Certified and NAATI translations are performed by accredited professional translators, and both are valid globally , the main difference lies in the type of certification of each translator.  

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The  Certified translators are professionals recognized by the Ministry of Justice and other related entities in their country of origin.  

NAATI translators are translators accredited by the NAATI (National Accreditation Authority for Translators and Interpreters) in Australia.

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The most important thing to keep in mind is what type of translation you are requesting. If they don't explicitly ask for a NAATI translation, you can use a certified translation.

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Other translations  They are made by certified professional translators, but they are delivered without signature and without seal (in word). These types of translations are useful for resumes, business plans, essays, web pages, etc.