When a subtitle is still on screen as the next one starts, players stack them or skip lines, and YouTube or video editors may refuse the file. The tool shortens each line so it ends before the next one, and joins lines that start at the same moment.
Load your subtitle file: the number of overlaps is shown.
Set the gap to keep between two lines (for example 80 ms, about 2 frames).
Download the fixed file.
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Usually after merging two files, after automatic subtitles, or after editing times by hand.
0 is fine for most players. Broadcast and streaming specifications often ask for at least 2 frames, about 80 ms.
No. Lines that start at exactly the same time are joined into one; all others only get an earlier end time.