Resizing images automatically with Browse button

Hi,

   I have created a Blog page on our site and am setting up a page for anyone in the company to update the blog with some text and an image. What I would like to do is resize the image automatically to what I want it to be with the pixel size and file size. I found a web site that does this, but I would like to have this code on my own web site. Here it is:

http://www.resizemypicture.com/

    Does anyone know how to set up code so when the Browse button is clicked that it will resize the image automatically to what I want it to be with the pixel size and file size? I’m thinking having it be 120 pixels wide by 86 pixels high at 4K file size. It would be like Facebook when you upload a large file image, but it re-sizes it automatically. Is there some code out there I could use? Or would we have to purchase that? Is it hard to set up? Thanks.

Andy