Guides
Product-data quality, practically.
Short guides on the problems the free tool looks for. Examples are fictional or use public barcode examples.
How to check whether a barcode (GTIN) is valid
The check-digit rule, worked by hand, with two valid examples.
Catching wrong weights and dimensions in a product CSV
Units, zero values, default weights and weight that does not fit size.
When a product title contradicts its specs
Sizes and pack counts that disagree between title and columns.