In 2026, the advice to "destroy" hotel key cards because they contain personal data or credit card info is largely considered a travel myth. Modern RFID and magnetic stripe key cards typically only store an encrypted room number and an expiration date/time. They do not contain your name, address, or financial details. However, while your data is safe, security researchers in 2024–2026 discovered vulnerabilities in specific older lock systems (like "Unsaflok") that could allow hackers to clone cards to gain unauthorized room access. Because of this, it is better to return the card to the front desk so the hotel can properly de-provision it and recycle the plastic, which is better for the environment. If you are still worried, simply cutting the card through the chip or magnetic stripe is sufficient. There is no need for extreme measures like burning or shredding; once you check out, the code on the card is electronically "killed" by the hotel's management system anyway.