The official currency of Cannes is the euro, similar to the rest of France. ATMs are located around the city, and you can also find currency exchange offices in the city center, particularly near transportation hubs. 

Tipping in France is not obligatory, but many people do so for excellent service. If you do tip, 10% of the total bill is generally considered to be more than enough of a tip to show your appreciation, though it’s rare to leave more than a 20 euro note. Many restaurants include a service charge, but this may or may not go to the server, so it’s common to leave extra cash on the table for the server (as opposed to adding it to a credit card payment method). Many people also tip a couple euros to taxi drivers, or 10% of the fare if it’s a longer ride.