純本機私密執行的 Subtitle Timing Synchronizer & Video Sync

Synchronize delayed, early, or drifting subtitle files (SRT, VTT, ASS) with millisecond precision, 2-point linear drift stretching, framerate conversion, and live video overlay preview 100% locally. 100% 瀏覽器本機處理，無需註冊帳號，零伺服器上傳。