The video editor in YouTube Studio desktop lets you trim & cut the beginning, middle, or end of your videos. You don't have to re-upload a video to trim it, and the video's URL, view count, and comments will stay the same. To use the video editor, go to YouTube Studio then Content. Choose the video you’d like to make changes to, then go to “Editor”.

Check out this Help Center article for more info: https://support.google.com/youtube/answer/9057455

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