NAATI-certified translation
A translation produced and stamped by a translator holding a credential from Australia’s NAATI.
Authority: NAATI (National Accreditation Authority for Translators and Interpreters)
NAATI-certified translation compared with Thai consular-legalised translation
Quick answer
The difference is who certifies and who receives. A NAATI translation is certified by a translator holding a NAATI credential, which Australian agencies verify directly from the practitioner number. A Thai certified translation is built for the MFA legalisation layer so Thai and foreign government offices can accept it. Some files need both, because the paperwork travels through both systems.
What each option is
Thai certified translation + MFA legalisation
A translation signed by the translator in the prescribed form, then passed through signature legalisation at the MFA.
Authority: Department of Consular Affairs, MFA
Comparison table based on published requirements
| Criterion | NAATI-certified translation | Thai certified translation + MFA legalisation |
|---|---|---|
| Who certifies | The credentialed translator certifies, using their own stamp and practitioner number. | The translator signs, then an official certifies that the translator’s signature is genuine. |
| Primary receiving bodies | Australian bodies — immigration, education providers and professional organisations that name NAATI in their notices. | Thai government offices, foreign missions in Thailand, and overseas bodies that rely on the legalisation chain. |
| How it is verified | Check the practitioner’s credential status in NAATI’s online directory using the practitioner number. | Check the MFA legalisation stamp and reference number, kept with the official receipt. |
| What must appear on the page | Translator stamp, name, credential number, language direction and a statement that it is a true translation of the original. | A certification statement, the translator’s signature, and the original or issuer-certified copy attached alongside. |
| Interchangeable? | Cannot substitute for a legalised Thai translation when the receiving body requires the legalisation layer. | Cannot substitute for NAATI when an Australian body names NAATI in its published requirement. |
| When both are needed | Thai documents filed in Australia whose outcome later has to be used with Thai agencies. | Documents that clear a Thai authority first and are then filed with an Australian body requiring NAATI. |
Which route fits which case
- NAATI-certified translation: The Australian receiving body’s notice literally says NAATI or certified translator.
- Thai certified translation + MFA legalisation: The receiver is a Thai authority, a mission in Thailand, or requires the legalisation chain.
Mistakes that get files sent back
- Ordering a NAATI translation when the receiving body sits in Thailand and needs the legalisation layer.
- Supplying an original that was never certified as a copy, so the translation cannot be filed.
- Assuming a credential covers every language pair — credentials are tied to a pair and direction.
- Letting the name spelling differ from the passport, which sends the file back.
Frequently asked questions
- Does a NAATI translation also need MFA legalisation?
- It depends on the receiver. An Australian body that requires NAATI generally does not ask for it, but bringing the paperwork back into the Thai system means entering the normal legalisation chain.
- How do I confirm a translator really holds the credential?
- Ask for the practitioner number and search NAATI’s online directory to see status, language pair and expiry before work starts.
- Which documents typically require NAATI?
- Civil-registry and education documents are the common group — birth certificates, house registrations, marriage certificates, transcripts and degrees — but the final rule is each receiving body’s own notice.
- Do translations expire?
- The translation itself has no built-in expiry, but many receivers limit how recent the underlying certificate must be, which in practice forces a fresh translation.
- If the document is already bilingual, is translation still needed?
- Check whether the English covers every stamp and annotation. If any seal or note appears only in Thai, receivers usually still require a full translation.
- Can this be handled online from overseas?
- Translation and credential checks work remotely, but layers that need a physical seal, such as legalisation, still follow the filing channels the authority publishes.
Official sources
- NAATI — certified practitioner directory
- Department of Consular Affairs — legalisation of translations
Checked on 2026-08-03; confirm with the authority before filing.
Related pages
Ask our team
The exact steps depend on the receiving authority in each case. Contact our team to confirm the checklist and timing.