How to add an full screen img?

Answer 1

There are many ways... or not really... depending on what your are exactly expected ( and meaning by "full scren" ) ^^

If "full screen" is for "full viewport", we need to know:
- A full screen alone image?
- An overlay full screen one?
- How handle ratio difference between viewport and picture? ( covering with cropping or not, deform/adapt to viewport ratio )

If you want real "full screen", only the user can set viewport at full screen, or you need to handle some third party technology as Flash...

Answer 2

you can set it as a background-image with CSS

Answer 3

I agree with Meher, best way is with CSS make: background-size: cover;

Answer 4

yes we can increase the height width of an image according to the screen