Check 9 / 19 LOW impact In the full checklist
Canonical tags self-referencing everywhere
What this check is
A missing or wrong canonical splits ranking signals between URL variants: with and without parameters, uppercase, trailing slash, paginated views. Self-referencing canonicals keep that tidy.
How to implement it
Ensure every template emits a canonical pointing at its own clean URL, parameter-free and lowercase, and that filtered or sorted collection views canonicalise to the base collection. Verify the canonical matches the URL submitted in the sitemap.
How to verify it
Check the canonical on a product, a collection with filters applied and a paginated view: the first must be self-referencing and the filtered and paginated views must point at the clean base URL.
All 197 checks, one Google Sheet
This page is the summary. The full checklist carries the priority, the impact score and the tool link for every check — all 197 of them, across 14 categories, as a Google Sheet and CSV with lifetime updates.
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