Certified Translation in Portugal — Complete Guide 2026
Everything you need to know: types, process, costs, timelines and legal requirements
Get a Free QuoteCertified translation in Portugal is a legal requirement whenever documents written in a foreign language need to be submitted to Portuguese official authorities — courts, civil registries, universities, AIMA (Agency for Integration, Migration and Asylum) or government bodies. The certification attests that the translation is faithful and complete to the original document, giving it legal validity in Portuguese territory. If you need certified translation for a specific project, explore our certified translation services and how we ensure legal compliance for every document.
It is essential to distinguish certified translation (Portugal) from sworn translation (Brazil — "tradução juramentada") and sworn translation (Spain — "traducción jurada"). In Portugal, there is no "sworn translator" figure — certification is performed by a lawyer or notary who confirms the translator's identity and the faithfulness of the translation to the original. In Brazil, the Public Translator and Commercial Interpreter (TPIC) is appointed through a public examination by the Junta Comercial. In Spain, the traductor jurado is appointed by the MAEC. Each system only has legal validity in its respective country. If you need to translate immigration documents, see our immigration translation guide.
Choosing a company with ISO 17100 certification is the best quality guarantee for certified translation. This international standard defines rigorous requirements for translation service providers: qualified translators, independent review processes and documented quality management. M21Global operates according to this standard, ensuring every translation follows the TEP process (Translation, Editing, Proofreading) before being submitted for certification. Learn about our ISO certification and how it elevates quality standards.
What is certified translation and when is it required
A certified translation is a translation accompanied by a formal declaration attesting its faithfulness to the original document. In Portugal, this certification is performed by a lawyer or notary, who confirms the translator's identity and that the translation faithfully corresponds to the source document. It is, therefore, an act of authentication, not linguistic validation — the legal professional does not assess the translation quality itself, but certifies who performed it.
The entities requiring certified translation in Portugal are numerous and span virtually every sector of public administration and the judicial system. Portuguese courts require that any document in a foreign language submitted as evidence or procedural attachment be translated and certified. AIMA, in visa, residence permit and family reunification processes, requires certified translation of all personal documents. Civil registries, particularly for marriage, birth or nationality processes, require translated foreign certificates. Portuguese universities, for recognition of foreign academic degrees, require translated diplomas and certificates. The IRN (Institute of Registries and Notaries) and DGAE also require translated and certified documentation in various administrative procedures.
The difference between certified and simple translation is significant. A simple translation has no formal validation — it is a translated text without any guarantee of authenticity or accountability. A certified translation, on the other hand, has legal value: it identifies the translator, is accompanied by a sworn declaration and, when necessary, notarial recognition or lawyer certification. For official processes, only certified translation is accepted. See also our legal translation services and immigration translation guide for specific contexts.
Certified translation vs sworn translation: understanding the differences
The terms "certified translation", "sworn translation" and "tradução juramentada" are frequently confused, but they refer to distinct legal systems in different countries. Understanding these differences is essential to ensure your translation has legal validity in the destination country.
In Portugal, the term used is certified translation (tradução certificada). There is no "sworn translator" figure nor an official list of state-recognised translators. The translation is performed by a qualified professional translator and then its authenticity is confirmed by a lawyer or notary, who certifies the translator's identity and attests that the translation is faithful to the original. This system relies on the professional responsibility of the translator and the public faith of the lawyer or notary.
In Brazil, the system is that of sworn translation (tradução juramentada), performed exclusively by the Public Translator and Commercial Interpreter (TPIC — Tradutor Público e Intérprete Comercial). This professional is appointed through a public examination organised by the Junta Comercial of each state and holds public faith — meaning their translation has, by itself, legal value without requiring additional certification by a lawyer or notary. Brazilian sworn translation is recognised by all official Brazilian entities but does not automatically have validity in Portugal or other countries.
In Spain, the system is based on the sworn translator-interpreter (traductor-intérprete jurado) figure, appointed by the MAEC (Ministry of Foreign Affairs). The Spanish sworn translator is qualified through an official examination, and their translation has legal value in Spain without additional certification.
