100% Private & Local
Convert to WebVTT
SRT or ASS in — proper .vtt out, with a correct header and dot-millisecond timings, ready for any HTML5 player.
Select subtitle files
or drag them in — a whole folder works too · SRT, VTT, ASS, SSA, TXT
Cue settings (position, alignment) survive the trip when the source had them.
Files stay on this device — nothing is uploaded.