Certified translation by language: what changes from one pair to another
Short answer
The certification route depends on the destination, not on the language. For use in Thailand, a foreign document is translated into Thai and the translation is certified by the Department of Consular Affairs. For use abroad, a Thai document is translated into the destination language, certified by the Ministry of Foreign Affairs, then legalised by that country's embassy in Bangkok. Australian authorities are the exception: they require NAATI-certified translation.
Clients often ask whether a translator is "certified" for a language. In Thai practice, certification attaches to the process rather than to a personal title: the Department of Consular Affairs compares the translation against the sealed original and certifies it. What differs by language is how easily that comparison can be made and how much room there is for divergence.
English pairs are the highest-volume route and the most standardised, which also means officers spot inconsistencies quickly. Names, dates, document numbers and issuing office names must be reproduced exactly as printed.
German, French, Japanese, Chinese, Korean, Russian and Arabic originals must be translated directly from the source text. A relay through English introduces the small deviations in transliteration and legal terminology that certifying officers treat as a mismatch.
For Australian purposes, translations must be produced by a translator certified by NAATI, the Australian national authority. This is a separate system from Thai consular certification and cannot be substituted by it. Our NAATI service is priced at 1,300–2,500 THB per document with a turnaround of 5–7 working days.
How to judge a provider
1. Direct translation from the source language
Ask explicitly whether your German or Japanese document is translated from the original or from an English version. Relay translation is the most common hidden defect.
2. Transliteration policy stated up front
The Thai spelling of a foreign name must match the spelling on your existing Thai documents, even where a different spelling would be more phonetically accurate.
3. The translator is identifiable on the file
Consular certification and most receiving authorities expect an identifiable translator with a signature and contact details, not an anonymous agency stamp.
4. Correct certification route for the destination
Consular certification for use in Thailand, MFA plus embassy legalisation for use abroad, NAATI for Australia. Providers who conflate these cost you a full cycle.
5. Formatting mirrors the original
Certifying officers read the translation next to the original. Tables, seals, marginal notes and stamp text should appear in the same positions and be described where they cannot be reproduced.
6. Subject-matter terminology
Court judgments, medical records, patents and financial statements need translators who work in that field; general fluency is not enough for terminology the receiving body checks.
7. Working-day turnaround per stage
Translation, consular certification and embassy legalisation each have their own timeline and should be quoted separately.
Which option fits your case
Thai–English certified translation
Best for: Most visa, immigration, academic and corporate filings
The standard route for both inbound and outbound documents.
View this service →NAATI-certified translation
Best for: Australian visas, universities, licensing bodies
Australian authorities accept only NAATI-certified translations. 1,300–2,500 THB per document, 5–7 working days.
View this service →Sworn translation for European destinations
Best for: Germany, France, Spain, Italy and other civil-law jurisdictions
Several European authorities require a sworn or court-appointed translator rather than a consular certification alone.
View this service →Court and Ministry of Justice translation
Best for: Litigation exhibits, judgments, evidence bundles
Court filings hold the translator accountable for accuracy of legal terminology.
View this service →Technical and specialised translation
Best for: Medical records, patents, engineering and financial documents
Terminology accuracy is verified by the receiving professional body, not just by a language check.
View this service →Translation for embassy submission
Best for: Documents going to a foreign mission in Bangkok
Each embassy sets its own language, format and copy requirements for the translation.
View this service →
Comparison
| Destination | Required translation route | Certifying body | Typical timeline |
|---|---|---|---|
| Thai government offices | Foreign document into Thai | Department of Consular Affairs, MFA | 2–3 working days for standard certification |
| Australia | NAATI-certified translation | NAATI-certified translator | 5–7 working days |
| Germany, France, Spain, Italy | Sworn or court-appointed translator, per authority | Destination authority requirements | Varies by mission |
| China, Vietnam, Gulf states | Translation plus MFA certification plus embassy legalisation | MFA and destination embassy | Depends on embassy queue |
| Hague states from 28 Feb 2027 | Translation plus Apostille instead of embassy legalisation | Designated Apostille authority | Shorter than the embassy chain |
The correct order of steps
Step 1 — Identify the receiving authority and its language rule
Ask the recipient which language and which certification they require in writing. Requirements differ between a university, a court and an immigration office in the same country.
Step 2 — Supply the sealed original plus your identity documents
The translator needs the original and your passport so names, dates and numbers are reproduced exactly.
Step 3 — Provide earlier Thai documents for spelling continuity
Any previous Thai-language record fixes the transliteration that must be reused.
Step 4 — Translate directly from the source language
Avoid relay translation for non-English originals so the certifying comparison holds.
Step 5 — Certify through the correct channel
Consular certification, embassy legalisation or NAATI, according to the destination identified in step one.
Mistakes that cause rejection
✕ Assuming a consular-certified translation is accepted in Australia
✓ Australian authorities require NAATI certification; the Thai consular seal does not substitute for it.
✕ Changing the spelling of a name to a more accurate version
✓ Match the spelling already used in your Thai records and note the variant separately if needed.
✕ Translating a Japanese or German document via English
✓ Commission a direct translation from the sealed original.
✕ Omitting seals, stamps and marginal notes
✓ Every mark on the original must be reproduced or described; officers check the layout side by side.
✕ Leaving certification to the last week
✓ Certification and embassy legalisation have separate queues; plan backwards from the filing deadline.
Frequently asked questions
Is there an official sworn translator register in Thailand?
Thailand does not operate a sworn-translator register in the European sense. Translations are certified by the Department of Consular Affairs, which compares the translation against the sealed original.
When do I need NAATI instead?
Whenever the document goes to an Australian government body, university or licensing authority. Our NAATI service is 1,300–2,500 THB per document with a 5–7 working day turnaround.
Can one translation be reused for several applications?
Often yes, if the certification layer matches each recipient's requirement. Keep scans of the certified set; some offices require a fresh original certification.
How long does certified translation take?
Translation itself depends on length and field. Consular certification is normally two to three working days for standard service, with same-day express at a higher government fee.
Which languages do you handle?
English, Chinese, Japanese, Korean, German, French, Spanish, Italian, Russian, Arabic and further pairs on request, with direct source-language translation rather than relay.
How do I get a quotation?
Send scans and tell us the destination authority by phone, LINE or email. Fees depend on language pair, document type, certification layer and deadline.
Talk to us before you file
Phone 083-249-4999 · Translation desk 081-562-0444 · LINE @NYC168 · contact@ilc.ltd
General information reviewed at the date shown on this site. It is not legal advice for an individual case, and approval always remains at the discretion of the reviewing authority.