Formal:
* Prazer em conhecê-lo(a). (Pleasure to meet you.) - This is the most common and formal way to say it.
* É um prazer conhecê-lo(a). (It's a pleasure to meet you.) - This is another formal option, slightly less common than the first.
Informal:
* Prazer em te conhecer. (Nice to meet you.) - This is the most common informal way to say it.
* É um prazer te conhecer. (It's a pleasure to meet you.) - This is another informal option, less common than the first.
You can also use these phrases depending on the gender of the person you are speaking to:
* Prazer em conhecê-lo. (Nice to meet you, male)
* Prazer em conhecê-la. (Nice to meet you, female)
For the informal options:
* Prazer em te conhecer. (Nice to meet you, male or female)
Remember to adjust your language based on the situation and your relationship with the person you are speaking to.