The High-Resolution maxresdefault URL Formula
YouTube generates high-definition thumbnail assets for every video. Copy the 11-character video ID from the YouTube URL and insert it into https://img.youtube.com/vi/VIDEO_ID/maxresdefault.jpg.
Saving Thumbnails in High Quality
Open the constructed image link in any browser tab, right-click the image, and choose “Save Image As” to download the clean 1280x720 HD graphic without watermarks or browser overlays.
Related Questions
如何提取并下载高清YouTube视频封面原图？
利用视频ID拼接到官方maxresdefault.jpg高清封面图片地址，即可免插件保存1080p原图。
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