Free Pokemon Card Centering Tool Online

MintPick is a free, browser-based tool that measures Pokemon TCG card centering from any photo — including tilted phone shots, eBay listing images, and card-show pics. Open it in any browser and start measuring — no download, no account needed for your first card. Paste or upload a photo; MintPick straightens it (perspective correction), detects the four corners, and returns the left/right and top/bottom ratios the grading companies use.

Start measuring — free →

What this tool actually does

• Straightens a tilted photo before measuring (perspective correction)
• Finds the four corners of the card with an ML detector
• Returns centering ratios: left/right and top/bottom
• Gives a PSA-style quality score for pre-grading decisions
• Lets you save copies to a Board and compare them side by side in a Stack

Free and unlimited on the measurement itself. The paid tier adds comparison workflow and storage — more on the split below.

Why most centering calculators break on real-world photos

Traditional card centering calculators ask you to type in pixel measurements from a perfectly scanned card. That assumes two things that almost never hold in practice:

1. You already have the card in hand. So you can't pre-grade an eBay listing before you bid.
2. Your photo is shot perfectly straight overhead. Phone shots, show photos, and especially listing images are almost always at a slight angle.

MintPick corrects perspective first. You take a picture at whatever angle — the tool un-tilts the card, then measures on the corrected image. That is why you can point it at an eBay seller's listing photo and get a usable ratio back, instead of a number that's off by 10 percentage points because the photo was taken from two inches off-axis.

If you've ever squinted at a listing photo trying to decide "is this centered enough to be worth $200?" — that's the gap MintPick was built to close.

How to measure card centering with MintPick

1. Open Scan. No sign-up for your first card.
2. Upload a photo. Drag a file, paste from clipboard, or snap one with your phone or laptop camera.
3. Wait for corner detection. The card's four corners are auto-detected and the image is straightened.
4. Adjust corners if needed. Drag any of the four corners to fine-tune. Zoom up to 8x.
5. Read the centering. You get left/right and top/bottom ratios, plus a PSA-style quality score.

To compare multiple copies of the same card — the workflow serious buyers run before spending real money — save each scan to a Stack and view them side by side.

MintPick vs other centering tools

| Tool | Free tier | Tilted / eBay photos | Multi-card compare | Platform | |---|---|---|---|---| | MintPick | Unlimited scans | Yes (auto perspective correction) | Yes (Stack, Pro) | Web (use instantly in any browser) | | Card Centering Calculator | Paid ($4.99) | No | No | iOS / Android | | CardGrading.app | 1 scan, then paywall | Partial | No | Web | | PriceCharting centering | Bundled with pricing tool | No dedicated UX | No | Web |

The combination that makes MintPick different is not one feature; it's perspective correction + multi-copy comparison. The first lets you use it on photos you didn't take yourself. The second matches the workflow flippers actually run — you rarely evaluate a single copy in isolation; you're almost always picking one out of three or four.

What's free, what's Pro

Measurement itself is free — the accuracy and the features that produce the numbers are not paywalled. Free users get:

• Unlimited scans (front and back)
• Full perspective correction
• Full centering ratios and quality score
• 4x and 8x zoom
• Export (with a small MintPick watermark)
• Board save for up to 10 cards

Pro ($9.99/month or $89.99/year, 25% off annual) adds the comparison and archival workflow:

• Stack — multi-card side-by-side comparison
• Paste from clipboard (drop a copied eBay image straight in)
• Re-edit a saved scan
• Unlimited Board size (keep your full buying history)
• No export watermark

The Pro value is not measurement accuracy — the ML model is the same on both tiers. It's the workflow around the measurement: comparing copies quickly, keeping a searchable history, and pasting listing images in one keystroke. If you only check centering once in a while, Free is enough. If you're evaluating multiple copies every week, Pro is what makes the habit stick.

Who this is for

• Serious buyers comparing multiple copies of the same card before bidding or buying — on eBay, Whatnot, Mercari, or at a show.
• PSA / BGS / CGC submitters pre-screening their stack to avoid a $20 submission on a card that was never going to grade.
• Sellers checking centering on a card they already own so they can list it honestly and price it right.
• New collectors trying to understand what PSA's 55/45 centering rule actually looks like on a real card.
• Flippers and resellers running the same card through many listings every week.

MintPick is deliberately not a "we'll tell you the grade" tool. It's a decision-support tool — it helps you narrow the field. Your eyes and your budget pick the winner.

Try it

Start measuring — free →

No account needed for your first card. If it saves you from one bad grading submission, it has paid for itself.

If you run into a card where MintPick struggles, email support@mintpick.dev with the photo — bad cases are what makes the model better.