The phrase “I’ll keep that in mind” means that the speaker intends to remember or consider the information, suggestion, or advice that has just been communicated. It implies a willingness to take the information into account for future reference or decision-making. The tone can vary depending on the context; it may express genuine appreciation for the input, or it could be used more casually or even dismissively, depending on the situation. Overall, it conveys the idea that the speaker acknowledges what has been said and will think about it later.