As of 17 February 2022 Switzerland has disposed all COVID-related restrictions to enter the country. For the time being certificates for vaccination or negative tests as well as entry forms are no longer required.
You might find the "Travelcheck" useful, which allows you to check whether and under what conditions you can enter Switzerland.
Please find further detailed information on this webpage of the Swiss Federal Office of Public Health FOPH.
Please note:
Some safety measures for the user operation (in particular, wearing of face masks) are still in place!