YouTube remembers how much of a video you have watched, so you can instantly resume playback, but as a bookmarking feature, it is not very sophisticated. A Much better option is the new Chrome extension YouTube Bookmarker, which lets you easily bookmark your favourite parts of videos for future enjoyment. To use the add-on just click the Bookmarker button below the video to open the panel on the right. Click set to bookmark the start point of the desired section, then set the stop point and then click Save. You can also enter a title for the bookmark, and you can create multiple bookmarks for the same video. All the bookmarks you save are grouped under the title of the relevant video in YouTube Bookmarkers pop-up toolbar panel.
A clean bookmarker placed right next to your YouTube video, so that you can easily bookmark your favorite parts of the video. You can use these bookmarks to quickly go through those clips without watching the whole video again. To open the bookmarker, you simply have to click the “Bookmarker” button placed alongside the “Add to” and “Share” button. The bookmarks are synced with your Google Chrome account, so you can view your bookmarks when you come back to a previously watched video.