Thailand does not accept apostille
This is the first thing to establish, because it inverts the advice applicants find everywhere else.
Thailand is not a party to the Hague Apostille Convention. An apostille issued by India’s Ministry of External Affairs is of no use for a Thai authority, and obtaining one is wasted money and time.
The route instead is consular legalisation: authentication in India, then attestation by the Royal Thai Embassy or Consulate in India. Thai authorities then commonly require the document to be translated into Thai and that translation legalised by Thailand’s own Ministry of Foreign Affairs after arrival.
That last step matters and is frequently missed. For many official purposes the Thai translation must be legalised in Thailand, which means an Indian certified translation may serve as a working document rather than as the final deliverable. Ask the Thai authority — the district office, the labour department, the university — what they require before commissioning anything, because the answer determines what is worth paying for here.
Marriage registration
A common reason for this pair. Registering a marriage in Thailand generally requires an affidavit of marital status confirming that the Indian party is free to marry, issued or attested through the Indian Embassy in Bangkok, then translated into Thai and legalised.
Indian practice produces no exact counterpart to what the Thai district office expects, so this is usually created specifically for the purpose. As a privately executed document it follows the longer authentication route, and the sequence — affidavit, attestation, translation, legalisation — has to happen in the right order or a step is wasted.
We translate the affidavit and supporting documents accurately and precisely. We cannot advise on Thai family law, and we will say so rather than implying a translation settles questions it does not.
Script and names
Thai is written without spaces between words, with word boundaries inferred by the reader. Tone marks and vowel signs attach above, below and around consonants rather than running in a line.
For names this matters. Rendering an Indian name into Thai script is a phonetic choice, and Thai lacks distinct representations for several sounds common in Indian names. One name can be written several defensible ways.
As with other non-Latin destinations, consistency across your documents matters more than the individual choice. If you already hold a Thai rendering of your name — on a prior visa, a work permit, an existing record — send it so we match it rather than introducing a second form partway through a residence process.
What to send
Complete pages, edges included, both sides, with every seal legible. Tell us which Thai authority the document is going to and what exactly they asked for, since the legalisation requirements differ between purposes and getting the sequence right is most of the job.