Apostille vs. Embassy legalisation for Thailand
There are two ways to make an Italian paper usable abroad, and only one of them is open here. The short way ends with a single certificate. The long way, consular legalisation, adds a foreign mission's stamp to the Italian one. Thailand is on the long way until the Convention begins to work in that country.
Thailand's Hague status and what it means
Thailand's place in the Convention begins in 2027, with effect from 28 February 2027 in that country. A date in the future does not help a file that has to be lodged next month, so the practical answer for now is the consular chain. Treat the date as a planning line: a job that starts close to it may be finished under the new rule.
The Trieste to Thailand route step by step
Order the original, get it signed by the office that holds the record, then take it to the Prefettura in Trieste or to the Procura della Repubblica. Attach the sworn translation. Send the stamped set to Thailand's mission in the capital, and wait for it to come back with the consular mark before you post anything abroad.
Cost and timing for this route
Two charges again: the fixed €16 Italian tax stamp, and a consular fee that the mission sets. The timing depends less on the desks than on the post, because every file from Trieste makes a round trip that a Roman file does not. Building a week of slack into the plan costs less than missing a filing date.
Destination-specific requirements
Thai offices read Thai, so a translation travels with almost every file, and it is stamped with the original rather than bolted on afterwards. Retirement and marriage files usually want civil records; work files usually want a degree and a police record. Keep multi-page papers bound and stamped as one document, because a loose page is refused at the counter.