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Subtitle Edit
Fix subtitles that appear too early or too late
Desktop appFree subtitle editor · desktop setup
Open Subtitle Edit Why this one
Keep an existing subtitle file and correct its timing instead of generating everything again. Useful when the words are right but the captions drift away from the speech.
Try this first
Open a copy of your SRT file with its video. Adjust a short section, check the beginning, middle and end in playback, then save a new subtitle file.