Yes, in most modern hotels in 2026, you can leave your room key inside the room when checking out, provided the hotel supports express or digital checkout. Many travelers find it convenient to leave the key on the desk or nightstand and simply walk out. However, it is always best practice to notify the front desk via the hotel's mobile app or a quick phone call that you have vacated the room so they can alert housekeeping. If the hotel is more traditional and requires a manual checkout for billing verification, they will prefer you to return the key to the front desk or a dedicated drop-box in the lobby. Leaving the key in the room is generally safe since key cards are deactivated upon checkout and do not contain personal data, but always check the specific "Checkout Instructions" provided in your room or on your booking confirmation.