Certified Translator in Belgium: Difference with the Sworn Translator-Interpreter

The terms "certified translator," "sworn translator" and "professional translator" are often used interchangeably in Belgium - but they refer to very different things. Understanding which type of translation you need can save you time, money and rejected documents. This guide explains what a certified translator in Belgium actually means and when each category applies.

📖 See also: sworn translator (traducteur juré) Belgium · online sworn translation: is it valid? · certified translator Brussels

Certified, sworn, professional: what is the difference?

In Belgian usage, these three terms describe distinct levels of translator qualification:

• Sworn translator (traducteur assermenté / beëdigd vertaler): a translator who has sworn an oath before a Belgian Court of Appeal and is registered on the SPF Justice national list. Their translations carry legal certification and are required for official documents (birth certificates, court orders, diplomas for NARIC) submitted to Belgian authorities.
• Certified translator: in Belgium, this term does not have a specific legal definition. It is often used to describe a professional translator who holds a recognised quality certification such as ISO 17100, which sets standards for translation services, workflows and quality control. A certified translation (without a sworn oath) is not legally equivalent to a sworn translation.
• Professional translator: a trained, qualified translator working to professional standards, but without sworn or ISO-certified status. Suitable for business, marketing, technical and editorial translations that do not require official certification.

When does a certified (non-sworn) translation suffice?

A certified professional translation (without sworn status) is appropriate in a wide range of situations:

• Corporate communications: websites, brochures, presentations, annual reports
• Technical and scientific documents: manuals, patents, medical literature
• Commercial contracts between private parties (when no Belgian authority is involved)
• Internal company documents: HR policies, training materials, procedures
• Marketing and advertising content
• Academic research and publications

In these cases, a sworn translation is unnecessarily expensive and adds no legal value. A high-quality professional translation - ideally produced under an ISO 17100 quality framework - is entirely appropriate.

When is a sworn translation mandatory in Belgium?

Belgian law and administrative practice require sworn translations for specific categories of official documents:

• Civil status documents (birth, marriage, divorce, death certificates) for Belgian municipalities and the DVZ
• Criminal records submitted to Belgian authorities for naturalisation, employment or residence
• Foreign judgments and court orders for recognition in Belgium
• Diplomas submitted to NARIC Belgium for academic recognition
• Documents submitted as evidence in Belgian court proceedings
• Notarial documents involving international parties

ISO 17100: what it means for translation quality

ISO 17100 is the international standard for translation services. It defines requirements for the translation process, including translator qualifications, revision procedures, project management and quality controls. A translation agency working to ISO 17100 standards guarantees that every translation undergoes a structured review process - not just a single-translator check. This matters for business documents, legal texts and technical content where accuracy is critical. TranslateBE applies ISO 17100-aligned quality controls to all non-sworn professional translations.