1. What is Apostille? An Apostille (pronounced “ah-po-steel”) is a French word meaning certification. It certifies the authenticity of a public document, signature or stamp. It is a form of authentication issued to documents for use in countries that participate in the Hague Convention of 1961. Here is a list of countries that accept Apostilles. The apostille ensures that public documents issued in one member country will be recognized as valid in another member country. Sin