SubSync Player
Browser tool to sync and adjust subtitle timing against video
Free

About
SubSync Player is a free browser tool that syncs and adjusts subtitle timing against video. Load a video and subtitle file, shift timing interactively, and export the corrected track with no account required. Built by Jamack for caption editors and translators.
Features
- Interactive subtitle timing shift
- Load video + subtitle in browser
- Export corrected subtitle track
- No account required