An ISO 17100 translation agency is the safest choice for any brand that ships a user manual into multiple language markets. User manuals are not marketing copy — an error in a safety warning, a mistranslated voltage rating, or a missing step in a maintenance procedure carries real consequences for the user and real liability for the manufacturer. ISO 17100 was written specifically to address those stakes. It defines the qualifications a translator must hold, the revision process every translation must go through, and the quality management system the agency must operate under. This article explains what ISO 17100 requires, why those requirements matter for user manual translation, and how to evaluate an agency that claims to be certified.
What ISO 17100 is
ISO 17100:2015 is the international standard that governs translation services. It is translation-specific: unlike generic ISO 9001 quality management, ISO 17100 addresses the exact problems that arise when language content moves between a source and a target market. It specifies requirements for the people who do the work, the revision process, the project management workflow, and the technology and data protection underlying every project. Agencies that want to claim certification are audited by an independent body and re-audited at regular intervals.
For user manuals, ISO 17100 matters because it is the only widely recognised standard that puts the revision step — a second qualified linguist reviewing the first translator's work — on a mandatory footing. That second pair of eyes is what catches the errors that would otherwise ship to market.
Specialist translators and revisers under ISO 17100
ISO 17100 specifies that language professionals — translators and revisers — must be suitably qualified. The standard accepts any one of three qualification paths:
- A recognised graduate qualification in translation from an institution of higher education
- An equivalent qualification (degree level) in another subject such as engineering, plus a minimum of two years of professional translation experience
- At least five years of full-time professional experience in translation
In practice, specialist translators working on user manuals frequently come from a technical background — engineering, electronics, mechanical design — and then cross over into translation as a second career. That combination matters because technical user manuals depend on terminology precision that a generalist linguist cannot always deliver. An engineer who also speaks two languages fluently understands that a torque value has to match the engineering spec, not a dictionary equivalent.
The revision workflow: the core of ISO 17100
Every ISO 17100 translation must be revised by a second qualified specialist translator before delivery. This is not optional, and it is not the same as proofreading. Revision means the reviser compares the source text and the target text side by side, checks terminology against the client's approved glossary, validates technical accuracy, and confirms that the translation reads naturally to a native speaker of the target language. On safety-critical documents, this step catches errors that would otherwise reach end users.
The revision step is the single biggest quality difference between an ISO 17100 agency and an uncertified provider. On a 20,000-word technical manual, a single specialist translator working alone will typically miss between 0.5 and 2 percent of the errors they introduce or fail to catch. The revision step eliminates most of that residual error rate. On a user manual for a power tool or a medical device, that difference is the difference between a safe document and a recall.
Quality assurance and workflow discipline
ISO 17100 certification requires a rigorous quality assurance process across every stage of a project. Agencies must maintain detailed project records, use approved terminology databases, operate under a documented project management workflow, and demonstrate continuous improvement based on what those records reveal. The effect on day-to-day work is that nothing gets skipped, nothing gets lost, and every recurring issue gets surfaced and addressed.
The workflow discipline matters more as brands scale. A single manual translated once is easy. A product range of fifty manuals translated into twenty-five languages, re-translated every time the product is updated, is a logistics problem that destroys quality when the workflow is ad hoc. ISO 17100 forces the discipline that makes multilingual scale sustainable, and the cost of running that discipline is quickly repaid through lower rework and fewer market complaints.
ISO 17100 and the current regulatory environment
User manual translation is no longer a soft compliance requirement. The EU General Product Safety Regulation (GPSR) came into force in December 2024 and requires that safety information ship with products in the language of the end market. The EU Accessibility Act became enforceable in June 2025 and extends to digital documentation, including PDFs delivered with products. The Right to Repair Directive 2024/1799 adds further documentation obligations for repair manuals. Across all three, a well-documented ISO 17100 workflow is the easiest way to prove that translation quality meets the requirements of market regulations, directives and laws.
How to evaluate an ISO 17100 translation agency
Not every agency that claims ISO 17100 actually holds current certification, and not every certified agency is a good fit for every project. When you evaluate a provider, ask for:
- A current ISO 17100 certificate from an accredited auditor, with the expiry date visible
- A description of the revision workflow and the qualifications of the revisers
- Evidence of a terminology management process (translation memory, approved glossaries)
- Data security and confidentiality practices, ideally backed by ISO 27001
- Specialist subject-matter expertise in your product category
For the broader case on human versus machine translation and when each fits, read machine vs human translation. For a deeper look at the editorial challenges of technical source material, see translating complex technical texts.
Next steps: how Impala can help
Impala is an ISO 17100-certified translation agency with specialist teams for user manual translation across more than 50 languages. Many of our translators come from former testing lab backgrounds at TÜV, DEKRA, and Intertek, which means the technical side of your documentation is in the hands of people who have audited products for a living. Explore our translation and localisation services or Get a Quote to discuss your next project.
