Most birthday greetings fail the same way: they say something nice that could have been said to anybody. Wishing you happiness, health and love is three abstract nouns and no information, which is why it reads like a card somebody bought in a hurry.
A greeting works when it observes something before it wishes something. The observation does not have to be dramatic - you are not always good at noticing how many people are glad you exist is an ordinary sentence, and it lands, because the wish that follows it has somewhere to stand.
The fifty below are grouped by tone and relationship, and each section ends with a ready-to-use prompt that turns any of them into a message only you could send. If you would rather write from scratch, our birthday prompts help you find the detail that makes a message personal, and there are shorter finished messages in our happy birthday wishes collection. Whichever you choose, adding one real detail — a name, a place, a shared joke — is what makes it yours.