Put your link in, put your picture in the middle, point any phone at it and it goes straight there. Free. No sign up. Your picture never leaves your phone.
Open full screen ↗The three big squares are how phones find the code. Any dark color works.
That color is too light against the background. Phones might not read it. Go darker.
Test it: open your camera and point it at the screen. Printing: stays sharp up to about 5 inches across. Don't go smaller than about 1 inch, or phones struggle.
A free tool from NOCIV.CO. Nothing tracked. Your picture never leaves your phone.