Convert subtitles between SRT and VTT, nudge the timing when they're out of sync, or stretch them to fix the slow drift where they start fine and drift further off as the video goes on.
Choose a subtitle file
Drop an .srt or .vtt fileSRT · VTT
Adjust
If the first line is right but later lines are increasingly off, tell it where a late line should land. Leave blank if you only need a simple shift.