Formal:
* Jeg er glad for at se dig: This is the most literal translation, meaning "I am glad to see you".
* Det er dejligt at se dig: This translates to "It is nice to see you".
Informal:
* Det er dejligt at se dig igen: This means "It is nice to see you again".
* Det er rart at se dig: This translates to "It's good to see you".
* Godt at se dig: This is a more casual way to say "Good to see you".
You can also use the word "glæde" (joy) in various combinations to express happiness at seeing someone. For example:
* Det giver mig stor glæde at se dig: "It gives me great joy to see you".
The best option for you will depend on the specific situation and your relationship with the person you're talking to.