About

About CardCenter Pro

A free centering tool, built by a collector, for collectors who want to know before they pay to grade.

9free tools

23articles & guides

0sign-ups needed

Built by a collector in MiamiYour photos never leave your device.

Who's behind it

NadroirTCG

Trading card collector · Miami

I'm NadroirTCG, a Cuban-American trading card collector based in Miami. I started collecting about six months ago, and I share my pulls, the tools I use and the deals I find with other collectors on Instagram, TikTok and YouTube.

When I began looking into grading, I wanted a simple way to answer one question first: is this card's centering good enough to be worth grading? Every similar service I found wanted me to pay or create an account before it would measure a single card. Honestly, that got tiring. It felt like everything was about squeezing money out of collectors who simply love the hobby.

So I built CardCenter Pro, and the NadroirTCG hub alongside it, as free resources for collectors. They will always be free: no paid plans and no account to create.

I haven't sent a card to grading yet. I'm learning the same way you are, and the articles here are the research I've done while getting ready, written down so you don't have to start from zero.

Why it exists

Grading a card costs money and takes weeks, and plenty of collectors have paid to learn that a card was never a 10 candidate because it was cut off-center. Centering is the one grading factor you can measure precisely at home, but doing it with a ruler is slow and imprecise. CardCenter Pro turns a phone photo into an accurate measurement in seconds.

What it does

Measures left/right and top/bottom centering on the front and back of Pokémon and One Piece cards.
Finds the card edges and the printed frame automatically with Auto-align, then lets you fine-tune every line with a loupe.
Compares the result with the published centering tolerances of PSA, BGS and CGC.
Exports a PNG report you can share with buyers or keep with your submission notes.

Private by design

Everything runs inside your browser. Your photos are never uploaded, stored or seen by anyone, and there are no accounts to create. Close the tab and your photo is gone. Read the privacy policy for details.

What it isn't

CardCenter Pro is not a grading company and is not affiliated with PSA, Beckett, CGC or any card publisher. Its results are estimates to help you decide, not grades. Grading companies also judge corners, edges and surface, and they make the final call. See our terms and disclaimer.

How it's funded

The tool is free, and it will stay that way: no paid tier and no sign-up, ever. Three things keep it running:

Ads. They never have access to your photos, because your photos never leave your device.
My Etsy shop, NadshopByNadroir, where I sell printable tools for collectors (see below).
Affiliate links to products I recommend, such as Vault X binders on eBay. If you buy through them I may earn a small commission, at no extra cost to you. They're always labelled.