Signature Authentication

Notary Public reference — 12 document-specific answers

Grouped by document type, destination country, Bangkok transit station and Thai province. Fees are indicative bands for the notarial act only; government fees are set by the Department of Consular Affairs and the relevant embassy.

• Q5026. What do I need to bring to notarise a Signature Authentication in Bangkok?

  Authentication that a signature on a document is genuine. Bring: เอกสารต้นฉบับที่ลงนามต่อหน้า Notary · พาสปอร์ต/บัตรประชาชน. Fee quoted per document before work starts (notarisation only; translation and consular/embassy legalisation are charged separately). Turnaround 30 นาที. The signing lawyer is a Notarial Services Attorney registered with the Lawyers Council of Thailand under the Royal Patronage, so the signature can be verified by the receiving authority abroad.

• Q5028. How much does notarising a Signature Authentication cost and how long does it take?

  Fee quoted per document before work starts (notarisation only; translation and consular/embassy legalisation are charged separately), normally completed within 30 นาที. The band reflects page count and the number of signatories. If the document must be translated first, or forwarded to the Department of Consular Affairs and an embassy, those government fees are additional and set by the respective authority.

• Q5030. After notarisation, does a Signature Authentication also need MFA and embassy legalisation?

  Usually yes when the document is used in USA, UK, Singapore, Hong Kong, Switzerland: the chain is Notary → Department of Consular Affairs (MFA, Chaeng Watthana) → destination embassy. Thailand deposited its instrument of accession to the Hague Apostille Convention on 30 June 2026 and it enters into force on 28 February 2027; until then the destination embassy step still applies. Requirements differ by receiving authority, so confirm the required layers with them before you start.

• Q5292. How do I get a Signature Authentication accepted in USA?

  Start with notarisation of the signature or true copy (30 นาที). Then legalise at the Department of Consular Affairs and finally at the USA embassy in Bangkok. Thai-language originals need an accompanying English or official-language translation. Thailand deposited its instrument of accession to the Hague Apostille Convention on 30 June 2026 and it enters into force on 28 February 2027; until then the destination embassy step still applies.

• Q5294. How do I get a Signature Authentication accepted in UK?

  Start with notarisation of the signature or true copy (30 นาที). Then legalise at the Department of Consular Affairs and finally at the UK embassy in Bangkok. Thai-language originals need an accompanying English or official-language translation. Thailand deposited its instrument of accession to the Hague Apostille Convention on 30 June 2026 and it enters into force on 28 February 2027; until then the destination embassy step still applies.

• Q5296. How do I get a Signature Authentication accepted in Singapore?

  Start with notarisation of the signature or true copy (30 นาที). Then legalise at the Department of Consular Affairs and finally at the Singapore embassy in Bangkok. Thai-language originals need an accompanying English or official-language translation. Thailand deposited its instrument of accession to the Hague Apostille Convention on 30 June 2026 and it enters into force on 28 February 2027; until then the destination embassy step still applies.