The industry standard trading card measures 2.5 × 3.5 inches (63.5 × 88.9 mm). This format has been the gold standard since Topps established it and remains universal across:
- Topps — baseball, football, hockey cards
- Panini — basketball, soccer, football cards
- Upper Deck — hockey, baseball cards
- Pokémon & Magic: The Gathering — TCG cards
CardStar prints all cards at exactly this size, ensuring compatibility with standard sleeves, top loaders, and display cases.