This is generally only required for legal translations. A certified translation includes a self-certification, signed and dated by the translator, attesting to the accuracy of the translation and includes the translator’s professional qualifications and credentials. The back of each page of the translation will also be stamped and signed. As a member of the Chartered Institute of Linguists and the Institute of Translation and Interpreting, I am fully qualified to provide certified translations into English.
Find out more in my article A Simple Guide To Certified Translations