What is Shopify variant URL?
A URL Shopify generates for each product variant (e.g., ?variant=12345 for size or color). Without a canonical tag, these URLs are indexed as separate competing pages, splitting ranking authority across variants of the same product.
The fix is a one-line theme edit: adding a canonical link tag in theme.liquid that points all variant URLs back to the parent product URL. This consolidates ranking signals into a single strong page instead of several weak ones.
How this shows up in your audit
Your Growth Blueprint diagnoses the store-specific issues generic SEO tools miss — variant URL indexing, collection page optimization, product title cannibalization — with fixes written for your exact platform.