It is one of the most common questions we receive: can a freelance translator — a sole trader working alone — obtain ISO 17100 certification? The short answer is: yes, but with important caveats. This article explains the full picture, including when ISO 17100 is the right choice and when an alternative standard such as ISO 18587 might be more appropriate.

ISO 17100 Was Designed Primarily for Agencies

ISO 17100:2015 specifies requirements for translation service providers (TSPs) — organisations that provide translation as a service. The standard was designed with agencies and larger language service providers in mind, because several of its core requirements assume a multi-person workflow.

Most notably, ISO 17100 requires that every translation be revised by a second qualified linguist who did not perform the original translation. This is a fundamental quality control requirement. For a solo freelancer working alone, this creates a practical challenge: you cannot revise your own work to satisfy this requirement.

This does not mean individual translators are excluded from certification — but it does mean they need to think carefully about how to structure their workflow.

How Freelancers Can Satisfy the Revision Requirement

A freelance translator who wants ISO 17100 certification has several options for meeting the two-person revision requirement:

  • Partner with another qualified translator — Two freelancers can formalise a mutual revision arrangement, creating a micro-agency structure that satisfies the standard. Each revises the other's work, with documented procedures and signed agreements.
  • Subcontract revision — You can hire a qualified reviser for a defined portion of your workflow. The reviser does not need to be a permanent employee, but their qualifications must be documented and the revision must be a formal part of your process.
  • Operate as a registered business entity — If you operate as a limited company or equivalent legal entity (even as a sole director), certification bodies can assess your business as a TSP rather than as an individual. Your company can then certify, with the documented use of a qualified reviser.
Freelancers who have obtained ISO 17100 certification typically do so by formalising their subcontracting arrangements and treating revision as a non-negotiable process step, not an optional extra.

What Solo Translators Actually Need to Prepare

For a freelance translator pursuing ISO 17100 certification, the documentation and procedural requirements are the same as for agencies, just scaled appropriately:

  • Your own CV and qualification records — Including your translation degree, language certificates, and specialist subject matter experience
  • A documented translation workflow — Even if you are the only translator, you need written procedures covering project intake, translation, revision, review, and delivery
  • Reviser qualification documentation — CVs, diplomas, and competency evidence for whoever performs revisions
  • Signed revision agreements or subcontracts — Formalising the arrangement with your reviser(s)
  • A quality policy — A brief statement of your quality objectives and commitment to meeting client requirements
  • Confidentiality procedures — How you protect client data and ensure subcontractors sign NDAs
  • A complaint and corrective action process — Even a simple documented procedure for handling and learning from errors

ISO 18587: The Better Fit for Post-Editors

If you are a freelance translator who specialises in machine translation post-editing (MTPE), ISO 18587:2017 may actually be a more relevant and achievable certification. This standard covers full post-editing of machine translation output, and its structure is more naturally suited to individual practitioners.

ISO 18587 specifies competency requirements for post-editors and the processes for producing post-edited content. Unlike ISO 17100, it acknowledges the role of MT systems as part of the production pipeline, making it directly relevant to the growing number of translators working with neural MT output.

The revision requirements in ISO 18587 are handled differently, reflecting the nature of MTPE workflows. Certification under this standard demonstrates to clients that you meet internationally recognised quality standards for AI-assisted translation — a credential that is rapidly growing in commercial value as MT adoption increases across the industry.

How TranslationCert Helps Sole Traders

TranslationCert, powered by BALTUM Bureau, offers certification pathways specifically designed for smaller operations, including sole traders and micro-agencies. Our approach includes:

  • Scaled documentation packages — Templates designed for small operations, not bloated corporate quality manuals
  • Flexible revision solutions — Guidance on structuring legally compliant revision arrangements with partners or subcontractors
  • Standard selection support — We help you choose between ISO 17100 and ISO 18587 based on your actual service offering and client needs
  • Fully online audit — No on-site visits. Your entire certification is handled remotely via video conference and document review
  • Affordable pricing — Certification costs are scaled to business size; solo practitioners do not pay agency rates

Practical Steps for Freelancers

  1. Determine the right standard — ISO 17100 for human translation services, ISO 18587 if you primarily do MTPE work. Both can be combined if relevant.
  2. Identify your reviser — Contact a trusted colleague or professional network contact. Agree on a mutual arrangement or subcontracting terms.
  3. Document your workflows — Write down what you actually do, step by step. TranslationCert provides templates to make this straightforward.
  4. Prepare your qualification file — Compile your CV, diplomas, references, and sample work in the relevant language pairs.
  5. Request a quote from TranslationCert — Our team will guide you through the rest of the process, including scheduling your Stage 1 and Stage 2 audits.

Key Takeaway for Freelancers

ISO 17100 certification is possible for individual translators, but it requires formalising a revision arrangement with a second qualified linguist. If you work primarily with MT output, ISO 18587 may be a better fit. TranslationCert offers tailored support for both pathways at pricing that works for sole traders.

Certification as an individual translator is a powerful differentiator. It signals that you operate to the same quality standards as larger agencies — giving corporate and government clients the confidence to engage you directly for high-value work.

Ready to explore ISO certification as a freelance translator?
Request a tailored quote from TranslationCert or take a free readiness assessment at baltum.ai. Our team will recommend the right standard for your situation.