The short version
The word comes from the French apostille, meaning a marginal note or annotation. Under the 1961 Hague Convention Abolishing the Requirement of Legalisation for Foreign Public Documents, member countries agreed to replace the old chain of consular legalizations with a single standardized certificate. That certificate is the apostille.
When a foreign registrar, university, court or employer receives your document, the apostille tells them: the signature on this document belongs to a real official, that official held the stated office, and the seal is genuine. They can then accept it without contacting the U.S. agency that issued it.
What an apostille certifies — and what it does not
An apostille certifies only three things:
- The authenticity of the signature on the document.
- The capacity in which the signer acted (for example, “Notary Public” or “Deputy Registrar of Vital Statistics”).
- The identity of the seal or stamp on the document.
It does not certify that the document’s contents are true, that a translation is accurate, or that the document will be accepted for a particular purpose in the receiving country. A foreign registrar can still reject an apostilled birth certificate because it is too old for their rules, or because it needs a sworn translation.
What an apostille looks like
Every apostille follows the same format fixed by the Convention. It carries the title “APOSTILLE” with the French subtitle “(Convention de La Haye du 5 octobre 1961)”, followed by ten numbered fields:
| Field | What it contains |
|---|---|
| 1. Country | United States of America |
| 2. Signed by | Name of the official who signed the underlying document |
| 3. Acting in the capacity of | The signer’s office (Notary Public, County Clerk, Registrar, etc.) |
| 4. Bears the seal/stamp of | The authority whose seal appears on the document |
| 5. At | City where the apostille was issued |
| 6. The (date) | Date of issue |
| 7. By | The competent authority that issued the apostille |
| 8. No. | Apostille registration number |
| 9. Seal/Stamp | Seal of the competent authority |
| 10. Signature | Signature of the issuing official |
In the United States the certificate is usually a separate sheet stapled or otherwise permanently attached to the document, embossed or printed with the state or federal seal. Some states print it on security paper; a growing number also issue electronic apostilles (e-apostilles) as digitally signed PDFs — see electronic apostilles.
Who issues apostilles in the United States
The U.S. has designated two kinds of competent authority:
- State authorities — usually the Secretary of State of each state (or an equivalent office such as the Lieutenant Governor in Hawaii, the Department of State in Florida and Pennsylvania, or the Secretary of the Commonwealth in Massachusetts and Virginia) for documents issued or notarized in that state. See apostilles by state.
- The U.S. Department of State, Office of Authentications — for documents issued by federal agencies or signed by federal officials, such as FBI background checks, military discharge papers and IRS letters. See federal apostilles.
Which one you need depends entirely on who signed or issued the document, not on where you live or where you are sending it. State or federal? walks through the test.
When you need one
You need an apostille whenever a foreign authority in a Hague Convention country asks for a “legalized”, “authenticated” or “apostilled” U.S. document. Typical situations:
- Applying for citizenship by descent (Italy, Ireland, Poland, Mexico and others) with U.S. birth and marriage records.
- Registering a marriage abroad, or marrying abroad with a U.S. single-status affidavit.
- Residency and work visas that require an FBI or state background check.
- Enrolling in a foreign university with a U.S. diploma and transcript.
- Buying property or opening a bank account abroad with a power of attorney signed in the U.S.
- Registering a foreign branch or subsidiary with U.S. corporate documents.
- Claiming a foreign pension or settling an estate with a U.S. death certificate.
If the destination is not a Hague member, an apostille will not be accepted. You need an authentication certificate followed by legalization at that country’s embassy or consulate — explained in apostille vs. authentication.
Apostille, authentication, legalization, notarization
These words are often used interchangeably, which causes most of the confusion:
- Notarization is performed by a notary public and verifies the identity of a person signing a private document. It is often the first step before an apostille, never a substitute for one.
- Apostille is issued by a competent authority for a Hague country.
- Authentication (sometimes “certification”) is the equivalent certificate for a non-Hague country. It looks different and must be followed by consular legalization.
- Legalization is the final stamp from the destination country’s embassy or consulate, only required for non-Hague destinations.
A common misconception
An apostille is not “international notarization”, and a notary cannot issue one. Only the competent authority can. Likewise, the apostille is attached to the original public document (or a properly notarized copy), not to a photocopy you make at home — see certified copies vs. notarized copies.
Frequently asked questions
Does an apostille expire?
The apostille itself has no expiry date. However, the receiving country may require the underlying document to be recent — for example, many civil registries only accept birth or marriage certificates issued within the last 3 to 12 months. See Does an apostille expire?
Can I get an apostille for a photocopy?
Not directly. A competent authority apostilles the signature of a public official. A photocopy carries no such signature. You can usually have a notary certify the copy (where state law allows) or obtain a fresh certified copy from the issuing agency, and apostille that.
Is an apostille the same in every country?
The ten-field format is standardized by the Convention, so an apostille from Texas and one from Spain contain the same fields. The paper, seal, size and language of the headings vary, and some countries issue them electronically.
Do I need an apostille for Canada, the UK or Mexico?
Yes — all three are Hague Convention members (Canada since January 2024). Non-member destinations such as the United Arab Emirates, Qatar, Kuwait, Egypt, Thailand or Vietnam before 2026 need authentication and embassy legalization instead. Check the country pages.
