The surest way to fix out-of-sync subtitles: tell the tool when two lines, one near the start and one near the end, are really spoken. Every other line is moved and stretched to match, which fixes both a fixed delay and a growing drift.
Load your subtitle file. The first and the last line are selected for you.
Play the video, note when each of these two lines is really spoken and type those times.
Download the synced file.
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Two lines far apart, ideally one near the start and one near the end, that are easy to recognise. The further apart, the more precise the result.
Hours, minutes and seconds such as 01:23:45,600 or 1:23:45.6, or minutes and seconds such as 23:45.
When the video has a different cut, with scenes added or removed. Then split the file where the cut is, sync each part and merge them again.