The Royal Thai Government has launched “Online Application for Visa on Arrival” service to facilitate passport holders that are eligible to apply for visas at the immigration checkpoints on arrival for the purpose of tourism.
“Online Application for Visa on Arrival” service is now available only for passengers arriving Thailand via Suvarnabhumi Airport. The online application may be made prior to arrival at http://www.immigration.go.th > Online Application for Visa on Arrival. (Direct link: https://extranet.immigration.go.th/voaonline/voaonline/VoaonlineAction.do)
For passengers arriving via other immigration checkpoints, hard copies of application form will be available at the checkpoints and is available for download here http://www.immigration.go.th/nov2004/download/form_voa.pdf