Image high quality when in bigger format, but pixalated when shrunk...?

[grave yacht]

Hi, I'm new to image editing, and need a little help.
I have 2 images, one is 7200 x 2402 and the other is 5000 x 15000. They're very high quality, and there's no pixels when I zoom in, however, when I shirnk them down to 500x1500 so I can print them, but when I do that they become all blurry and pixalated, can anyone help with that? Or atleast make them the format for me? I would really appriciate it.

[lilac badge]

Hi, at what size are you printing them? On which printer? Why do you scale them down? Reducing the size might eliminate details thus softening an image?

[pearl raven]

To get a crisp-looking print, you should have 300 pixels packed into each inch. (300dpi). 500 x 1500 might look fine on a computer screen, but it’s not enough pixel information for a sharp printing.

Instead, use the original sizes but choose “scale to fit” when printing