Can I apply for a visa extension upon arrival in Thailand if I have a 30-day visa exempt entry?

Yes, you can apply for a visa extension for an additional 30 days after your initial 30-day visa exempt entry. To do this, you need to visit your local Thai immigration office. If you're in Bangkok, go to IT Square in Laksi where the immigration office is located on the 3rd floor. Bring your passport and necessary documents, and be prepared to pay a fee of 1900 Thai baht for the extension. Your eligibility for the visa exempt entry can depend on your nationality, so it's important to check if your passport qualifies.