NEW!!! "The Thai ETA will be mandatory for visitors who enjoy visa-free travel to Thailand: an extensive list of almost 100 ‘visa waiver’ countries including Australia, New Zealand, the United Kingdom, Canada and the USA, Singapore, China and Hong Kong, along with most European nations."
TLDR : Answer Summary
The Thai government has announced that a new electronic travel authorization (ETA) will soon be mandatory for travelers from nearly 100 countries that currently enjoy visa-free travel to Thailand. This includes nations like Australia, New Zealand, the United Kingdom, Canada, the USA, Singapore, China, Hong Kong, and most European countries. Some commenters express concern about the timing and implementation of this system, particularly regarding security and potential impacts on crime rates.
THAILAND ELECTRONIC TRAVEL AUTHORIZATION (ETA)