Document legalisation in Thailand: what the MFA certifies and how to prepare
In short
Legalisation in Thailand means the Department of Consular Affairs, Ministry of Foreign Affairs, certifies the signature and seal of the official who issued a document, or certifies that a translation matches the original. It does not certify that the facts in the document are true. The usual order is: obtain a current original from the issuing authority, translate the document in full, submit it for legalisation, then have the destination country's embassy legalise it again if that country requires it.
Types of legalisation
Certification of a translation
Confirms that a Thai–English or English–Thai translation matches the original submitted alongside it. The original, or a copy certified by the issuing authority, must always be attached.
Certification of an official's signature
Confirms that the signature and seal on a Thai official document match the specimen the issuing authority filed with the Department of Consular Affairs.
Certified true copy
Confirms that a copy matches the original presented. Commonly used for civil registration records and education documents.
Documents issued abroad
Foreign documents must first be certified by the competent authority of that country and by the Royal Thai Embassy or Consulate there before they can be submitted for further certification in Thailand.
Step by step
1. Obtain a current original
Request the document from the issuing authority — district registrar, school, or licensing body. Make sure seals and signatures are legible; degraded photocopies are commonly rejected.
2. Translate the document in full
Every element must be rendered: letterhead, Garuda emblem, document number, endorsements, marginal notes, and the text inside every stamp. Spell names exactly as in the passport across the whole document set.
3. Submit for legalisation
Lodge the original together with the translation and identification of the applicant, following the channels and forms published by the Department of Consular Affairs. Processing times and fees are those published by the department at the time of lodgement.
4. Collect and use the document
Re-check names and dates once the legalisation stamp is affixed. If the destination requires embassy legalisation as well, that is the final step.
Legalisation vs NAATI vs notarisation vs Apostille
| System | Who certifies | What is certified | Typical destination |
|---|---|---|---|
| Legalisation | Department of Consular Affairs, MFA Thailand | The signature and seal of the issuing official, or that a translation matches the original | Foreign authorities and embassies that require documents to pass through the Thai MFA |
| NAATI certified translation | A NAATI-certified translator | The accuracy of the translation, attested by a credentialed translator | Australian authorities such as the Department of Home Affairs and skills assessing bodies |
| Notary Public (Thailand) | A Notarial Services Attorney admitted by the Lawyers Council of Thailand | Signing in the attorney's presence, or that a copy matches the original shown | Private documents: powers of attorney, affidavits, company records |
| Apostille | The competent authority of a contracting state | The origin of a signature or seal, in a single form recognised between contracting states | Only between states party to the Apostille Convention — check current status with the HCCH |
Common rejection reasons
- • Submitting a translation without the original or an authority-certified copy attached.
- • Leaving parts of the document untranslated — stamp text, endorsements, or the reverse side.
- • Name spellings that do not match the passport, or that vary between documents in the same set.
- • Using an extract issued longer ago than the destination authority's validity window.
- • Assuming legalisation certifies that the facts stated in the document are true.
- • Assuming legalisation can replace a NAATI translation — many Australian authorities specifically require the NAATI system.
FAQ
How is legalisation different from a certified translation?
Legalisation is the umbrella term for the certification services provided by the Department of Consular Affairs. Certifying a translation is one type of legalisation: it confirms the translation matches the original, not that the underlying facts are true.
Do documents for Australia need legalisation?
It depends on the receiving authority. Many Australian authorities accept translations produced by NAATI-certified translators without legalisation, while some processes — for example registering a marriage or dealing with certain state agencies — may ask for further certification. Always follow the published requirements of the specific authority.
Do I need to bring the original?
Generally yes: the original, or a copy certified by the issuing authority, must be presented. Self-made photocopies are usually not accepted.
How long does it take?
Translation typically takes 1–3 business days per set. The legalisation step itself varies with the lodgement channel and queue volume, so check the department's current processing times and fees before booking travel.
Can someone lodge on my behalf?
An authorised representative can generally lodge on your behalf under the conditions and authorisation documents the department specifies. Check the current list of supporting documents before attending.
Can a document issued overseas be legalised in Thailand?
Yes, but it must first be certified by the competent authority of the issuing country and by the Royal Thai Embassy or Consulate there.
Does Thailand issue Apostilles?
Accession status to the Apostille Convention can change. We do not confirm it on behalf of any authority — check the HCCH website and the Department of Consular Affairs announcements before planning your document chain.
What if a name is misspelled after legalisation?
It must be corrected at source: amend the translation or obtain a fresh original, then lodge again. The department does not alter documents it has already certified.
Related reading
Reviewed August 2026. General procedural information, not legal advice. Fees, processing times and requirements are those published by the Department of Consular Affairs, MFA Thailand; Apostille Convention status should be checked with the HCCH.