Tutorials: How to import or sweep a private key from a paper wallet
Remember! If you import from the paper wallet to a software wallet the balance will be available on both.
If someone gets hold of your paper wallet you can still loose your funds on the software walllet.
The safest method is to SWEEP your private key, basically its sending a transaction to yourself. After the sweep is complete, the paper wallet is completely depleted of funds and all of the private key’s cloaks now belong to a new private key in the software wallet. You do this by:
importprivkey YourPaperWalletPrivateKey "OPTIONAL LABEL"