DollarWise

Canonical Tag Checker — Validate Your Canonical URLs Free

October 20, 2026 · 2 min read · By the DollarWise team

A broken canonical tag quietly tells Google to rank the wrong page — or no page at all. Paste your page’s <head> HTML below and this checker validates your canonical: is it present, is there exactly one, is the URL absolute, does it match your page URL, and are there www/http/trailing-slash mismatches. Pure static analysis, right in your browser.

Canonical Tag Checker

Paste your <head> HTML — catch canonical mistakes before Google does.

100% Free Forever No Sign-up No Credit Card Private — files never leave your browser Unlimited Use

1 Your page details

Add this to check the canonical is self-referencing and matches www/http conventions.
Right-click your page → View Source → copy the <head> section (or just the canonical line).

2 Validate

🔗 Canonical report

🎉 Free forever. No sign-up. No credit card. No limits.

Validate as many pages as you like — everything runs in your browser.

How it works

  • Step 1 — Paste your page’s <head> HTML (View Source → copy the head section) and optionally the page’s own URL.
  • Step 2 — Hit Validate Canonical. The tool statically checks for presence, duplicates, relative URLs, typos, HTTPS, www mismatches, and self-reference errors.
  • Step 3 — Apply the 💡 fixes. Re-paste and re-validate after you edit the page.

Everyday uses

  • Site audits — spot-check canonicals across key pages after a redesign or migration.
  • Template debugging — find pages where the CMS emits a homepage or duplicate canonical.
  • SEO learning — see exactly what a correct canonical tag looks like.
  • Client reports — validate canonicals before handing off a site.
  • Migrations — confirm http→https and www→non-www canonicals are consistent.

Frequently asked questions

Can this tool fetch my URL directly? No — browsers block cross-site fetching (CORS), so the tool analyzes HTML you paste instead. That also means your pages stay private.

Should every page have a self-referencing canonical? Yes, in almost all cases. A self-referencing canonical is the safe default; only point elsewhere for genuine duplicates or syndicated originals.

Is a relative canonical URL really a problem? Yes — Google’s documentation requires absolute URLs in canonical tags. Relative ones get ignored or misinterpreted.

Does the tool send my HTML anywhere? No. All analysis happens locally in your browser — nothing is uploaded.

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