Is it you're welcome or your welcome?

The correct spelling is, "You're welcome." The Word "your" is a possessive pronoun; the Word "you're" is a contraction for "you are". Whenever you have a question about possessives versus contractions, expand the contraction and see if it makes sense. For example, wrong: "May I borrow you're keys?" would expand to "May I borrow you are keys?" which makes no sense. Example, right: "You're welcome." expands to "You are welcome." which makes total sense. This same common sense rule is especially helpful with "there", "their", and "they're". "There" denotes a location. "Their" denotes another possessive. "They're" is a contraction for "They are". For example, wrong: "There going to the beach." Example, right: "They're going to the beach." expands to "They are going to the beach."