i.ytimg.com/vi/a5xukN_ZG6w/maxresdefault.jpg

How to get HQ thumbnails? - Stack Overflow

All about Thumbnail Images as ytimg maxresdefault especially in Search

] `maxresdefault` doesn't exist sometimes · Issue #340 · yt-dlp/yt-dlp · GitHub

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maxresdefault thumbnails - Stack Overflow

get-thumbnail option gives url to broken images. · Issue #402 · yt-dlp/yt-dlp · GitHub

How to get HQ thumbnails? - Stack Overflow

i.ytimg.com/vi/I4j4OGl_XHQ/maxresdefault.jpg