一次拖入几十上百个 SRT、VTT，统一转成目标格式，打成一个 ZIP 拿走。序号重排、时间戳按目标格式规范化；认不出的文件单独标出来，绝不混进包里装作成功。全程在浏览器里完成，文件不上传。
Drag in hundreds of subtitle files, convert them all, take away one ZIP. Runs fully in your browser.
SRT to VTT and back in bulk; sequence numbers re-ordered and timestamps normalized per target format. Files that can't be parsed are flagged and left out of the ZIP. Original filenames kept with a new extension; collisions get a suffix.
Editors and subtitlers converting whole series folders, and site owners feeding players a single format.