How do you say hello welcome back in portuguese?

There are a few ways to say "hello, welcome back" in Portuguese, depending on the formality and context:

Formal:

* Olá, seja bem-vindo(a) de volta! (This is the most common and formal way to say it.)

* Bom dia/Boa tarde/Boa noite, seja bem-vindo(a) de volta! (This is even more formal, adding a greeting based on the time of day.)

Informal:

* Olá, seja bem-vindo(a) de volta! (This is also used informally.)

* E aí, voltou! (This is a more casual and friendly way to say it.)

* Bem-vindo(a) de volta! (This is a shorter and more informal way to say it.)

Note:

* Bem-vindo(a) means "welcome."

* De volta means "back."

* (a) is used for feminine and (o) for masculine.

You can choose the best option based on the person you are addressing and the situation.