Canonical Issue Checker Calculator

Canonical Issue Checker

Enter one URL per line. Optionally add an expected canonical after a tab, or a comma before the expected URL.

URLs to Check https://example.com/ https://example.com/about https://example.com/page?ref=ads

Tip: Use https://page,https://expected-canonical or https://page[TAB]https://expected.

Max URLs

Timeout (seconds)

Max Redirects

User Agent

Follow redirects to final URL

Verify canonical target status

Strip query parameters for comparison

Ignore trailing slash differences

Treat www and non-www as same

Allow cross-domain canonicals

Check Canonical Issues Reset

Example Data Table

These sample rows show typical output fields and issue notes.

Formula Used

This checker converts canonical signals into a weighted health score.

• Issue Severity: sum of weights for each detected issue, capped at 100.
• Health Score: 100 − Severity, floored at 0.
• Site Score: average of page health scores across checked URLs.
• Labels: OK (0), Minor (1–20), Warning (21–50), Critical (51–100).

Tip: Adjust comparison options to match your canonical policy, then rerun the checks.

How to Use This Calculator

1. Paste URLs, one per line, into the input box.
2. Optionally add an expected canonical after a tab or comma.
3. Choose redirect and comparison options that match your site rules.
4. Run the check and review scores, labels, and issue notes.
5. Export CSV or PDF to share fixes with your team.

FAQs

1) What is a canonical tag?

It is a link element that signals the preferred URL version of a page. It helps consolidate signals across duplicates, tracking URLs, and similar pages.

2) Why do canonical mismatches matter?

A mismatch can indicate duplication, redirect confusion, or policy drift. Search engines may ignore conflicting canonicals, which can weaken consolidation and slow indexing decisions.

3) Should every page have a canonical?

Most indexable pages should. Some sites rely on consistent internal linking and redirects, but a clear canonical reduces ambiguity for parameterized or near-duplicate URLs.

4) What does “canonical target redirects” mean?

It means the canonical URL itself forwards elsewhere. Point canonicals directly to the final 200 URL to avoid chains and reduce mixed signals.

5) How does “strip query parameters” help?

It compares URLs without tracking strings like utm parameters. That helps you confirm whether canonicals correctly consolidate parameterized versions into a clean preferred URL.

6) Can cross-domain canonicals be valid?

Yes, for syndicated content or migrations, but they are easy to misconfigure. Keep the option off unless you intentionally canonicalize to another domain.

7) What if a page is noindex?

Noindex pages can still have canonicals, but the directive may override indexing. The tool flags noindex so you can confirm the page is intentionally excluded.

8) Why does the score cap severity at 100?

Capping prevents extreme totals from hiding comparative differences across pages. It also keeps the score scale consistent when multiple issues stack on one URL.