Your file stays in your browser

Catalog Precheck reads and checks the CSV in the current tab. The product file is not uploaded for validation.

Choose file

You select a CSV on your device.

Browser memory

The current tab reads the file locally.

Web Worker

Rules run away from the page interface.

Results and downloads

Reports and corrected copies are generated locally.

Clear when finished

Clear file removes the current working copy and results from this tab. Refreshing the page does the same. Neither action deletes your original file.

What a local scan cannot know

It cannot inspect existing products, collections, store settings, remote image availability, or the exact result of a future Shopify import.

No detectable issues does not guarantee import success. Review the report and your store settings before importing.