Can I get a 60-day tourist visa upon arrival in Thailand, and do I need to complete an online application?

There is no such thing as a 60 days tourist visa on arrival!

What passport are you using?

Hello Andrew, you have a UK passport - so that means you need to do nothing before arriving in Thailand. At the airport they give you a stamp that says you can stay in TH for 60 days. (That stamp has been called a visa, or a visa exemption --- all that language is BS to me. The point is that you get to stay in TH 60 days. No forms to fill out, no money to pay.) Take care.

All this has been answered so many times.

Just arrived got 60days with a smile no other info needed

You didn't provide the only information that matters, which is your passport country. That determines what you can qualify for.

There is no such thing as a 60 day tourist visa on arrival. There is a tourist visa that you have to apply for before you travel from a Thai embassy. There is a visa on arrival that is applied for and paid for at the airport and only available to certain countries and is only for 15 days. There is visa exempt which is probably what you are asking about and it's not any visa at all. But it's only available if you are from certain countries, and you didn't provide that information.

Andrew you can get a 60 day visa exempt stamp when you enter thailand with a uk passport. This is not a visa but a visa exemption. This visa exemption can be extended by 30 days at the local immigration office when you are in thailand at a cost of 1900 baht.