Disclosed are systems and methods for secure online authentication. An exemplary method comprises: determining, via a processor of a computing device, a connection being established between a browser application installed on a computer system and a protected website; obtaining information relating to the protected website in response to obtaining a request for authentication from the protected website; establishing a protected data transmission channel with the protected website to receive at least one certificate of the protected website; performing authentication and transmitting authentication data to the protected website; and in response to an indication of a successful authentication from the protected website, transmitting identification information to the browser application for enabling access to the protected website.