free card centering calculator

Check your card’s centering online — free

Upload a photo or flatbed scan of your trading card and SlabWorthie measures the front and back centering, then shows the left/right and top/bottom ratios with a PSA-style centering cap — no sign-up required. It’s a fast estimate from your image, not a professional grade.

1. 1Upload the front — and the back if you can.
2. 2Straighten the card and confirm the inner & outer border lines.
3. 3See your left/right and top/bottom ratios with an estimated grade cap.

Works for Pokémon, sports, Magic, Yu-Gi-Oh! and One Piece cards. New to this? Read how to check card centering and PSA centering standards.