MPN Format Validator
Bulk-validate Manufacturer Part Numbers against common format rules, length, character set, brand-pattern matching.
About this tool
MPN is required for many GMC products lacking a GTIN. Wrong format = silent disapproval. This validator catches common issues: too short, includes spaces or special characters, doesn't match the brand's known pattern (when configured).
When MPN matters
Google Merchant Centre requires either GTIN or MPN+brand for branded products. MPN is the fallback when you don't have a GTIN — particularly common for private-label, custom-print, and handmade products. Spaces, special characters and bare numeric strings all trigger disapproval.
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