At Korean checkout you are sometimes offered a choice between paying in won and paying in your own currency. It looks like a convenience and it is a fee. Getting this right saves 3 to 7 percent on every order, which over a year of buying is larger than most shipping savings.
Always choose the local currency
When a Korean site or terminal offers to charge you in USD, that is dynamic currency conversion, and the exchange rate applied is set by the payment processor with a markup typically between 3 and 7 percent. Choosing to be billed in KRW instead means your own card issuer performs the conversion at a rate close to the interbank rate. On a 300 USD order the difference is roughly 9 to 21 USD.
Your card's foreign transaction fee is separate
Many US cards add a foreign transaction fee of about 3 percent on top of the conversion. Cards with no foreign transaction fee are common and free, and for anyone importing regularly, switching to one is the single highest-return change available. Paying 3 percent on 3,000 USD of annual purchases is 90 dollars for nothing.
Where the exchange rate actually gets set
The rate is applied on the settlement date, not the order date, which for pre-orders can be weeks later. Rate movements of 2 to 4 percent over a month are ordinary. This is not something to try to time, but it does mean the final charge on a pre-order will rarely match the estimate you saw at checkout.
Watching the rate for large purchases
The won to dollar rate has moved in a broad band over recent years, and a 5 percent swing on a 2,000 USD order is 100 dollars. For a large planned purchase, glancing at the rate and moving the order by a week is occasionally worth it. For ordinary purchases it is noise and not worth thinking about.
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Start a buy-for-me order →Frequently asked
What if the site only shows dollars?
Some international-facing Korean sites price in USD natively rather than converting, which is not the same thing and carries no conversion markup. The fee applies when a KRW price is converted for you at checkout.
Does this apply to services and shipping fees too?
Yes, every KRW-denominated charge. Shipping fees quoted in won and converted at payment are subject to the same markup.
Are debit cards worse than credit cards?
Often yes, with higher foreign transaction fees and less favorable handling of holds. A no-foreign-fee credit card is generally the better instrument for international purchases.