Formal:
* خوش آمدید (Khosh āmadid) - This is the most common and formal way to say "welcome" in Farsi. It literally means "you are welcome".
Informal:
* خوش اومدید (Khosh oomadid) - This is a more casual and friendly way to say "welcome" in Farsi. It is often used between friends and family.
* به سلامتی (Be salāmati) - This literally means "to your health" and is a common way to say "welcome" to someone who has arrived at a gathering or party.
* به به (Be be) - This is a very informal and casual way to say "welcome" and is often used among friends and family. It literally means "Oh, yes!".
Other options:
* خوش آمدید به ایران (Khosh āmadid be Irān) - This means "Welcome to Iran" and is used to welcome someone to the country.
* خوش آمدید به خانه (Khosh āmadid be khāneh) - This means "Welcome to home" and is used to welcome someone to your home.
The best way to choose the right phrase depends on the context and your relationship with the person you are welcoming.