psd and jpeg formats

You have the wrong understanding.  A document resolution is a printer setting that set the Pixel size the image will be printed with. You need a lot of high quality pixels to print a large print with small high resolution pixels.  Displays can not change their Pixel size,  Displays display a fixed number of pixels the are all the same fixed size. This Can not be changed.   What is important  on the web is the number of pixel you have in the web images.  The document canvas size x Px wide y px height.  Web application like Browsers can scale image via HTML for viewing but you do want have large prints  high resolution print size image being transferred across the web then scaled down for viewing on a display, Its was wast of web bandwidth slows down response wast of sever disk resources etc.

Any DPI resolution setting is meaningless when it come to any display they can not change their resolution and they display a fixed number of pixels.  They display one size image with there fixed size pixels.  Like your TV. Small TV have smaller pixels than larger TV. smaller TV have higher resolution image then larger TV, Both display the same number of pixels.

You need to resample your images down in size for the web.  You want fewer pixels in you web size images, Resolution means nothing. Two files You Print size file and your web size file.