How can optimization be applied in images?

[janesamuel]

Hello guys,
I wanted some help, and I am facing some problem in image optimization. I was compressing an image. But the web site with which I was compressing the image changed the dimensions of my image,
so please tell me some ways how to fix it.
Thank you...

Link removed...

[highend]

And what can XY do to "restore" the original size of your image? Don't compress it via that site (for which I have the link removed)?