You exported a product CSV, edited it in Excel or Google Sheets, and uploaded it to Shopify.
Shopify shows a generic error — or worse, it silently imports the wrong thing: a handle gets
overwritten, a variant attaches to the wrong product, half your rows go missing. You find out
days later from a customer.
Shopify CSV Preflight Validator checks the file before you upload it. It runs locally on your








