This paper is concerned to show how a mobile phone equipped with Near Field Communication (NFC) can be used to construct a Single Sign-On authentication system (Celikkan & Gelis, 2014, August). When logging in to numerous online sites, customers no longer have to juggle a plethora of usernames and passwords to keep track of. As omnipresent computing devices, smartphones are utilised for a wide range of functions, from authentication to tracking to medical care to entertainment and epayment. Among NFC's many advantages is that it uses short-range communication, which enhances security while also making it simple to use. Our Chrome browser extension allows users to easily authenticate and manage their personal information from their mobile devices. Owing to browser security restrictions, JavaScript code (used in the Google Chrome extension) cannot access computer system resources when executing in a browser. As a result, the Java applet is used to run the software on the user's computer. With the help of the extension, NFC Reader may be accessed and used, and a connection between Java and JavaScript can be established. Using NFC, the user does not have to input any account information because it is automatically uploaded to the online login page. IndexTerms: NFC, Login, Mobile apps , website, RFID , Authentication, Sign-in