Drag in supplier files — CSV, Excel, or a whole zip. The engine fingerprints, normalizes, validates, and holds anything it can't prove, with the reason spelled out. Optionally add your current stock export to see exactly what's new and what changed.
In the Shopify app this screen ends in one button — “Sync to store” — with preview, snapshots and one-click Undo. Here in the standalone tool, you take the clean file with you.