Repeated pasting of the same string

[Aidan Bell]

I visit a website that requires the same password to be typed in often, so I'm looking for an app that will allow me to use a keyboard shortcut or other method of pasting the same string quickly each time I need it. Security isn't an issue, it doesn't have to be safe in that respect, I just want to avoid having to type the same 12-digit password over and over. Basically I want to paste without having to copy first. I need the string to exist in a permanent memory from which I can always paste it when needed. Can anyone suggest anything? Many thanks.