Looking at some of the replies, I don’t think folks are getting what the original lister was requesting. I just encountered the same problem. The stamp that was sent to me by corporate was bigger than my page, and when you have to use this stamp multiple times a day it gets really old to click on the stamp once it is on the page and resize the image. What they are looking for is a stamp that is already the correct size.
I resolved this by going to
Menu
Create
Blank Page
Insert the stamp you want to use, size it to the size you want relative to the page. save this page to your desktop and name it something similar to the stamp you are currently using. Close this document in Adobe.
See All Tools (across the top)
Add a Stamp (scroll down), OPEN
Custom Stamps (left side menu)
Create
In the “FILE” - Browse - Look for the file you just saved to your desktop.
It should open a small representation in the window that shows your stamp in the size compared to a page of paper. If this is the correct sizing for you continue. and say OK
Category - Select the down arrow on the right side and select the category where you want to save this new resized stamp,
Name - What do you want to call this stamp - this is how it will appear on the menu to be selected.
check box ( down sample stamp to reduce file size)
OK
Open any document and try the new stamp. New stamp should be the correct size. If it is still too big, try the process again as listed above with a new name until you get the desired size.
Hope this helps. It worked for me. 😁