A medium-of-instruction letter — what should you know about the certification chain?

This question is specifically about “A medium-of-instruction letter”, so it separates what is specific to this file from the standard certification chain. Education files normally pair a transcript with a qualification certificate, and institutions check both together. Prepare at least one spare certified set, since applications usually go to several institutions at once. Keep a copy of every source document plus the receipt or docket from each step. Note who signed each certification and on what date for later reference. Plan the schedule with room for at least one review cycle at the receiving office. Public holidays and embassy closures move certification queues more than most people expect. Before starting, count the number of certified sets needed before work starts, because extra sets restart the certification steps, then verify the source document is still within any validity window the recipient applies, then check that names are spelled identically to the passport or ID card on every page. What changes the timeline most here is whether the source documents are complete on day one. What sets this case apart is the number of certified sets and the window in which they must be used. The terms that frame this page are medium-of-instruction · letter · know · certification. The specifics here are document type: Medium, and those decide which translation and certification level applies. Once the set is complete, check it line by line against the destination's own checklist before filing. A Thai educational document intended for overseas use is normally translated into the language the destination requires, then legalised by the Legalisation Division of the Department of Consular Affairs, Ministry of Foreign Affairs, and where the destination requires it, further legalised by that country's embassy or consulate. Thailand deposited its instrument of accession to the Hague Apostille Convention on 30 June 2026, but the Convention is not yet in force for Thailand, so consular legalisation through the Ministry of Foreign Affairs and the relevant embassy remains the working route; always confirm the current requirement with the receiving authority before filing. ILC handles document work only — translation, certification of the translation, notarial signature certification and the legalisation run at the Ministry of Foreign Affairs and embassies. ILC is not an educational institution or a credential-evaluation body and cannot guarantee recognition or admission. Cost and lead time depend on page count, language pair and the certification steps the receiving authority requires, so every file is quoted before work starts. Send a scan of the documents together with the receiving institution's own instructions via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

ปรึกษาฟรี — LINE @NAATI · โทร 080-5578887 · อีเมล ilc@thainotary.co.th