Passe Covid is a free mobile application that can be used to check the validity of a Digital Certificate issued by a Member State of the European Union, Iceland, Liechtenstein, Norway, or Switzerland. It is a tool that can be used by all EU citizens to check the validity of the certificates issued by the Member States.

The application is based on QR Code technology. It is a mobile tool that works as a web service. It is not a web application and it does not store data.

The QR Code is the unique identifier of the certificate. It is used to check the validity of the certificate. If the QR Code of the certificate is scanned, then the application will display the result of the check. It is a mobile tool that can be used by all EU citizens.