Subtitle Spider-man.homecoming.2017.1080p.blura... Online

Since you are using a source, make sure the subtitle filename includes "BluRay" or "BRRip." If you download a subtitle meant for a "Digital" or "WEB-DL" source, the timing might be slightly off due to different frame rates or studio logos at the beginning.

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It seems you are looking for subtitle files specifically for the Blu-ray release. Since you are using a source, make sure

: One of the largest databases available. It usually has dozens of versions for the BluRay release to ensure the timing (sync) is perfect. Since you are using a source