How do I apply for a multi re-entry permit in Thailand?

To apply for a multi re-entry permit in Thailand, you can visit your local Immigration office, where you may be able to wait for the processing. In Krabi, for example, applicants can complete the process on-site. Alternatively, you can obtain the permit at the airport, but this option is only available if you are flying out internationally on the same day; otherwise, you must go to the Immigration office.