How long can I stay in Thailand after my Non-B visa ends and can I switch to a tourist visa without leaving?

The ability to stay in Thailand after your Non-B visa and work permit end depends on the type of visa you have. If you possess an actual visa (sticker or e-visa), it cannot be canceled; however, if it is an extension based on your work permit, that must be canceled upon termination of your job. Typically, you cannot apply for a tourist visa while remaining in Thailand; you must leave the country first. There may be exceptions related to Covid extensions, but be aware that this is temporary and regulations can change.