Convert VTT to PDF

The WEBVTT header, cue identifiers, NOTE and STYLE blocks and positioning settings are all dropped, because none of them means anything on a page. Cue text, line breaks and timings survive.

Yes. A font covering Chinese, Japanese and Korean is embedded in the PDF, so those subtitles render rather than coming out blank.

Then you want a subtitle file, not a document — the VTT to SRT tool converts one with the timings untouched, and your original .vtt already works in any browser.

One timestamped line per cue, in order, flowing across as many pages as the captions need — a clean, readable document rather than a screenshot of a player. The text stays selectable and searchable, so a reviewer can find a specific line with Ctrl-F. Cue identifiers, positioning and styling that only a video player would use are left out, since none of it belongs in a document meant to be read.

WebVTT is a delivery format a browser reads; it is not something you hand to a person for review. A PDF renders identically everywhere, cannot be casually edited, and is the shape captions need to be in for sign-off, archiving or attaching to a delivery note. Keep the VTT for the video player and send the PDF to whoever has to read or approve the captions.