Apostille for Portugal: U.S. Documents

By Frank MetayerUpdated August 16, 2026

Portugal is a member of the Hague Apostille Convention, so a U.S. document headed to Lisbon, Porto, or the Algarve is authenticated with a single apostille rather than the older, slower consular legalization. That one distinction shapes everything below: you do not route these documents through a Portuguese consulate, and — as of 2026 — you do not need an embassy stamp. What you do need is the correct U.S. apostille authority for each document and, in most cases, a certified Portuguese translation. Because a country's Hague status can change, confirm Portugal's current membership before you file.

The requests we see most for Portugal are practical, life-in-country ones: Americans exchanging a U.S. driver's license for a Portuguese one, FBI background checks for residency and visa applications, birth and marriage certificates, university diplomas, and single-status affidavits for couples marrying in Portugal. Each follows a slightly different path — a state-issued driver's license is handled very differently from a federal FBI check — so this guide walks through them one at a time, mapped to the Portuguese authority that receives each: the IMT for licenses, AIMA for residency, the Conservatória for civil-registry and marriage matters, and universities or the DGES for academic documents.

Key takeaways

As of 2026, Portugal is a Hague Apostille Convention member, so U.S. public documents are certified with an apostille — never consular legalization at a Portuguese consulate. Because membership can change, confirm it before filing.
The authority depends on the document: FBI background checks and other federal papers are apostilled by the U.S. Department of State; birth and marriage certificates, notarized diplomas, and single-status affidavits are apostilled by the Secretary of State of the state that issued or notarized them.
The most common Portugal request is exchanging a U.S. driver's license — typically a notarized copy of the license, apostilled by the state where it was notarized, then translated into Portuguese. You never apostille the plastic card itself, and you confirm the exchange rules with the IMT.
A certified Portuguese translation is commonly required, and the apostille normally goes on the document first, before translation, so the apostille itself appears in the translated version.
Processing times vary by authority and document. Start time-sensitive items like an FBI check early, and confirm each receiving authority's current requirements before you submit.

Portugal takes an apostille, not consular legalization

Portugal has been part of the Hague Apostille Convention for decades and remains a member as of 2026. In practical terms, a public document issued in the United States is made valid for use in Portugal with one certificate — an apostille — attached by the competent U.S. authority. There is no second step at a Portuguese consulate or embassy, which is the rule only for non-Hague destinations that still require full consular legalization.

This matters for two reasons. First, it keeps the authentication on U.S. soil: every apostille you need is issued by a U.S. Secretary of State or the U.S. Department of State, and no Portuguese office adds anything before you send the document. Second, the receiving authority in Portugal — a civil registry (Conservatória), a university, the IMT driving authority, or AIMA for immigration — expects an apostille specifically, so a document that arrives with the wrong certification, or none, gets rejected. Because Hague membership and country lists do change, confirm Portugal's current status before you begin; our guide on which countries accept an apostille is a useful starting point.

Exchanging a U.S. driver's license for a Portuguese one

This is the single most common reason Americans need an apostille for Portugal. Once you become a resident — on a D7, D8 (digital-nomad), or similar pathway — Portugal generally expects you to exchange your U.S. license for a Portuguese one through the IMT (Instituto da Mobilidade e dos Transportes) within a limited window, rather than driving indefinitely on the U.S. card. Missing that window can push you into a full local licensing process, so it is worth handling early.

The apostille solves a simple problem: the IMT needs to confirm your license is genuine, and you cannot apostille a plastic card. The practical path is to have a photocopy of your license notarized, apostilled by the Secretary of State of the state where the notarization took place, and then translated into Portuguese by a certified translator. Some applicants are also asked for an official driving record or abstract from their state DMV. Because a U.S. license is a state credential, this is always a state-level apostille — never a federal one.

One caveat matters: Portugal exchanges a non-EU license only where a reciprocity arrangement is in effect between Portugal and the issuing country or state, and the exact document list varies by state and changes over time. Some applicants exchange with no test; others are asked to sit a theory or practical exam. Confirm the current requirements — and the exchange deadline — directly with the IMT, or with the Portuguese consulate serving you if you are still in the United States, before you file.

FBI checks and federal documents go to the U.S. Department of State

An FBI Identity History Summary — the FBI background check — is frequently required for Portuguese residency and visa applications, and it is part of the file AIMA reviews for many residence permits. It is a federal document, which means only the U.S. Department of State's Office of Authentications in Washington, D.C. can apostille it; a state Secretary of State cannot. Sending an FBI check to a state office is one of the most common and consequential missteps, because it comes back unusable and you lose the turnaround time.

