OfflineSubs Keeps Subtitle-Making on Your Machine

Field notes

OfflineSubs accepts common video and audio formats, loads a roughly 75 MB speech model in the browser, and produces timed SRT or WebVTT files alongside plain text. Its editing surface includes character-per-line limits, cue-duration controls, short-cue merging, playback-linked navigation, and global timing shifts. The page estimates desktop processing at about 0.5–1× realtime and recommends splitting long recordings into shorter chunks. It states that later runs can continue offline once the model is cached.