Canonical Tag Checker
Compare a page URL and canonical URL to spot self, cross-domain, mismatched, and parameterized canonical signals.
Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint. TOOLGRID measures tool usage, not the content you enter.
- No TOOLGRID input upload
- No account
- Review before copy
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What this tool does
Free canonical checker and canonical URL checker for planned metadata. Compare the page URL and canonical URL you enter, review host/path/query differences, identify self-canonical and cross-domain cases, and generate the exact link tag snippet to publish.
Use this canonical tag checker when you are auditing a page template or preparing metadata before release. Enter the page URL and the canonical URL you intend to publish; the canonical checker compares protocol, host, path, query, and hash signals locally.
The checker highlights whether the result is a self-canonical, same-domain canonical, cross-domain canonical, or likely mismatch. It also generates the <link rel="canonical" ...> snippet so engineering or CMS teams can copy the intended tag exactly.
When you already have page source, paste the HTML head or a HTTP Link header to inspect the canonical tag locally. The tool detects missing, multiple, relative, invalid, cross-domain, query-string, and hash-fragment canonical risks without fetching the live page.
This tool does not crawl or fetch a live page. It works as a local canonical URL checker for the URLs, HTML, or headers you provide and helps catch common mistakes before deployment: canonicalizing filtered pages to the wrong path, dropping required locale prefixes, keeping tracking parameters, or accidentally pointing staging pages at production.
For a full SEO preflight, pair it with Hreflang Generator for alternate-language annotations and URL Parser to inspect query parameters before deciding what should stay canonical.
Where this tool earns its place
Check whether a generated canonical points to the clean route you expect before a CMS, ecommerce, or documentation template ships to production.
Compare a filtered, sorted, or UTM-tagged page URL against the clean canonical destination so duplicate URLs consolidate correctly.
Paste a page head, full HTML document, or HTTP Link header and catch missing, multiple, relative, or parameterized canonical output before release.
What to check before relying on the result
- Performance and maximum practical input size depend on browser memory, device speed, and the structure of the input.
- Review the generated result before replacing or publishing an original file.
Open a nearby browser tool when you need to validate, convert, or reuse the result.
How to use
01Use Cases
Check whether a generated canonical points to the clean route you expect before a CMS, ecommerce, or documentation template ships to production.
Compare a filtered, sorted, or UTM-tagged page URL against the clean canonical destination so duplicate URLs consolidate correctly.
Paste a page head, full HTML document, or HTTP Link header and catch missing, multiple, relative, or parameterized canonical output before release.
When syndicated or mirrored content should consolidate to another domain, verify the target host and path before copying the canonical link tag.
Tips & Tricks
- 01Canonical and hreflang should agree
For localized pages, each alternate should usually canonicalize to itself, not to a different-language page, or Google may ignore the alternate set.
- 02Keep fragments out of canonical URLs
URL fragments after # are not sent to the server and should not define canonical page identity for search engines.
FAQ
02Does this fetch a live page?
No. It checks entered URLs, pasted HTML, pasted head markup, or pasted Link headers locally. It does not fetch live pages. Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint. Browser-local processing avoids a TOOLGRID upload path, but it is not a blanket security guarantee.
What is a self-canonical?
A self-canonical is when a page declares itself as its own canonical, signaling that it is the preferred version of that URL.
When would a cross-domain canonical be used?
When content appears on multiple domains and you want search engines to consolidate authority on one preferred version.
Should a canonical URL include UTM parameters?
Usually no. Campaign parameters normally create duplicate URL variants, so the canonical should point to the clean indexable page unless your SEO policy says otherwise.
Can this verify the tag on a live website?
It can inspect source that you paste from a live page, but it does not request the page itself. Use your browser inspector, crawler, or Search Console URL inspection to confirm what a live page actually publishes.