Product CSV preflight: check a copy before importing (20-row free preview)

Disclosure: I make Onepage48 Catalog CSV Preflight with AI-assisted coding. This post was drafted with AI assistance. It is an existing paid download, not a new feature announcement. For a small shop preparing a product CSV, the general checker finds duplicate SKUs, missing product names, invalid non-negative integer prices/stock, and image-URL syntax warnings. It reads a copy locally and leaves the original unchanged. It does not upload products or connect to a store. Try up to 20 rows free on the linked page before deciding. The Korean/English ZIP is KRW14,900 once and supports up to 1,000 rows, 100 columns and 2 MiB, UTF-8/BOM or explicitly selected CP949, with CSV/TXT findings. No XLSX, automatic repair, URL availability checks, or import-success guarantee. Final tax and total are shown at checkout; custom file review and live English support are not included. I do not have verified customer outcomes to share. Please use the stated scope and free preview to decide whether it fits your file.