Before adding a canonical tag in WordPress, inspect the page’s rendered HTML: your active theme or SEO plugin may already output one. For a normal post or page that genuinely duplicates or substantially overlaps another URL, set the preferred absolute URL in the active SEO plugin’s page-level canonical field. Leave that field at its default when the page should point to itself, then verify the saved output and its related redirects and sitemap entries.
What a canonical tag does—and what it does not do
A canonical link element tells search engines which URL you prefer when duplicate or substantially similar pages are available at different URLs. It is a signal, not a command: Google may select a different canonical based on its own assessment of the pages and other signals. Google’s duplicate URL guidance explains how it evaluates canonicalization.
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Google recommends an absolute URL in a <link rel="canonical"> element in the document head, and recommends that the preferred page point to itself as well. Google’s canonical link guidance covers this method.
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Open the public page in a browser and view its rendered HTML source. Search for
rel="canonical". -
Note the canonical element’s
href, confirm it is in the<head>, and check whether there is more than one. -
Check whether the active SEO plugin or theme is responsible for the output. WordPress themes and customizations can affect SEO-related behavior; WordPress does not guarantee that every site emits the same canonical markup. See WordPress’s search engine optimization documentation.
Do not confuse WordPress core’s redirect_canonical() with an HTML canonical tag. The function corrects certain incoming request URLs based on the site URL; it is redirect behavior, not a <link rel="canonical"> annotation. See the WordPress Developer Reference.
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Choose the preferred URL carefully
Use a canonical override only when the pages are duplicate or substantially similar versions of the same content. Check that the destination loads, uses your preferred HTTPS scheme and hostname, and does not redirect somewhere unexpected. Keep the path and trailing-slash convention consistent with the destination you actually want indexed.
Canonical tags, redirects, and sitemap URLs should reinforce the same preferred URL. Google treats sitemap entries as hints, not definitive instructions, and evaluates them alongside page similarity and other signals. Its guidance on consolidating duplicate URLs describes these different signals.
Set a canonical for a post or page in your existing SEO plugin
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Edit the post or page in WordPress and open the settings for the SEO plugin that is already active.
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Find the plugin’s Advanced settings and its canonical URL field. Yoast documents its canonical controls in its canonical URL guide.
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Leave the field blank or at its default if the page should canonicalize to itself. Enter a different absolute URL only when the page has a real duplicate relationship with that destination. WordPress support guidance also points users to the Yoast SEO box’s Advanced area for a page-level canonical value: WordPress support example.
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Save or update the page, then inspect the public page’s rendered source again.
Avoid installing or activating a second SEO plugin just to add a canonical. Existing plugin and theme output can overlap, so first identify what is already generating the page metadata.
When a plugin hook or theme code makes sense
Use code only when the active plugin’s interface cannot express a needed rule, such as a dynamic canonical for a custom content type. Prefer the SEO plugin’s documented filter or hook API, and make the condition specific to the page type and canonical policy.
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Canonical tag, redirect, or sitemap: choose the right method
| Method | Best suited to | Main caution |
|---|---|---|
| Existing SEO plugin’s page-level control | One post or page needs a deliberate canonical override | Check existing output and avoid overlapping SEO plugins. |
| Plugin or theme hook | Dynamic page types or rules the plugin interface does not expose | Implementation depends on context; use documented hooks and update-safe theme placement. |
| HTTP redirect | A duplicate URL should no longer serve separate content | A redirect changes request behavior; it is not an HTML canonical annotation. |
| Sitemap URL | Keeping preferred URLs consistently represented in a sitemap | A sitemap is a hint, not a guarantee that Google will choose that URL. |
Google supports canonical HTTP headers as well as HTML link elements, but recommends choosing one method rather than using both with potentially conflicting values. A redirect is different again: it changes where a request goes. See Google’s canonicalization guidance and the WordPress reference for redirect_canonical().
Verify the result and troubleshoot a missing tag
After saving, reload the public page and inspect its rendered source. Check each of the following:
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There is exactly one intended canonical annotation, and it appears in the HTML head.
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The
hrefis an absolute URL with the intended scheme, hostname, path, and trailing-slash convention. -
The destination loads without an unexpected redirect.
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Redirect behavior and sitemap URLs do not signal a conflicting destination.
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The page is not marked
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If Yoast does not output a canonical, first check the page’s indexing settings and rendered source. A WordPress support response describes Yoast omitting a canonical for a page marked noindex; this is a support example, not a guarantee about every plugin version or setup. See the support thread.
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