Change image upload size

Is there a way to allow someone to upload their image, can be any size, but for this example lets say its 2mb, and once its uploaded, it will be submitted as a lesser size. 

Basically in order for my system to work, the image dimensions have to be smaller than 300px in with, so Im thinking that in order to achieve this, if the image is converted to a smaller file size, so will the dimensions. 

Thanks

Unfortunately, our upload tool retains the size and the dimension of the files uploaded to your form. It is not changed in any way.

My suggestion would be to add a limit on the file size to be uploaded on your form. Limit the maximum file size to e.g. 1MB (which is the default limit) so files larger than this will trigger the validation and would display an error message.