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Canonical Audit Tool
Audit canonical tag implementation across your site. Paste URLs or upload a list to detect missing canonicals, loops, chains, conflicts, and self-canonical failures. Get a compliance score and downloadable fix list.
Input
Up to 50,000 URLs. One URL per line.
Analyzes URL patterns and structure to detect common canonical issues. For live HTTP fetching, a server-side proxy is required (coming soon).
Results
Paste URLs or upload a file to begin.
Why Canonical Tags Matter at Scale
Canonical tags tell search engines which version of a page is the "original." At scale, canonical issues multiply fast: faceted navigation creates parameter variants, pagination generates near-duplicates, and protocol/subdomain mismatches cause splits. A single misconfigured canonical directive can de-index thousands of pages.
Common Violations
- Missing canonical — No canonical tag means search engines guess which URL to index. At 100K+ pages, they often guess wrong.
- Self-canonical failure — Pages should canonicalize to themselves. If a page at /shoes?color=red points to /shoes, it signals the filtered page is a duplicate.
- Canonical chain — Page A canonicalizes to B, B canonicalizes to C. Search engines may ignore the chain entirely.
- Canonical loop — Page A canonicalizes to B, B canonicalizes to A. Both pages lose authority.
- Canonical conflict — HTTP header says one canonical, HTML meta tag says another. Search engines pick one unpredictably.
- Cross-domain canonical — Pointing canonical to a different domain. Usually intentional for syndication, but often misconfigured.
API Access
Access BigDataSEO tools programmatically via the Public API. Generate an API key in your account settings.
curl -H "Authorization: Bearer bds_YOUR_KEY" \ "https://bigdataseo.com/api/v1/riba-calculate?n=500000"
Free tier: 100 requests/day. View full API docs →