By first converting your USD to Euros at Bitstamp before making a withdrawal, you can save considerably on withdrawal costs. When withdrawing USD to a European account, you pay a $25 fee. While the fee for a withdrawal of Euros to a European account is only $3.00
Converting USD to Euros at Bitstamp works as follows
Log in to your bitstamp account
Switch to “Pro” interface
Go to “Trade” via the menu at the top of the screen
Then switch to the EUR/USD market by going to the correct market at the top left of the screen
Optional:
If you have sub-accounts with Bitstamp, first choose the account you want to trade in.
Choose buy (EUR), choose Market, fill in the amount USD to sell or use slider to select percentage of USD to sell. You can sell max 90% in one order.
As soon as you click on the green Buy button, the USD will be converted into Euros.
If you want to sell all USD, create multiple market orders with each max 90% until you have left less than $10 (which is below min order size).
If you want to transfer the euros to your own bank account, choose
Withdraw -> Cash Withdrawal -> Choose Euro and select your SEPA bank account.