Yes, you can use salted butter for making brownies. In fact, using salted butter can add a nice flavor contrast to the sweetness of the brownies. The salt content in the butter can enhance the overall taste of the brownies and create a delicious balance of flavors. However, it's important to keep in mind that using salted butter may slightly alter the overall saltiness of the brownies. If the recipe already includes salt or if you're concerned about the saltiness level, you can reduce or omit the additional salt in the recipe to compensate.