If you need to use a U.S. document in Spain, it must be authenticated with an apostille. Because both the United States and Spain are members of the Hague Convention, an apostille issued by the California Secretary of State verifies the authenticity of signatures and seals so your documents are legally accepted in Spain. Whether your paperwork is for citizenship, marriage, education, property matters, or business transactions, this guide explains how the apostille process wor

To get a birth certificate apostilled, the document must be an original or certified copy issued by the state or county in which the birth occurred, and the apostille must be processed in the same state where the document was issued.