Can I write my own will in English and just sign it in front of reputable witnesses?

You can write your own will, but for it to be valid in Thailand, it must comply with Thai legal formalities. This typically means the will should be written in Thai or officially translated, signed in front of two witnesses (who must also sign), and ideally kept in a secure location.

English-language wills are not automatically recognised unless translated and properly processed. While a handwritten or typewritten will may be valid, we strongly recommend having it reviewed to ensure it will be upheld in court.