Pre-grading
Measure your card's centering before you send it off.
One photo of the front, one of the back: centering to a tenth of a percent and the highest PSA grade it allows.
Why start here
Centering, the one thing you can check for sure at home
It's the only criterion you can measure at home with certainty. For a PSA 10, the front has to stay within 55/45 and the back within 75/25. A card outside those limits won't get above a 9, whatever its condition.
How
Three steps
Lay the card on a matt black background, no flash, 20 to 30 cm away, at 2x or 3x zoom. Photograph the front, then the back. The app finds the edges, measures left and right, top and bottom, and shows the highest PSA grade the centering allows, with a strict grade too.
Also
Corners and edges checked
Whitening on the corners and edges is picked up from the photo. The surface isn't analysed, and the app tells you so: scratches and print defects still need checking under a lamp.
When you sell
Photos that prove it
Download the photos with the percentages drawn on, plus a ready-written listing: “front and back centering within PSA 10 standards”.
Frequently asked questions
Does pre-grading replace PSA?
No. It saves you sending a card that has no chance of getting the grade you're hoping for.
How many free pre-gradings?
5 a month. Unlimited with Pro.
Does it work for PCA, Collect Aura or CGC?
Centering is measured as raw figures, valid for every company. The grade shown follows PSA standards.
Try everything, for free.
Try Pro free for 14 days. No credit card, no commitment.