Originally Posted by
tng11
Of course, the nasty surprise here is that some places charge extra for using foreign cards, while not charging extra for Danish debit cards. This happens frequently at the discount supermarkets (1.8-2.8%). What shocked me was how many high-end restaurants (e.g. 2 Michelin starred) charge such fees as well (Geranium, Studio and AOC all asked for a foreign card fee.)

I noticed the same. Most stores do not make it clear what you will be charged until you have put the card into the chip and PIN device. There tend to be different fees for domestic Visa/MasterCard than foreign cards. Dankort always seems to be free to use.
Interestingly none of the fast food chains appear to have a surcharge.