Change most types of subtitles to webvtt.
Web Video Text Tracks Format (WebVTT) is a modern subtitle format used for online video subtitles. This online tool converts many text-based subtitle formats to vtt.
WebVTT subtitles are similar to Srt subtitles in many ways. Both formats are plain text, this means you can open them with Notepad and make changes. WebVTT has better support for styling subtitle cues than Srt does, and supports advanced features like karaoke style captions. WebVTT also has features that are especially convenient when creating subtitles, such as comments, referencing cues, and CSS support for styling text.