What documents do I need to extend my 30-day visa on arrival in Bangkok?

To extend your 30-day visa in Bangkok, you can only do so if you entered on a visa-exempt stamp, not a visa on arrival. For eligible travelers from certain countries, you can apply for a 30-day extension at IT Square Laksi Plaza. Required documents include a copy of passport pages, one recent photo, completed application paperwork (typically four pages), and a fee of 1,900 baht.