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Notarial Services

Document Authentication

Preparing documents for the further legalisation an embassy or ministry requires — the whole chain mapped before you start, so nothing is rejected at step three.

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Tell us the situation and we will tell you what we think you should do — and what it will cost.

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Who this is for

  • People sending Thai documents to a foreign authority
  • People bringing foreign documents into use in Thailand
  • Companies filing Thai corporate documents overseas
  • Anyone whose document was rejected for missing a legalisation step

What we handle

Scope of work

Mapping the full chain your destination requires, before any fees are paid

Attorney certification as the first link in that chain

Certified translation where the destination requires it

Preparation for Department of Consular Affairs legalisation

Preparation for the destination embassy’s requirements

Foreign documents inbound — what Thai authorities will accept and what they will not

How it works

How we run the matter

  1. Identify the destination and its exact requirements
  2. Map the full chain and its order
  3. Certify the document as the first step
  4. Arrange certified translation where required
  5. Prepare the file for the Ministry and the embassy
  6. Confirm the finished document meets the original requirement

Documents to prepare

  • The document to be authenticated, in original
  • Passport or Thai ID card
  • The destination country and the purpose of the document
  • The receiving body’s written requirements, if provided
  • Any previous rejection notice

Common questions

No — Thailand is not a party to the Apostille Convention, so documents follow the longer legalisation route instead: attorney certification, then the Ministry of Foreign Affairs, then the destination country’s embassy. If a foreign body asks you for an apostille, this chain is the answer to give them.
Typically: the document is issued or certified, translated if required, legalised by the Department of Consular Affairs, then legalised by the destination embassy. Each step checks the one before it, so an error early is only discovered late — which is exactly why the chain is mapped at the start. NOTARIAL_LIMITS
The attorney’s certification is quick; the government and embassy steps set the real timetable and vary by embassy and season. Plan generously and start early — deadlines are missed at the embassy stage far more often than at ours. NOTARIAL_TIMEFRAME
Mirrored, not identical: the document is usually legalised in its home country and at the Thai embassy there, then translated and, for many purposes, recorded with the relevant Thai authority. Tell us what the document is for in Thailand and we work backwards from that requirement.
Usually — most rejections are procedural: a missing step, wrong certificate wording, an untranslated page, or a name that does not match across documents. Bring the rejected document and whatever the authority said; the fix is often narrower than it looks.

Lawyers for this matter

Generation 1 Chanin Taongern

Founding Partner

Chanin Taongern

40+ years of courtroom and advisory experience

LitigationBusiness advisoryEmployment lawCivil and criminal matters
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Generation 2 Pongsanan Taongern

Partner

Pongsanan Taongern

Modern legal practice, business advisory and international client support

Corporate advisoryEmployment lawCross-border family lawInternational client servicesLegal workshops
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Related reading

Notarial & Documents 2026-08-065 min read

Getting a Thai document accepted abroad: the legalisation chain

Thailand issues no apostille, so documents travel by a longer route. Mapping the whole chain before the first step is what prevents a rejection at the third.
Notarial & Documents 2026-08-065 min read

Powers of attorney for use in Thailand

Signed abroad and rejected at the counter is a common and expensive outcome. What makes a power of attorney work here, and why narrow beats general.

Official sources

The Thai authorities and legislation this work is carried out under. Requirements change; we confirm the current position for your matter.

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