The cover pic / banner image minimum size/scale is 1040 x 520, with a max file size 10Mb.
If you upload bigger than this, One Page Link allows you to crop your image.

If you need to resize your image, the following service may be helpful for you.

note - we have no affiliation with this service.

GO TO: www.photoresizer.com

Import your image
Keep the ’Stretchy’ Tab Selected.

Ensure the padlock icon is ‘locked’, this will maintain proportions of your image.

Set your Width to 1040 and press enter.

You will see the dimensions adjust.

If a height over 520 was not reached, then increase the height the 520 and press enter.

hit APPLY

your image is now ready.
right click and save it, then upload it to your banner section!