Thailand Document Legalization
Apostille soonUsing US documents in Thailand · Asia
Thailand is not yet a Hague member (it joins on February 28, 2027), so US documents need authentication plus embassy legalization. The chain: state or federal certification, then U.S. Department of State — Office of Authentications authentication ($20/doc), then legalization at the Royal Thai Embassy — Consular Office.
| Hague status | Joins February 28, 2027 |
|---|---|
| Embassy legalization needed? | Yes |
| State documents go to | The issuing state's competent authority |
| Federal documents go to | U.S. Department of State — Office of Authentications ($20/doc) |
| Embassy | Royal Thai Embassy — Consular Office — 2300 Kalorama Road NW, Washington, DC 20008 · $15/doc |
Your exact steps for Thailand
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The full legalization chain, in order
- Get the correct base document (certified vital-records copy, or notarize the document)
- State authority certification — ask for an authentication for a non-Hague country, not an apostille (state documents only, until the Convention takes effect)
- U.S. Department of State, Office of Authentications — $20 per document
- Royal Thai Embassy, Washington D.C. — consular legalization ($15 per document / per U.S. Department of State seal)
- Thai Ministry of Foreign Affairs (Legalization Division) verification after arrival in Thailand (commonly required)
Embassy details & fees
Royal Thai Embassy — Consular Office — 2300 Kalorama Road NW, Washington, DC 20008. Consular legalization is about $15 per document. Legalization fee is $15 per document (per seal of the U.S. Department of State), payable by money order or cashier's check to the Royal Thai Embassy. This full legalization route applies until the Apostille Convention enters into force for Thailand on February 28, 2027. Embassy website →
Timeline & cost, worked out
For a state document: the state fee (roughly $10 in many states) + $20 federal authentication + $15 embassy = about $45 in government fees. Budget several weeks — federal authentication alone runs about 5+ weeks by mail.
Which documents does Thailand usually ask for
- Marriage certificate (state example: California)
- Single status affidavit (state example: California)
- Diploma / degree certificate (state example: California)
- FBI background check (Identity History Summary) (federal)
- Birth certificate (state example: California)
State documents vs federal documents
The routing never depends on Thailand — it depends on who issued your document. A birth certificate, diploma, or notarized paper is a state document, apostilled or certified by the issuing state. An FBI background check, IRS letter, or naturalization certificate is federal and goes only to the U.S. Department of State — Office of Authentications.
Frequently asked questions
＋Does Thailand accept a US apostille?
Not yet. Thailand joins the Apostille Convention on February 28, 2027. Until then a US document needs full authentication and Thailand embassy legalization. After that date, an apostille alone is enough.
＋What is the order of steps for Thailand?
Get the correct base document, obtain the state or federal certification, have the US Department of State authenticate it, then legalize it at the Royal Thai Embassy — Consular Office.
＋How much does legalization for Thailand cost?
The US Department of State charges $20 per document, plus the state fee for state documents. The Royal Thai Embassy — Consular Office charges about $15 per document.
＋How long does the Thailand legalization chain take?
Plan for several weeks. The federal authentication step alone runs about 5+ weeks by mail, and the embassy step adds more. Start early, especially for visa deadlines.
More country requirements
Sources
Reviewed by Billy Reiner, Editor
Last verified: July 13, 2026 against the HCCH status table and the Royal Thai Embassy — Consular Office(official page). See how we verify and how often on ourmethodology page.
This is informational, not legal advice. The receiving authority sets the final requirements — confirm with them and the office named above before you send anything.