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About this tool
Convert YouTube SBV caption exports into standard SubRip .srt files, with speaker markers, renumbering and timing offset.
The SBV to SRT Converter rewrites a YouTube SBV caption export as a SubRip (.srt) file. SBV has no cue numbers, writes times as H:MM:SS.mmm separated by a comma, and marks a change of speaker with a leading ">>"; SubRip numbers every cue from 1, zero-pads the hour to two digits, uses a comma for milliseconds and separates the two times with " --> ". This tool applies all of those changes in one pass, can shift the whole file by a millisecond offset, and runs entirely in your browser.
Open SBV To SRT Converter on AltFTool — it loads instantly in your browser.
Paste or upload your source content.
Choose the target format or conversion mode.
Copy or download the converted result.
Parses single-digit hours, comma-separated times and short millisecond fields the way SBV actually writes them.
Counts overlapping cues, which YouTube's automatic captions produce and many desktop players render badly.
Parsing and conversion are JavaScript running locally; the caption file is never uploaded.
SBV is the SubViewer-derived caption format YouTube Studio offers as a download alongside SRT and VTT. Each cue is a timing line in the form 0:00:01.000,0:00:04.000 followed by one or more text lines and a blank line — there is no header and no cue numbering.
Any plain-text editor opens it, since SBV is unformatted UTF-8 text. Video editors and most players do not read it, which is why converting to SubRip or WebVTT is usually the first step after downloading captions from YouTube.
A double angle bracket marks a change of speaker, and >>> traditionally marks a change of topic or story — a convention carried over from broadcast closed captioning. SubRip has no formal equivalent, so you can either keep the markers as plain text or strip them here.
YouTube's automatic captions often start the next cue before the previous one ends, so words scroll rather than switch. SubRip players usually show only one cue at a time, so overlaps can make lines flicker or disappear — this tool counts them so you know to tidy the timings in a subtitle editor.
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