Embassy legalisation for use in Thailand
The chain exists to move trust from a Venetian register to a Thai counter. The office that issued your record is known to the Prefettura or the Procura, which stamps the signature it recognises. The destination's mission in Italy knows that Italian stamp and seals over it. A Thai office reads the last seal, takes the rest on the strength of it, and asks no further questions.
What the Thai consular desk looks for
Consular legalization for Thailand goes smoothly when the file is complete on arrival and rough when it is not. Every page of the record travels together, translation included, and nothing is opened or re-stapled once sealed. Because a Thai name written in Latin letters has several honest spellings, the file should settle on the passport version and repeat it, so the Italian text and the Thai one never disagree on who the person is.
The Venice → Thailand route step by step
Start where the record lives, not where you live. Collect the signed original, then match it to the Prefettura or the Procura by who signed it: administrative papers to the first, judicial and notarial to the second. Pay the tax stamp, take the Italian legalisation, and only then send the file on to the destination's mission, which adds the seal that ends the process.
Cost and timing on this route
Embassy legalization for Thailand from Venice costs a known amount in Italy and an amount set abroad. The Italian figure is the €16 tax stamp for each document. The consular figure belongs to the destination. As for the clock, standard handling is 10–15 business days across the whole chain, express is 3–5 business days, and both counts start from a file that is already signed and complete.
Points that belong to Thailand alone
Document legalization for Thailand puts unusual weight on the translated page, because that is the page the receiving office actually reads. Keep the Italian original and its Thai text in one sealed unit so neither can be doubted alone. Write dates with the month spelled out, since a numeric Italian date can be read in another order abroad, and a date that reads two ways is the fastest way to lose a week.