When you adapt an image to view on a display, you change the total amount of pixels of the image.
Read below how to resize your images in the most popular photo editors:
There are many ways to reduce images but it is always hard to obtain a large picture from a small one. If you want to increase your image using the standard resize command of a photo editor, you will notice that the resulting photo is blurred and pixelated. To solve this problem you can use special tools: