Website Canonical Checker
Audit canonical tags across a set of pages. Paste up to 20 URLs and the checker fetches them in parallel, reads the canonical from the HTML and from the HTTP Link header, and reports for each page whether the canonical is missing, self-referencing or points to another URL – and what is wrong: several canonical tags, HTML and header disagreeing, http instead of https, a canonical target that redirects or returns an error, or noindex combined with a canonical to another page.
- Encrypted connection
- No sign-up
- Free to use
How to use Website Canonical Checker
- Paste up to 20 URLs.
- Click “Check canonicals”.
- Read the result per page.
- Fix the pages with warnings.
Website Canonical Checker features
Bulk
20 pages in one go.
HTML and header
Both sources compared.
Target check
Redirects and errors.
Conflict detection
noindex, duplicates, http.
Safe fetching
Public addresses only, with size and time limits.
Redirects followed
Final URL shown.
When to use Website Canonical Checker
- Checking templates after a release.
- Auditing filtered or paginated URLs.
- Verifying a migration.
- Mobile vs desktop URL checks.
Website Canonical Checker FAQ
Should every page have a canonical?
A self-referencing canonical on every indexable page is a good default.
Why is noindex with a canonical a conflict?
noindex says “drop this page”, the canonical says “this page equals that one”; search engines may drop the target too.
Can the canonical be a redirect?
It should point to the final URL that answers 200.
How is this different from the URL Canonical Checker?
That tool explains one page in depth; this one checks many pages at once.
Canonicals at scale
Template mistakes affect many pages at once: a canonical that always points to the home page, or one that keeps tracking parameters. Checking a sample of page types catches these quickly.
Keep internal links, sitemaps and canonicals pointing to the same URLs.
How it works: our server downloads the page once through a guarded fetcher that only connects to public addresses, follows a limited number of redirects and stops after a size and time limit. The HTML is then analysed in your browser as inert text – scripts on the page never run and nothing is stored.
What it cannot see: content and resources that a page adds with JavaScript after it loads, pages behind a login, and servers that block automated requests. For those, open the page in your browser, use its developer tools, or paste the page source where the tool offers a paste option.
Use the results as a starting point: fix the items marked red first, review the yellow warnings in context, and run the check again after a change. Requests are rate-limited to keep the service fair; if you check many pages in a row, wait a few minutes.
Related checks on this site cover the rest of a technical review – speed and Core Web Vitals, security headers, structured data, accessibility and SEO signals – so you can work through a whole site audit one topic at a time.
Who it is for: site owners checking their own pages, developers debugging a release, SEO and marketing teams auditing clients or competitors, and students learning how the web works. No account or installation is needed, and the results are plain text and tables you can copy into a report or ticket.