What is the TM7 form and how can I obtain one for my visa extension in Thailand?

The TM7 form is the application required for a 30-day extension of stay in Thailand. It can be acquired at the immigration office, where you can also find it at the information desk. Alternatively, it may also be found online. When applying for the extension, you will need to present several documents including a copy of your last entry stamp, the main page of your passport, the TM30 form from your residence, a passport-sized photo, and there is generally a fee of around 1,900 THB. It's advisable to arrive early and ensure you have all necessary documents to facilitate the application process.