Most of the bloggers who use “Blogger” as their blogging platform using CSS (Cascade Style Sheet) to set height, width etc and have no idea that they can set their image height, width, border, burl, crop etc only changing blogger image permalink, nothing more nothing less. You don't believe me let's checkout how we can do this.
Default Image First check URL Structure of Blogger Image.
If you upload image to blogger it by default it automatically adds1600 to its permalink,
it look like this: https://lh3.googleusercontent.com/-aRxiz...Images.png
Crop the image Replace s1600 to s600-cin image url, you will get image as square means it height and width exactly 600px.
You can also use s600-p to crop the image https://lh3.googleusercontent.com/-aRxiz...Images.png
Add Border to the image Replace s1600 to s1600-b10 in image url, you will get 10px black color border on the image.
I have tried maximum to b50 but you can try more. https://lh3.googleusercontent.com/-aRxiz...Images.png