Subtitle Converter — SRT / VTT / ASS + Time Shifter

Convert subtitles between SubRip (.srt), WebVTT (.vtt) and ASS/SSA (.ass), and shift all timings forward or back to fix out-of-sync captions. Runs entirely in your browser — no uploads, no libraries, just your subtitle file.

Subtitle file (.srt, .vtt, .ass, .ssa) …or paste subtitle text

Converted subtitles

Positive shift moves captions later, negative moves them earlier (cues that end before 0:00 are dropped). ASS styling/positioning tags are stripped when converting away from ASS, and a clean standard header is written when converting to ASS.