Yes, Official Certified Translations need to be notarized. Notarization is the Best method to demonstrate 2 requirements of certified translations for official use:
(1) Certified translations need to be completed by Humans, professional translators, not machines (AI). Read all about it in our USCIS translation requirements article.
(2) Certified translations for US government use need to be issued by a registered US based translation agency, translations by foreign agencies are generally not accepted, regardless of quality.
Ultra Translate Certified translations include *FREE* USA notarization of the lead team translator/officer’s certification statement and signature to demonstrate those 2 requirements have been met, guaranteeing acceptance as certified translations according to US govt. standards.