How do you write have a great night in french?

Here are a few ways to say "have a great night" in French, depending on the context and level of formality:

Formal:

* Passez une bonne soirée! (This is the most common and polite way to say it.)

Informal:

* Bonne soirée! (This is a shorter, more casual version.)

* Profite bien de ta soirée! (This means "Enjoy your evening!")

* Passe une bonne nuit! (This is more literal, and would be used if you're saying goodbye for the night.)

You can also add a bit of extra personalization depending on who you're speaking to:

* Amuse-toi bien! (Have fun!)

* J'espère que tu vas bien t'amuser! (I hope you have a good time!)

The best way to choose the right phrase is to consider the person you're speaking to and the situation.