In 2026, whether you need to return your hotel key depends on the technology used, but it is good practice to return physical plastic cards so the hotel can reuse them. Standard RFID plastic cards are inexpensive and do not contain personal data, so if you forget to return one, the hotel usually won't charge you. However, many eco-conscious hotels now use wooden or biodegradable keys, which they strongly prefer to have back for recycling. If you are staying at a traditional boutique hotel with a physical metal key, you must return it, as these are expensive to replace and pose a security risk if lost. For the growing number of hotels using Digital Keys (Mobile Keys) via your smartphone, there is nothing to return; the digital token simply expires at check-out time. If you want a souvenir, most hotels are happy to let you keep a plastic card if you ask, but checking out via the app or front desk and dropping the card in the "Key Drop" box remains the standard 2026 etiquette.