Free Card Centering Calculator
Take or upload a card photo. We automatically detect its borders, straighten the card, and measure its centering. You can fine-tune every guide yourself.
Upload your card image
Drag and drop your card image here, or click to select
Photos stay on your device. Detection runs in your browser.
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Info & Scanning Tips
Understanding Card Centering
Card centering refers to how well the image and borders of a trading card are aligned with the edges of the card stock. It's typically measured as a ratio or percentage.
For example, 60/40 centering means one border is 60% of the total border space, and the opposite border is 40%. Perfect centering is 50/50.
Centering is a key factor in determining a card's grade. Higher grades (like PSA 10 Gem Mint or BGS 10 Pristine) require near-perfect centering, although the exact standards vary by grading company.
Tips for Better Scanning
Card Placement
Place the card flat on a clean, contrasting background (e.g., black felt or dark paper). Ensure the entire card, including all borders and corners, is visible in the scan.
Lighting
Use bright, even, and indirect lighting. Avoid direct overhead lights or sunlight which can cause glare or harsh shadows. A well-lit room or a light box is ideal.
Card Protection
For best results, scan the card raw (outside of any sleeve or slab). If scanning in a sleeve, use a new, clean, tight-fitting penny sleeve to minimize glare and distortion. Avoid scanning in top loaders or graded slabs if possible, as the extra plastic layers can interfere with detection.
Avoid Tilt / Angle
Hold your phone directly above the card, parallel to the surface. Scanning at an angle (tilting the phone) will distort the card's perspective and lead to inaccurate centering measurements.