It seems some are forgetting their manners!
The resolution of each JPEG is 3998 x 2500 so yes it is in high resolution (4K in fact because it is more than 3840 x 2160).
These are ideal as a backdrop for your own artwork (Think dropping a PNG with transparency over those!).
As for the complainers, you are getting these for nada, no money needed to get them so quit your freaking bitching, if you don’t like it, move on.
Thank you Sharewareonsale and Eldamar.