How do you say in portuguese Just wanted to hello?

There isn't a direct translation for "Just wanted to say hello" in Portuguese that captures the same casual and informal tone. Here are a few options, with varying levels of formality:

Informal:

* Só queria dizer oi! (Most literal and common)

* Queria só dar um oi! (Slightly more emphatic)

* Oi, só queria te dar um oi! (Adding emphasis with "oi" at the beginning)

* Quero te dar um oi! (More direct, implies you just wanted to say hello)

Formal:

* Gostaria de cumprimentá-lo/la. (Formal, appropriate for strangers or someone you respect)

* Queria apenas dar um breve cumprimento. (More formal, emphasizes the briefness)

The best choice will depend on the context and your relationship with the person you're talking to.