Tanti_auguri_di_buon_compleanno -

: Literally "many wishes." This is the most versatile and common way to say happy birthday.

: The standard "Happy Birthday." It is widely used but can sometimes feel a bit "textbook". Auguri di cuore! : "Heartfelt wishes". tanti_auguri_di_buon_compleanno

Depending on the level of formality and your relationship with the person, you can use these expressions: : Literally "many wishes