Most applicants obtain the report through an FBI-approved Channeler, then route the printed result for the federal apostille. Watch the recency window: Portuguese consulates and authorities typically want a background check issued within the last several months, so do not apostille an old copy — confirm the exact age limit the receiving office accepts. If your timeline is tight, get the FBI check moving first, since federal authentication can run longer than a state apostille. The same federal path applies to other U.S. government-issued documents.

State documents: birth, marriage, diplomas, and single-status affidavits

Birth and marriage certificates are state records. Order a certified copy from the vital-records office in the state that issued it — which may not be the state you live in now — and apostille it through that same state's Secretary of State. A hospital souvenir certificate or an uncertified printout cannot be apostilled; you need the certified government copy.

Diplomas and academic transcripts usually travel as a notarized copy — or a registrar-signed copy — that is then apostilled by the Secretary of State where it was notarized; if a Portuguese university or the DGES (Direção-Geral do Ensino Superior) is recognizing the degree, ask which form they require. If you are marrying in Portugal, the Conservatória generally asks for a single-status affidavit — a sworn statement that you are free to marry — signed before a notary, apostilled at the state level, then translated. Across all of these, keep names consistent between documents and mind any recency requirement the Portuguese authority sets, because a mismatch or an out-of-date certificate is a frequent reason for rejection.

Certified Portuguese translation: when, and in what order

Portuguese authorities commonly require a certified translation of your U.S. documents into Portuguese. The order of operations matters: in almost every case you apostille the original document first and translate afterward, because the apostille — and everything it certifies — must appear in the translated version. Translating before the apostille is attached usually means the translation has to be redone once the apostille is added.

How the translation must be certified depends on the receiving office. Portugal often expects the translation to be certified by a notary, a lawyer, or through a qualified translator's declaration, and in some situations a translation prepared in the United States is itself certified or apostilled. Because this is one of the more variable parts of the process, confirm with the specific Conservatória, university, or IMT office whether the translation must be produced in Portugal or can be done in the United States before you submit it.

The step-by-step, and the mistakes that cause rejections

The reliable sequence for any Portugal-bound document is: (1) identify the document and the Portuguese authority that will receive it; (2) obtain the correct certified or notarized version; (3) route it to the right apostille authority — the state Secretary of State for state records and notarized copies, or the U.S. Department of State for federal documents like an FBI check; (4) arrange the certified Portuguese translation; and (5) submit the apostilled, translated package.

The mistakes we see most are avoidable. People translate a document before it is apostilled; they send a federal FBI check to a state office, or a state record to the federal authority; they try to apostille the physical driver's license instead of a notarized copy; they use an FBI check that is months too old; they overlook name mismatches between documents; and they miss the IMT deadline to exchange a license. Getting the authority and the order right the first time is what keeps a Portugal filing from bouncing back.

Getting documents ready for Portugal?

Tell us what you are sending to Portugal and where each document was issued. We will route every item to the right authority — the issuing state's Secretary of State or the U.S. Department of State — arrange the certified Portuguese translation, and give you a flat, all-in quote before any work begins, with no hidden fees and no obligation.

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Frequently asked questions

How long does it take to get an apostille for Portugal?+

It depends on which authority handles each document. A state Secretary of State apostille and the U.S. Department of State's federal apostille run on separate schedules that shift with volume, and federal authentications in particular can take several weeks or longer. As of 2026, confirm current processing times before you file, and start time-sensitive items — such as an FBI check that must be recent — as early as possible. Expedited handling is available for many documents.

How much does an apostille for Portugal cost?+

It depends on the document, the issuing authority, and how fast you need it. You get a flat, all-in quote before any work begins — with no hidden fees, and no obligation.

Who issues the apostille — Portugal, a state, or the U.S. federal government?+

A U.S. authority always issues it; Portugal does not, and because Portugal is a Hague member you never legalize at a Portuguese consulate. Federal documents such as an FBI background check are apostilled only by the U.S. Department of State in Washington, D.C. State documents — birth and marriage certificates, notarized diplomas, single-status affidavits, and notarized copies of a driver's license — are apostilled by the Secretary of State of the state that issued or notarized them.

Do I need a certified Portuguese translation?+

In most cases, yes. Portuguese authorities commonly require a certified translation into Portuguese, and the apostille is normally attached to the document first so it appears in the translation. How the translation must be certified — and whether it can be done in the United States or must be produced in Portugal — depends on the specific office receiving it, so confirm that requirement before you submit.

What is the most common mistake people make with documents for Portugal?+

For driver's licenses, the top mistake is trying to apostille the plastic card itself instead of a notarized copy of it. More broadly, people translate a document before it is apostilled — so the apostille is missing from the translation — or send a federal FBI check to a state Secretary of State, or a state record to the federal authority. Getting the correct authority and the correct order the first time is what prevents a rejection.

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