Short answer
A standard ID or credit-card size card (CR80) is 3.375 x 2.125 inches, and holders are sold to fit it in horizontal or vertical orientation. Buy a holder labeled for CR80 cards in the orientation your card is printed.
What to know
- CR80 is the ISO/IEC 7810 ID-1 card size, the same as a credit card.
- Horizontal holders for landscape cards, vertical for portrait.
- Rigid holders protect cards used daily with readers; soft vinyl is fine for events.
- Slot-punched cards attach with a strap clip, reel or lanyard hook.