Apostille vs Authentication
vs Legalization

Destination country determines the path

What an Apostille Is

An apostille is an international authentication certificate established by the Hague Apostille Convention text (HCCH) — formally the Hague Convention of 5 October 1961 Abolishing the Requirement of Legalisation for Foreign Public Documents. It is a single-step certificate that any Hague member country must accept from any other Hague member country, replacing what would otherwise be a multi-step legalization chain.

An apostille authenticates the signature, seal, or stamp of a public official on the underlying document — a notary public, county clerk, state registrar, or federal officer. It does not authenticate the content of the document. The receiving country accepts the apostille as proof that the signature is genuine and that the signer was authorized to sign at the time. The current member list is maintained by the HCCH at the current Hague Convention member list.

What Authentication Is

Authentication, in U.S. usage, is the domestic certification step that confirms a public official’s signature. For California-source documents, the California Secretary of State’s Notary Public Section is the authenticating authority. For federal documents, the U.S. Department of State Office of Authentications in Washington, D.C. is the authority.

Outside the United States — and in older U.S. legal writing — “authentication” can also refer to the broader process that includes both the domestic certification and the foreign embassy step. In modern U.S. usage, “authentication” typically means the federal-level certificate when a document is destined for a non-Hague country and requires embassy legalization next.

When the destination is a Hague member, the U.S. domestic authentication is the apostille — the same certificate, just labeled “apostille” because the Hague Convention governs the format. When the destination is not a Hague member, the U.S. domestic authentication is the first step, followed by embassy legalization.

What Legalization Is

Legalization is the multi-step embassy or consulate certification process required when the destination country is not a party to the Hague Convention. A typical legalization chain runs: notary or issuing authority → state or federal authentication → U.S. Department of State authentication → destination-country embassy or consulate in the U.S. Each step certifies the previous step’s signature.

Legalization is slower than apostille (multiple separate filings) and costs more (each step has its own fee). The countries that currently require legalization rather than apostille include the United Arab Emirates, Qatar, Kuwait, Egypt, Lebanon, Jordan, and several others. Membership changes over time — China joined the Convention in November 2023, eliminating the need for legalization for China-bound documents. See embassy or consulate legalization for the current process.

Why the Destination Country Decides

The document type does not determine which route applies — the destination country does. A California birth certificate going to Italy gets an apostille. The same California birth certificate going to the UAE goes through embassy legalization. An FBI background check going to Germany goes through U.S. Department of State authentication (issued as an apostille because Germany is Hague). The same FBI check going to the UAE goes through U.S. Department of State authentication followed by UAE embassy legalization.

The first question on every filing is: is the destination country a Hague Convention member as of today? Membership changes — verify against the current Hague Convention member list before filing.

Where Each Document Type Goes

See eligible California documents for the full document-type table.

What Apostille San Francisco Does

Apostille San Francisco prepares, reviews, and submits documents to the California Secretary of State on a client’s behalf. For federal documents, we prepare the federal authentication routing to the U.S. Department of State. For non-Hague destinations, we route the document through the full embassy or consulate legalization chain. The first step in any of these paths is the $45 Document Check, which confirms which of the three routes applies before any fee is paid.