In 2026, where you leave your hotel key depends on the hotel's technology, but the three most common high-value options are: leaving it in the room, dropping it in a "Key Drop" box, or taking it to the front desk. Most major chains like Hilton or Marriott now prefer that you use their mobile app for "Digital Check-out," after which you can simply leave your plastic key cards on the desk in your room or throw them in a "Express Check-out" box in the lobby. If you are staying at a smaller boutique hotel or an international B&B, you may still be required to hand the physical key back to the front desk clerk to confirm the final settlement of your bill. A high-value peer tip: if you use a "Digital Key" on your smartphone, you don't have to "leave" anything at all—your access simply expires at the check-out time. However, for plastic keys, always look for the "Key Return" bin to help the hotel recycle the cards, and always ensure you've officially "checked out" via the TV, app, or phone to avoid any unexpected high-cost late fees.