No, you cannot directly convert a Canadian tourist visa to a work or study visa, as each visa has a specific purpose and cannot be changed. However, suppose you are already in Canada on a visitor visa. In that case, you may be able to apply for a new work permit or study permit from within the country if you meet the specific eligibility requirements for each. For a work permit, you require a valid job offer from a Canadian employer supported by an LMIA, and you must apply from outside Canada. Accepting a Designated Learning Institute (DLI) is needed to get a study permit.