To enter Canada is a copy of birth certificate fine?

No, a copy of a birth certificate is not sufficient to enter Canada. To enter Canada, you will need a valid passport from your country of citizenship. If you are a citizen of a country that is not visa-exempt, you will also need a valid visa. In some cases, you may also need to have a medical examination or provide other documentation. Be sure to check with the Canadian government for the specific entry requirements for your situation.