Can I change my tourist visa to a work permit if I find a job in China?
english.shanghai.gov.cn
Q: I am a British national planning to visit China on an L visa and also planning to explore job opportunities. If I find a job, can I switch my tourist visa to a work permit, or must I leave the country to apply?
A: You may apply to the entry-exit department to change your tourist visa to a work permit, though approval is not guaranteed. For detailed guidance, you can call the 12367 hotline.
Source: Exit-Entry Administration Bureau of Shanghai Public Security Bureau