Most online casinos in Greenland won't charge you any additional fees on deposits or withdrawals when using Skrill. However, depending on the payment gateway used, or the amount you deposit with Skrill, certain fees may apply. A good way to check if fees apply is to read the casino's terms and conditions.
Skrill itself also charges a transaction fee of 2.9 percent (minimum EUR/USD 0.29). The exact amount and any applicable fees will be available upon completion of the transaction.