Apostille & Document Legalization for South Korea

Government agencies, universities, employers and courts in South Korea must be confident that a submitted document is genuine and was truly issued by an authorized Thai authority. The chain of authentication is the mechanism that lets documents cross borders legally. Skip any step and the document is rejected immediately on arrival in South Korea.

Because the Apostille Convention is not yet in force for Thailand (accession was approved by the Cabinet on 9 December 2025), legalization during the transition must still pass through the Department of Consular Affairs (Thai MFA) as the main checkpoint, and in many cases must be followed by endorsement from the South Korea embassy (สถานเอกอัครราชทูตเกาหลี ถนนสาทร) for an additional layer of verification. NYC Legal manages every checkpoint in one place.

For Thai nationals or foreign clients already living in South Korea, we work fully online-coordinated — simply send your original documents back to our Bangkok office, our team completes every certification step, and we ship the finished documents back to your address in South Korea via DHL.

Documents used in South Korea generally must be translated into Korean or English, depending on the receiving authority's requirements. Translation must be performed by a registered translator with a certification stamp, because substandard translation is one of the leading causes of document rejection.

Our translation team covers the world's major languages and works with NAATI translators, Ministry of Justice (MoJ) registered translators and sworn translators, so the translations we produce are accepted by embassies and authorities in South Korea.

The full end-to-end process for South Korea typically takes about 5–15 business days, depending on the number of documents, the language, and whether embassy legalization is required. Express handling is available for urgent cases.

Indicative fees: Thai–English translation THB 500–1,200/page, other languages THB 800–2,500, consular fee THB 200–800/set, consular legalization service THB 2,500–5,000/person. If embassy legalization is also required, add embassy fee THB 1,800–2,600/set, embassy handling THB 5,000–12,000, domestic shipping THB 100, worldwide THB 2,500.

The most frequent cases we handle for South Korea are employment (work permit, professional registration, employer background verification), study (university admission, credential recognition, scholarship reporting), family matters (marriage registration, spouse or dependent visas, birth registration of a child born in Thailand), and business (company affidavits, board resolutions, powers of attorney, distributor or tender documents). Each of these has a different receiving authority in South Korea, and each authority sets its own tolerance for how the certification chain must look on the page.

Employment-related files are usually the strictest: a South Korea employer or licensing body will normally insist on a police clearance certificate issued within the last three to six months, so timing the request correctly matters as much as the certification itself. We check these constraints during the free case assessment before any fee is charged, so you are never paying to certify the wrong document.

If you are unsure which of your documents actually needs legalization, send us photographs of the request letter or checklist you received from South Korea. In most cases the receiving authority has already told you the answer in wording that is easy to misread, and one review saves a full round of unnecessary certification.

Around four out of five rejections we are asked to rescue come from the same short list: submitting a photocopy where the receiving authority in South Korea required a freshly issued original; a translation produced by someone who is not a registered translator, so the certification stamp carries no weight; names transliterated inconsistently across passport, ID card and certificate; a document legalized in the wrong order (embassy before the Thai MFA rather than after); and certificates that were already too old on the day of submission.

A second, less obvious failure is scanning and reprinting a legalized set for convenience. South Korea authorities check the physical seal and the wet signature, and a reprint is not a legalized document.

Our pre-submission QA exists specifically to catch these before money is spent: we compare every name, date, document number and seal against the source document and against your passport, and we confirm the required order of certification with the receiving authority's current published requirements for South Korea.

A legalization stamp itself does not expire, but the document underneath it often does in the eyes of the receiving authority. Police clearance certificates, medical certificates and civil-status extracts are commonly required to be no more than three to six months old at the moment of submission in South Korea. Educational certificates and birth certificates are generally accepted regardless of issue date, because the underlying fact does not change.

If you need the same document at two different authorities in South Korea, ask for two legalized sets from the start. Producing a second set later means repeating the entire chain — new original, new certified translation, new Thai MFA legalization and, where applicable, new embassy endorsement — which costs far more than adding a duplicate set to the first submission.

Should a document already legalized for another country need to be reused for South Korea, it usually cannot simply be transferred: an endorsement addressed to one embassy is not evidence for another. We will tell you honestly during assessment whether your existing set can be reused or whether a fresh chain is genuinely required.

Every file is handled by a named case owner who stays with your documents from intake to delivery, so you are not re-explaining the case to a new person at each step. Translations are produced by registered translators — NAATI-certified, Ministry of Justice registered or sworn translators depending on the language and the receiving authority in South Korea — and are then reviewed a second time by a different linguist before certification.

Before any submission to the Department of Consular Affairs or to สถานเอกอัครราชทูตเกาหลี ถนนสาทร, the file passes a written QA checklist covering document originality, name consistency against the passport, date validity windows, translation certification wording, page order and set binding. We photograph each set at hand-over so there is a record of the exact condition in which it was submitted.

After delivery we keep a secure record of the case for future reference, which means a repeat request for South Korea — a renewal, a second authority, or a family member with the same document type — can be prepared much faster and with the wording that has already been accepted once.