Thailand acceded to the 1961 Hague Apostille Convention on 30 June 2026; it enters into force for Thailand on 28 February 2027, so Apostilles are not yet issued. Thai documents are legalised at the Department of Consular Affairs, Ministry of Foreign Affairs, and then at the destination country mission where that country requires it.
We keep no permanent office in Chiang Mai — service is by appointment and courier through Bangkok Headquarters (Lat Phrao 95).
Chiang Mai hosts several foreign consulates, including the Consulates-General of the United States, China, Japan and India. Nationals of those countries may be able to complete some steps, such as signature or affidavit services, in Chiang Mai itself. Check each consulate’s current services first, because their scope is narrower than that of the embassies in Bangkok.
We do not keep a staffed office in Chiang Mai. We serve the province by appointment, by remote notarial service where the receiving authority accepts it, and by tracked courier for original documents. Combined with the consular legalisation counter described above, many northern clients can finish without a trip to Bangkok; we confirm which steps still need one before you book any travel.
Chiang Mai also has a large population of long-stay foreign residents. Many need proof of address or income for immigration or banking, and the right issuer depends on nationality: some consulates in Chiang Mai issue these letters, others require an embassy visit or a sworn statement attested in Thailand instead. Ask your own consulate first. If it cannot help, we can prepare an affidavit for attestation, and we will tell you plainly if the receiving office is unlikely to accept that alternative.
This list reflects the requirements published by the responsible authority on the verification date. Authorities may change their conditions, so confirm with the source before lodging. Department of Consular Affairs, Ministry of Foreign Affairs · verified 2026-07-31
The steps below are drawn from the procedures the responsible authority publishes itself, with the source and verification date shown. Some steps depend on the case and may change with the authority’s own announcements. Department of Consular Affairs, Ministry of Foreign Affairs · 2026-08-10
The destination country is not a party to the Apostille Convention
If the destination is not a party, the document needs consular legalization plus destination-embassy certification instead, so an apostille will not serve. Check the destination’s status before filing.
Filing a copy the issuing office has not certified
The officer must verify the issuing authority’s signature and seal; a self-made photocopy provides nothing verifiable. Obtain a certified true copy from the issuing office first.
The translation omits parts of the document
Seals, signatures and end-notes form part of the original. A translation that drops them is treated as not matching the original and must be corrected before re-filing.
Incomplete authority for the person filing
When not filing in person, a power of attorney with a copy of the grantor’s ID is required, and its scope must cover the specific filing.
We do not keep a permanent office in Chiang Mai. Clients there are served by appointment and courier through Bangkok Headquarters (Lat Phrao 95), the nearest permanently staffed branch. We never claim a shopfront where we have none.
In most cases no. Filings with central authorities such as the Department of Consular Affairs or an embassy can be handled on your behalf. Steps that legally require you in person — fingerprinting, or signing in front of the certifying attorney — cannot be delegated.
Turnaround depends on the responsible authority’s queue and rules at the time, so we publish no fixed figure. We tell you the authority’s own published window on the day you ask, plus the steps that usually cause delay.
Our team can review documents and coordinate translation, signature certification, legalisation and embassy steps within the agreed scope. Some steps may still require the document owner to appear or sign in person under the receiving authority’s rules.
We do not publish fixed prices: official fees, page counts and language pairs differ in every case. Send the document details and destination and we will scope the work and cost for your specific case.
Documents can travel by trackable EMS or private courier. Confirm the recipient, address and original-document handling before dispatch; the coordinating destination is Bangkok Headquarters (Lat Phrao 95).
Send the document details and the destination that will receive it. We map the correct chain before starting, flag what usually gets rejected, and run it end to end — as advisers, not just a filing agent.
Last reviewed: 2026-08-11 · Coverage across 77 provinces.