In Angola, translation certification is performed by a notary. Angola is not a member of the Hague Convention, meaning that Angolan documents intended for Portugal (or vice versa) require consular legalisation instead of an apostille. There is no sworn translator figure in Angola.
In summary: Portugal = lawyer/notary; Brazil = TPIC with public faith; Spain = MAEC-appointed sworn translator; Angola = notary + consular legalisation. Each system is only valid in its respective country — for international use, a Hague Apostille or consular legalisation may be required depending on the destination country.
How the certification process works in Portugal
The certified translation process in Portugal involves several well-defined stages, each with a specific role in ensuring the quality and legal validity of the final translation. Understanding these stages helps you appreciate the value and costs involved.
Step 1 — Translation by a qualified professional translator. The translation is performed by a native translator with training and experience in the document's subject area — legal, medical, technical or other. The translator must master both the source and target languages at a professional level and know the specific terminology of the sector. At M21Global, all translators meet ISO 17100 requirements.
Step 2 — Independent review (TEP process). After translation, a second linguist — the reviewer — verifies the translation independently. This process, called TEP (Translation, Editing, Proofreading), is mandatory under ISO 17100. The reviewer compares the translated text with the original, checking terminological accuracy, fluency, consistency and completeness. Learn more about our continuous improvement processes.
Step 3 — Certification by lawyer or notary. The translator signs a declaration of faithfulness and responsibility for the translation. A lawyer or notary then certifies the translator's signature — confirming who signed, but not validating the linguistic content. This is an important distinction: the lawyer or notary performs an authentication function, not a review. The cost typically ranges from €20 to €50 per document.
Step 4 — Hague Apostille (if required). When the certified translation is intended for use in a Hague Convention signatory country, an apostille may be needed — a certificate issued by the Procuradoria-Geral da República that validates the document's authenticity for international use. For non-member countries (such as Angola), consular legalisation is required instead.
This four-step process ensures that the certified translation is not only linguistically accurate but legally valid and recognised by the destination authorities.
How much does certified translation cost in Portugal
The cost of certified translation in Portugal depends on several interacting factors that make each project unique. Understanding these factors helps you evaluate quotes and avoid surprises.
Language pair: The linguistic combination is the most determining factor in price. Translations between common European languages (English, French, Spanish, German to Portuguese) have more accessible base prices, typically between €0.08 and €0.12 per word. Less common languages or those with different alphabets (Chinese, Japanese, Arabic, Russian) have higher prices, between €0.12 and €0.18 per word, due to lower availability of qualified translators.
Complexity and specialisation: A birth certificate has standardised terminology and is quick to translate. A commercial contract, medical report or court ruling requires specialised knowledge and precise terminology, which is reflected in the price.
Urgency: Delivery timeline directly influences cost. Standard translations (3-5 business days) are at base price. For urgent deliveries in less than 24 hours, a supplement of 25% to 50% applies, compensating for the need to allocate priority resources.
Notarial certification: Translation costs are supplemented by certification costs. Lawyer certification typically costs between €20 and €50 per document. The Hague Apostille, when required, has an associated fixed fee.
High volumes: For clients with multiple documents or recurring projects, translation memories significantly reduce costs — previously translated segments are not charged at full price. This is an important advantage for businesses with regular certified translation needs.
M21Global offers free, detailed quotes within 2 business hours. Submit your documents through our quote form to receive a no-obligation proposal. We also match the price of any ISO-certified competitor for the same service — see our price matching policy.
Timelines: how long does certified translation take
Delivery timelines for certified translation depend on the type and volume of documents, content complexity and certification availability. Here are typical timelines for different scenarios.
Simple document (1-page certificate): 24 to 48 business hours. Standardised documents such as birth, marriage or criminal record certificates have stable terminology and reduced volume, allowing translation, review and certification within a short timeframe. This is the most common scenario for individual immigration processes.
Complex document (10+ page contract): 3 to 5 business days. Contracts, financial reports, court rulings or extensive technical documents require more translation and review time due to terminological complexity and text volume. The complete TEP process is especially important in these cases.
