What is an Apostille?
An Apostille is a single-page certificate created by the 1961 Hague Convention. As of June 2026, 126 contracting states accept it — including the United States, the EU, the UK, China, Japan, Australia and India. When BOTH the issuing and the receiving country are members, the Apostille replaces every consular step. Average issuance time is 1–3 working days.
Thailand's status in 2026
Thailand has not yet ratified the Convention. The Ministry of Foreign Affairs began consultations in 2018 and is currently in the final parliamentary phase, but instruments of accession have not been deposited. Therefore every document issued in Thailand for overseas use must still pass the legacy chain: (1) a registered Notarial Services Attorney, (2) the MFA Consular Department in Chaeng Watthana, and (3) the destination country's embassy in Bangkok.
Practical impact
Expect 7–14 working days end-to-end and THB 2,500–8,000 per set depending on language pair and destination embassy. Chinese, Indian and UAE embassies charge the highest legalization fees; Australia and New Zealand are mid-range; most European missions charge EUR 30–50 per page.
What if the destination IS a Hague member?
It does not matter. The Convention is reciprocal — both origin and destination must be members. Until Thailand deposits its instrument of accession, any 'Apostille' purportedly issued in Thailand is fraudulent.
Outlook
ASEAN Legal Affairs (2025 communiqué) places Thailand in the 'final consultation phase'. Should ratification pass, entry into force would follow approximately three to six months after gazette publication. Documents required in 2026–2027 should be planned around the existing chain.