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Snap a photo. Get the centering in a minute, before you pay to grade.
The tool
Pokémon · One Piece. Your photos never leave your device.
Tip: shoot straight on, in even light, out of glossy sleeves, on a plain background with a little space around the card.
Each line should sit right on its edge in all 4 corners. Tap a corner to zoom there. Pinch or double-tap the photo to zoom too.
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Pro tips
Lay the card flat and hold your phone right above it. Plain background, even light, no glare.
It finds the card edge and the printed frame, and places all 8 lines for you. Then give them a quick look.
Move your finger slowly and the line moves at 1/4 speed. It stays put when you lift your finger.
Drag a line near an edge and it sticks on it, like a magnet. Keep moving to pull it off.
After Auto-align, any line it is not sure about turns amber or red. Tap Check and it takes you right to it.
Pinch or double-tap the photo to get close to an edge. Drag with one finger to look around.
Tap Check corners to see every corner up close. Each line should sit right on its edge.
Tap a line, then use the arrows to move it one pixel. Made a mistake? Tap undo.
Tap Crop and put the 4 dots on the card's corners. It crops and straightens the photo at full resolution.
Free tools
Every tool is free and works on your phone.
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Guides
For collectors, by collectors
I made these tools to check my own cards before paying to grade them. They're free, and your photos never leave your phone.
Frequently asked questions
No. Everything runs in your browser. Neither your photos nor your reports ever leave your device.
Yes. When a card is ready, give it a name and optional notes (condition, price paid, grading plans), then tap Save to library & scan next card. The report is saved in your browser and the tool clears for the next card. When you're done, Export all as PDF creates one file with a summary page and one page per card, handy for a grading submission. The library stays on your device only; nothing is uploaded.
Each border is measured between its outer and inner guide, then divided by the sum of the two opposite borders. If the left border is 3 mm and the right is 2 mm, the centering is 60/40.
PSA's published standard for a Gem Mint 10 is approximately 55/45 to 60/40 on the front and 75/25 on the back. BGS Black Label requires a 10 in every subgrade, which means essentially perfect 50/50 centering. See our centering standards guide for every grade. Centering is only one criterion: corners, edges and surface count too.
The tool shows percentages to one decimal, but the real accuracy depends on your photo and on where the guides end up, whether Auto-align placed them or you did. Use a sharp, high-resolution image taken straight on, with the phone parallel to the card: angled shots and curved lenses distort the borders. Straighten the card with fine rotation and check each line with the loupe.
Auto-align looks for the sharp change in colour where the card meets the background, and then for the edge of the printed frame. It measures many lines along each side, straightens the card and places the guides, all inside your browser. It works best with a plain background that contrasts with the card and a little space around it. If it can't find the frame with confidence, for example on full-art cards or photos cropped tight to the card, it tells you and waits for you to place the cyan guides instead of guessing. Always check its result with the loupe.
Yes. Drag the guides with your finger. With the loupe on, it appears above your finger while you adjust so you can see exactly where the line falls.
JPG, PNG, WEBP, AVIF, GIF and BMP. iPhone HEIC photos open only in browsers that support them, such as recent versions of Safari; in other browsers, export the photo as JPG first. TIFF and RAW files aren't supported. If a file can't be opened, the tool tells you instead of failing silently.
No. It's a digital estimate to help you decide. The final grade always comes from the grading company.
No. Grading companies also judge corners, edges, surface (scratches, print lines, whitening, dents) and authenticity, and each company applies its own standards and judgment. A card with perfect centering can still receive a low grade. Use CardCenter Pro as one input in your decision, never as the only one.
You are. CardCenter Pro is provided "as is", for informational purposes only, with no warranty of any kind. We are not responsible for grading results, submission fees, purchases, sales or any other decision you make based on its measurements. Use it at your own discretion.
Preparing your report
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Quick tips
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Auto-adjusting and cropping your card. Don't close the page: on some phones this takes up to 30 seconds.
