What is the best credit card for international transfer?

Best Credit Cards For International Travel

Chase Sapphire Preferred? Card: Best Credit Card for International Travel Benefits.
Capital One Venture X Rewards Credit Card: Best Credit Card for International Travel With the Most Transfer Partners.

Does my credit card automatically convert currency?

The currency conversion will be handled automatically by your credit card network using their exchange rate. To add insult to injury, you may still end up getting charged a foreign exchange fee even if you use dynamic currency conversion and the transaction is performed in USD.