Is 90-Day Reporting in Chiang Mai Only Done Online or by Mail?

In Chiang Mai, you can report your 90-day stay either online or by mail, as well as in person at the local Immigration Office. You can submit your report between 15 days prior to the due date and 7 days after the due date using the online method, computer, or mobile app. Alternatively, you can use traditional mail starting from 15 days before your due date.