[header] How to freeze a credit card [title] Place the card in a freezer-safe container. [step] You may want to use a plastic storage bag, a piece of tupperware, or even a cup. Choose an item that will either cover up your credit card number or is thick enough that the number will not be visible through the ice. 
[substeps] If the number is visible through the ice, then you may be tempted to use the card number for online shopping. You could also cover the number with a paper towel or a small rag before freezing, but remember that it will be submerged in water.