How to Fix: Duplicate Product ID (SKU)
Multiple products share the exact same 'id' / SKU attribute.
Live Single-Item Fixer
Paste a single SKU value below to test and preview the auto-fixed GMC format in real-time.
Live Rule Checker & Fixer
Instant test for Duplicate Product ID (SKU)
Issue Root Cause and Repercussions
Variant feeds exporting the parent product ID instead of variant ID, or merging multiple catalogs with overlapping SKUs.
GMC only stores one product per unique ID. Subsequent items will silently overwrite earlier ones or trigger duplicate ID errors.
Step-by-Step Resolution Guide
Export your current raw product catalog from your e-commerce store (Shopify Admin > Products > Export or WooCommerce feed plugin).
Ensure every SKU, variant, size, and color combination has a distinct, permanent alphanumeric identifier.
Appends unique variant suffixes (-v2, -v3) to disambiguate IDs.
Have a full product feed with this error?
Upload your CSV or XML feed to auto-clean all affected SKUs at once.
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