Demo catalog
Import your collection CSV
Paste a GrailPilot export or a TCGPlayer-style file and see exactly how each row lands before anything is saved. This preview matches against a small demo catalog, so it will not find every card. Signed-in import runs against the full catalog.
Paste your CSV
We read name, set code, collector number and quantity, plus the usual TCGPlayer column aliases.
Review matches
Confident matches, ambiguous rows you resolve yourself, and rows we will not guess at.
Run a match to see how your rows land. Nothing is written to a collection here, and no card is invented when the matcher is unsure.