What happens if you stay in Thailand without a visa?
If you stay for more than 30 days without legally extending your right to stay, you will be on overstay. Penalties for overstaying include a 500 baht fine for every day of overstay, up to a maximum of 20,000 baht.
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If entering Thailand by land or sea, eligible travelers holding normal passports will be granted visa-free travel to Thailand twice per calendar year. There is no limitation when entering by air.
In the past people could do infinite border runs (leaving by a land border and re-entering, getting a new visa exemption in the process) however as of January 1, 2018 you can only do 2 border runs per calendar year (any more and you will likely be denied).
In general, the period of stay for a tourist visa is not exceeding 60 days and for a non-immigrant visa is not exceeding 90 days from the arrival date. If you stay in Thailand more than the period which granted, you will be fined 500 Baht for each day of your overstay.
If someone is not eligible for visa exemption, they may apply for a 15-day Visa on Arrival. If you are entering Thailand for tourism, leisure, or medical purposes, are not intending to visit other Asian countries, and know that 30 days will not be long enough, then you can apply for a 60-day Single Entry Tourist Visa.