A credit card protector with account log includes an envelope of sheet material forming a sleeve for protecting a credit or debit card. A pre-printed grid defines a writing area on a surface of the envelope. A user writes transaction information on the envelope when using the card. The envelope may receive the card from the top, side, or corner. The envelope may be partially or completely transparent or translucent. Grid lines or graphics may be printed on an interior or exterior surface of the envelope and visible through a translucent portion thereof. The envelope may be partly or completely formed of a stiffened or reinforced material such as cardboard. The envelope may be partly or completely formed of a print-retaining material. The envelope may be partly or completely formed of an ink-retaining or graphite-retaining material.