Using a credit card online is safer than using a debit card because credit cards offer better fraud protection. In case of unauthorized transactions, credit card companies usually have zero liability policies, meaning the cardholder is not responsible for any fraudulent charges. On the other hand, debit cards may have limited liability policies, and if unauthorized transactions occur, the cardholder may be liable for a certain amount of money. Furthermore, credit cards also provide an additional layer of security through virtual card numbers or two-factor authentication, making them a more secure option for online transactions.