Depending on what is your country of origin, in order for the documents from your country to be accepted for international use:
- the document has to pass the procedure of the so-called full legalization or
- you have to put an apostille on the document or
- the apostille may not be required.
What obligation will exist for you depends on whether the state from which the document originates is a signatory to the Hague Convention on the abolition of the need to legalize foreign public documents.
On the following link, you can find the list of the countries that are signatories to this convention.
As for the third category, in cases when an apostille is not necessary for international use, Serbia has signed a bilateral agreement on the mutual release of legalization of public documents (by that, for certain agreements, only some categories of public documents are released from legalization).
Serbia has concluded a bilateral agreement on the mutual release of public document legalization with the following countries: Algeria, Austria, Belgium, Belarus, BiH, Bulgaria, Czech Republic, Slovakia, France, Greece, Croatia, Italy, Iraq, Cyprus, Hungary, North Macedonia, Poland, Romania, Russian Federation, Montenegro, Ukraine, and Slovenia.