Complete dossier (immigration, 5-10 documents): 5 to 7 business days. Immigration, nationality or company incorporation processes involve multiple documents that must be translated consistently and individually certified. Project management coordinates all elements for a coherent delivery.
Urgency: For situations with tight legal deadlines — a court hearing, an AIMA response deadline, a university enrolment deadline — we offer urgent service with a 25-50% supplement. We reorganise priorities to guarantee delivery within the required timeframe without compromising quality.
Additional factors: Total timeline may be affected by the lawyer or notary's availability for certification (typically an additional 24 hours) and, when needed, obtaining the Hague Apostille (variable time depending on the issuing authority). We recommend starting the process as early as possible, especially for dossiers with multiple documents.
Most common documents requiring certified translation
Certified translation covers a wide range of documents, organised by category according to the context in which they are most frequently required.
Personal and civil status documents: Birth, marriage and death certificates are the most commonly translated documents for immigration, nationality and marriage processes in Portugal. Criminal records are required in virtually all administrative processes. Foreign passports and identification documents also require translation when submitted as supporting documentation.
Academic documents: University diplomas, training certificates, academic transcripts and academic recommendation letters are needed for degree recognition processes, enrolment in Portuguese universities and scholarship applications. The DGES and universities require certified translation of these documents.
Professional documents: Foreign driving licences, professional certificates, practice licences, employer reference letters and technical qualification certificates need certified translation for professional recognition in Portugal, especially in regulated professions (doctors, engineers, lawyers).
Business documents: Commercial contracts, articles of association, powers of attorney, financial and audit reports, meeting minutes and corporate resolutions require certified translation for international business operations, establishing branches in Portugal or commercial court proceedings.
Immigration documents: Residence permits, visas (D7, D2, D3, D4, D8), family reunification, proof of income, bank statements, health insurance and employment contracts — all these documents require certified translation when submitted to AIMA. See our complete immigration translation guide for detailed information on each process type.
Hague Apostille: when and how to obtain one
The Hague Convention, formally the Convention Abolishing the Requirement of Legalisation for Foreign Public Documents, was adopted in 1961 and radically simplifies the document legalisation process for international use between signatory countries.
What is an apostille: The Hague Apostille is a standardised certificate, issued by a competent authority in the document's country of origin, that attests the authenticity of the signature, the capacity in which the document signatory acted and, if applicable, the seal or stamp's authenticity. Once apostilled, the document is recognised in any Convention member country without additional consular legalisation.
Where to obtain an apostille in Portugal: The competent authority for issuing apostilles in Portugal is the Procuradoria-Geral da República (Attorney General's Office). Applications can be made in person or, in some cases, by post. Fees and timelines vary depending on document type and application volume.
When it is required: An apostille is needed when a Portuguese public document (including certified translation with notarial recognition) is intended for use in a Hague Convention signatory country. Most European, American and many Asian countries are members.
When it is NOT required: An apostille is not needed in two main situations. First: when documents are for exclusive use within Portugal. Second: when the destination or origin country is not a Convention member — in this case, consular legalisation is required, a lengthier process involving the destination country's consulate or embassy.
Relevant non-member countries: Angola, some Middle Eastern and African countries are not Convention members. For documents destined to or from these countries, M21Global guides clients through the appropriate consular legalisation process. Check the official member countries list on the HCCH website.
How to choose a certified translation company
Choosing a translation company for certified documents should be based on objective criteria that guarantee quality, legal compliance and personal data protection. These are the most important factors to consider.
ISO 17100 certification: This is the international reference standard for translation services. An ISO 17100 certified company has annually audited processes, verified translator qualifications, mandatory separation between translation and review, and documented quality management. Ask to see the certificate. Learn about M21Global's ISO certification.
Native translators with sector specialisation: A good translation company assigns native target-language translators with proven experience in the document's sector — legal, medical, technical, financial. Specialisation drastically reduces the risk of terminological errors that can invalidate an official document.
