3 days before
Submit no earlier than three days before arrival, arrival day included.

Arrival card step by step. Passport, flight and hotel, 3-day window, PDF with QR. Not a visa.
Fill it in nowSubmit no earlier than three days before arrival, arrival day included.
Save the confirmation and keep it ready for immigration.
The Thai portal stays free. Our optional help costs €19.99.
TDAC does not replace a visa. Visa rules stay separate.
You may submit the TDAC at earliest three days before planned arrival, counting the arrival day. Submit earlier and you will need to file again. If the flight changes, check the data and resubmit when needed.
After a successful submission you get a confirmation with QR. Immigration may scan it. Without a readable copy you can wait longer in line.
The Thai authority portal is free. getTDAC checks entries, helps with submission and emails PDF/QR if you book the service. You can always use the official site alone.
The Digital Arrival Card is an entry form. Whether you need a visa depends on passport and purpose of stay and runs separately. Searching only for a Vietnam-style e-visa? Wrong product. Filling the arrival card? This page.