VTT (Web Video Text Tracks) is the standard subtitle format for HTML5 video. It provides advanced features such as styling, positioning, and metadata support.

Format

• The file must begin with the WEBVTT header.
• Subtitle blocks, known as cues, are separated by blank lines.
• Each cue consists of:
  1. Cue identifier (Optional): A string used to identify the cue (e.g., intro).
  2. Timecode: The start and end times, separated by -->. Standard formats are mm:ss.mss or hh:mm:ss.mss. LingoHub supports both the period . and the comma , as decimal separators for milliseconds.
  3. Cue settings: Optional settings (e.g., align:start size:50%) can follow the timecode.
  4. Payload: The subtitle text content.
• LingoHub parses NOTE blocks as comments.
• LingoHub preserves STYLE blocks during import and export.
• The timecode line, including any settings, is used as the segment key (e.g., 00:00:00.000 --> 00:00:02.500 align:start).

Example

Additional example files are available on GitHub.

WEBVTT

NOTE
This is a comment block in a VTT file.

intro_slide
00:00:00.000 --> 00:00:10.700
Welcome to the presentation.

main_content
00:00:10.700 --> 00:00:47.600
This is the main payload of the subtitle.

Used by

• HTML5 <track> element.
• Modern web video players such as Video.js and Plyr.
• Major streaming platforms.

References

• W3C WebVTT specification.
• MDN Web Docs: WebVTT API.
• LingoHub example resource files on GitHub.