Moving to Singapore? Ask our regular expats in Singapore questions on relocation and their experience here. Ask about banking, employment pass, insurance, visa, work permit, citizenship or immigration issues.
Your subject says official. How 'official' is the document? If it is issued by the Chinese government, go to their embassy. Depending on what you need it for, Singapore may not accept a foreign government document translated without that government's certification.
Depends on your purpose for this translated documents.
If it is for official matters like immigration, go to the requesting authority's list of appointed translators. They will have to stamp your translated documents with their official stamp to prove that they are the appointed translators by the said authority.
If it is just a regular document, Greenbook has hundreds of translators.