First hit on Google: thaievisa.go.th

Check the URL for "go.th" to verify it's an official government website. Avoid anything with .com, .net, .org etc. Digital arrival card is here: tdac.immigration.go.th/arrival-card/#/home

The official e-Visa website for Thailand is:

https://thaievisa.go.th

Check the URL for "go.th" to verify it's an official government website. Avoid anything with .com, .net, .org etc.