How to find 4K or HD videos only on YouTube?

If you want to see HD (High-definition) videos only in YouTube search results, then add keyword hd to the search query.

Example: avatar, hd

Query to find HD videos on Youtube

To get only 4K Ultra High Definition videos in search results, add 4K to the search query.

Example: movie, 4K

search query to get 4K videos only on YouTube