A national of the United States applying for the Long Term Resident (LTR) visa — how should the supporting documents be translated and certified?

The point raised here is “A national of the United States applying for the Long Term Resident (LTR) visa”, so the answer below starts with what this case actually needs before setting out the general rules. Documents with a short validity window should be produced as close to the filing date as possible. When several certification layers are required, start with the slowest one. Keep a copy of every source document plus the receipt or docket from each step. Attach a document index to the bundle so nothing is lost during review. If any requirement is still unclear, send a sample image to the receiving body before producing the full set. The specifics here are destination: Us, and those decide which translation and certification level applies. The terms that frame this page are national · United · States · applying. The condition most often overlooked is that name spelling must match across every document in the set. The deciding factor is the receiving body's requirement, not only the format of the Thai-side document. Before starting, confirm with the receiving body whether it wants an original, a certified copy or a certified translation, then check that names are spelled identically to the passport or ID card on every page, then verify the source document is still within any validity window the recipient applies. Supporting documents issued abroad — police clearance, marriage and birth certificates, qualifications or financial papers — normally need translation into Thai or English by an accountable translator and the certification the receiving office specifies, usually legalisation at the Department of Consular Affairs and/or the issuing country's embassy. On Apostille: Thailand deposited its instrument of accession on 30 June 2026, but the Convention is not yet in force for Thailand, so the working route is still consular legalisation — the Department of Consular Affairs first, then the destination embassy. Fees and scheduling depend on the number of documents, the source language, which authority must certify them and the destination country; we confirm scope in writing before starting. Send the checklist you were given, the applicant's nationality and the post or office you will file with 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