How to fix seo variant urls not canonicalized on BigCommerce
Add a canonical tag to every product variant URL pointing back to the base product page, so Google consolidates ranking signals onto one authoritative URL instead of splitting them across hundreds of near-duplicate pages.
Steps for BigCommerce
- BigCommerce natively generates variant URLs like /products/my-shirt?color=Red. As of current platform versions, BigCommerce automatically outputs a canonical tag on product pages pointing to the base product URL — verify this is working.
- In your admin, go to Storefront → Script Manager and check no third-party script is overriding the canonical tag.
- To verify: view the page source of a variant URL (right-click → View Page Source, Ctrl+F for 'canonical') and confirm the href is the base product URL without query parameters.
- If using a Stencil theme, open templates/layout/base.html in the Theme Editor (Storefront → Themes → Advanced → Edit Theme Files) and confirm {{canonicalUrl}} resolves to the base product. If it does not, hardcode it for product templates: in templates/pages/product.html, add <link rel="canonical" href="{{product.url}}"> inside {{#partial "head"}}.
- Check your XML sitemap (yourstore.com/sitemap.xml) to ensure only base product URLs appear, not variant query strings.
<link rel="canonical" href="https://www.example.com/products/base-product-slug">What is seo variant urls not canonicalized?
When a shopper picks a color, size, or other option on a product page, most ecommerce platforms create a new URL — for example, `/products/my-shirt?color=Red` or `/products/my-shirt?size=L`. These variant URLs contain almost identical content to the main product page. A canonical tag is a small HTML snippet you place in the `<head>` of each variant page that says to Google: "The definitive version of this content lives at [base product URL] — please treat that as the real one." It does not redirect shoppers; it only guides search engines.
Without canonical tags on variant URLs, Google sees hundreds or thousands of near-duplicate product pages and must guess which one to rank. This splits your "link equity" (the ranking power earned from backlinks and user signals) across all variants instead of concentrating it on your main product page, pushing every version lower in search results. It also wastes your crawl budget — Googlebot spends time re-crawling colour and size variants instead of discovering new products or categories. Stores with large catalogues (hundreds of products × multiple variants) can lose significant organic traffic this way. Fixing canonicalisation is one of the highest-ROI SEO tasks for any product-rich store.
See the complete Seo variant urls not canonicalized guide for every platform and the full background.
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