Documented TEP process: The TEP process (Translation, Editing, Proofreading) means each translation is checked by at least two different professionals. This is an ISO 17100 requirement and the best guarantee that errors are detected before certification.
NDAs and data protection (GDPR): Documents for certified translation frequently contain sensitive personal data — identification numbers, financial information, health data, criminal records. The company must fully comply with GDPR, offer project-specific NDAs when requested, and have clear information security protocols.
Price transparency: Be wary of vague or "starting from" quotes. A serious company provides detailed quotes with final pricing, cost breakdown (translation, review, certification, apostille), confirmed delivery date and clear payment terms.
Realistic timelines: Unrealistic delivery promises (certified translation of a 20-page contract in 2 hours) are a warning sign. Quality requires time for translation, independent review and certification. A professional company presents realistic timelines and meets them. Learn about our certified translation company and why clients choose us.
Frequently Asked Questions
A certified translation is a translation accompanied by a formal declaration attesting its faithfulness to the original document. In Portugal, certification is performed by a lawyer or notary, who confirms the translator's identity and the correspondence between the translation and the source document. It is required for documents submitted to courts, civil registries, AIMA, universities and other official entities. See our certified translation services.
In Portugal, certified translation is authenticated by a lawyer or notary. In Brazil, sworn translation (tradução juramentada) is performed by a Public Translator appointed through public examination, with inherent public faith. In Spain, sworn translation (traducción jurada) is done by translators appointed by the MAEC. Each system only has validity in its respective country — for international use, a Hague Apostille or consular legalisation may be required.
Costs depend on language pair, document complexity and urgency. Prices typically range from €0.08 to €0.15 per word for translation, plus €20 to €50 for lawyer or notary certification. Urgent deliveries (under 24h) carry a 25-50% supplement. M21Global offers free quotes within 2 hours and matches the price of any ISO-certified competitor.
Simple document (1-page certificate): 24-48 business hours. Complex document (10+ page contract): 3-5 business days. Complete dossier (immigration, 5-10 documents): 5-7 business days. Urgent service available with supplement. Timelines include translation, independent review (TEP) and lawyer or notary certification.
In Portugal, translation certification is performed by lawyers or notaries. These professionals certify the translator's identity and attest that the translation is faithful to the original, but they do not assess the linguistic quality of the translation itself. There is no "sworn translator" figure in Portugal as exists in Brazil or Spain.
It depends on the destination country. If the document is intended for a Hague Convention member country (most European and American countries, many Asian countries), the apostille simplifies legalisation. If the destination is a non-member country (such as Angola), consular legalisation is required. For use exclusively in Portugal, no apostille is needed. M21Global guides you through the correct procedure for each situation.
Technically possible, but not recommended. Lawyer or notary certification only attests the translator's identity, not the translation quality. If the translation contains errors, these will have legal consequences (document rejection, process delays, retranslation costs). Many entities require translation by a professional translator with verified qualifications. Using an ISO 17100 certified company guarantees quality and acceptance.
A certified translation itself does not have an expiry date — it remains valid as long as the original document is valid. However, some entities may request an updated translation if the original document was issued a long time ago (for example, certificates older than 6 months). M21Global offers discounted updates for clients needing more recent versions of previously translated documents.
AIMA requires certified translation of all foreign-language documents, including: birth, marriage and death certificates; criminal records; diplomas and academic certificates; employment contracts; proof of income; bank statements; health insurance; and proof of address. The exact list depends on the process type (D7, D2, D3, D4, D8 visa, family reunification). See our complete immigration translation guide.
Yes. M21Global offers certified translation with lawyer certification and notarial recognition, as required by the destination entity. We identify which certification level is needed for your specific case, include the cost in the quote and handle the entire process — translation, review, certification and, if necessary, Hague Apostille. We are an ISO 17100 certified company with over two decades of experience.
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Certified Translations
Certified translation service for official authorities.
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Documents translated for AIMA, visas and residence.
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Processes audited according to ISO 17100.
Learn moreLegal Translation
Specialised translation in legal terminology.
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