I built a browser-based preflight tool that checks Shopify product CSV files before import. It flags duplicate SKUs and handles, missing required values, invalid prices, unsupported availability values and broken image URLs.
The workflow is privacy-friendly: analysis runs in the browser, with no store credentials and no file upload to a server. Results include row-level issues and practical next steps.
Result: merchants can catch catalog problems before a failed import and start with a small, low-risk CSV review before scaling to a larger cleanup.