captions. If your video lives on a website — a course platform, a product page, a help center — VTT is the file you need.

Castmagic generates it straight from the media. Upload audio or video, transcription runs with word-level timing, and the exported VTT carries cues that match the speech exactly — readable lengths, accurate boundaries, standard syntax. Edit the transcript first and the captions inherit every fix.

Where VTT files go to work

Self-hosted HTML5 video with a <track> tag. Course videos on learning platforms. Product demos and onboarding videos in web apps. Help-center walkthroughs. Video players like Video.js, Plyr, and JW Player. Anywhere video is embedded in a page, VTT is how the captions ride along.

Captions are an accessibility requirement, not a nice-to-have

Accessibility standards for web content expect spoken material to have text alternatives, and captions are the baseline for video. A generated VTT gets embedded video from non-compliant to captioned in minutes — with accuracy you've verified in the editor, not auto-captions you can't touch.

VTT details done right

WebVTT times cues with a dot for milliseconds (HH:MM:SS.mmm) where SRT uses a comma — small differences like this are why hand-converting between formats goes wrong. Castmagic exports clean, spec-correct VTT, and the SRT version is in the same menu if a different tool in your chain wants SubRip instead.

The transcript does double duty

The same transcript behind the VTT exports as text, PDF, Word, and CSV — and powers AI-generated summaries and descriptions for the page the video lives on. Caption the video and write its supporting copy from one upload.