Starting from 1 May 2025, all non-Thai nationals entering Thailand, by air, land or sea, must fill out the "Thailand Digital Arrival Card (TDAC)" at https://tdac.immigration.go.th/ .

REPLACING the paper arrival card (TM6), TDAC is free of charge, and is available for submission within 72 hours (3 days) prior to the arrival in Thailand.

For more information, please visit the following websites:

TDAC Online Registration Website
https://tdac.immigration.go.th/

TDAC Introduction Video 

https://www.youtube.com/watch?v=QSEoVloM5A0&t=1s