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An Apostille Certificate is an official certificate issued to documents so they will be recognised in member states without further Legalisation.
Once a document has had an Apostille attached to it confirming the authenticity of signatures and seals it can be presented to any country which recognises the Apostille.
Typically the Apostille Certificate is issued by the state from which the document originates although in some cases another state can issue the Apostille.
The sole function of the Apostille is to certify the authenticity of the signature on the document; the capacity in which the person signing the document acted; and the identity of any stamp or seal affixed to the document.
The 1961 Hague Convention abolishes the Requirement of Legalization for Foreign Public Documents. The Convention provides for the simplified certification of public (including notarized) documents to be used in countries that have joined the convention. Under the Hague Convention, signatory countries have agreed to recognize public documents issued by other signatory countries if those public documents are authenticated by the attachment of an internationally recognized form of authentication known as an "apostille". The Apostille ensures that public documents issued in one signatory country will be recognized as valid in another signatory country.
There are currently over 60 member states of the Hague convention and in addition to those countries many other countries will also recognize an Apostille certificate
Croatia is member of the Hague Convention of 5 October 1961.
In general, Croatia requires the documents you have to submit for your civil wedding to be stamped by Apostille. However, there are countries with whom the state of Croatia has signed additional agreements so it may very well be that you will be asked for an Apostille stamp on one document yet not on the other.