What do these certification terms mean?
Apostille, authentication, legalization, and attestation are related terms, but they are not interchangeable.
Authentication
Authentication generally verifies an official signature or seal. The U.S. Department of State distinguishes that function from verifying whether the document’s contents are true. The office that handles authentication depends on who issued the document and where it will be used.
Apostille
An apostille is a certificate used under the Hague Apostille Convention. It verifies the origin of an official signature or seal for use in another participating country. U.S. state documents and federal documents use different offices.
Legalization
For some destinations outside the Hague Apostille Convention, a document may involve authentication followed by another step through an embassy, consulate, or other office for the destination country.
Attestation is not one universal certificate
In international document work, “attestation” is an umbrella term rather than one standard U.S. certificate. Depending on the country or organization, it can describe a declaration, a certification, or part of a legalization chain. If instructions say only “attestation,” check the organization or authority that issued the instructions for the exact document, certificate, and office it expects.
State documents and federal documents take different routes
A U.S. state-issued document, such as a state vital record, generally uses the competent authority for the issuing state when an apostille or state authentication is appropriate. Certain federal documents use the federal authentication route through the U.S. Department of State. A notarized private document can follow a different route because the relevant signature may be the notary’s signature rather than a government-record issuer.
That distinction identifies the likely authority. It does not determine what a particular foreign organization or destination country requires.
Official starting points
- U.S. Department of State — Prepare documents for authentication
- U.S. Department of State — Authenticate Your Document
- HCCH — Apostille Section