SubtitleMedic is a set of free tools for fixing subtitle files: shift timing, change frame rate, sync against another file, edit line by line, merge two languages, convert between SRT, VTT, ASS, SBV and SUB, repair broken encoding, and save subtitle tracks from MKV, MP4 and WebM videos. Everything runs in your browser tab, so files are never uploaded. No sign-up, and it keeps working offline once the page has loaded.
