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Non Canonical URL Data

Non-Canonical URL

Non-Canonical URL
Simple Definition
Values Returned
Non-Canonical URL in More Detail:
Examples of How Canonical URL Data is Used
- Example 1: Is a Page Non-Canonical?
- Example 2: Duplicate Pages
- Example 3: Missing Canonical Tags
Related Content
Benefits of Our Data


Non-Canonical URL

Non-canonical URLs are pages that are either a canonical duplicate of another URL or a duplicate piece of content. These can be legitimately non-canonical pages, but we only find pages by following links.

That means these URLs are being linked to from pages on your site. It also means they are accessible, which is only possible if they are not handled with redirects properly.

There are also legitimate reasons a large swath of pages are all canonised to one or a few pages. PPC (SEM) landing pages or dedicated landing pages for any channel may be built and canonicalized to a single page.

Our data allows you to check that and help provide insights that could direct a digital strategy.


Simple Definition

HTML pages with a canonical tag URL that links to another page / URL.


Values Returned

The possible values returned in this column are as follows:

False = If the URL and the canonical URL do not match due to canonical differences

True = If the canonical URL does not match the URL of the page

Missing = There is no canonical tag on the page

Error = The canonical tag is incorrectly implemented on the page

Non-Canonical URL in More Detail:

If the URL of the page crawled and the canonical URL do not match, then Raptor flags this as a non-canonical page.

The page must meet the following criteria to be determined / defined as a non-canonical page:

  • HTML/Text
  • Accessible
  • Return a ‘200’ status code
  • Linked to at least once
  • Contain a canonical tag this is not self-referential

File types such as CSS or Images will shows as blank fields as they do not contain a canonical tag.


Examples of How Canonical URL Data is Used

All the data our web scraper extracts is used in various ways by SEOs or web devs. We provide some examples of how Canonical URL data can be used in different ways below:


Example 1: Is a Page Non-Canonical?

You can determine which pages are non-canonical based on whether the Canonical URL matches the URL of the page. If they don’t match, the page is non-canonical, often these pages are not the focus of an SEO assessment or audit.


Example 2: Duplicate Pages

You can use the data we provide here to identify pages that are legitimate canonical duplicates of other pages. These pages can often be excluded from any analysis as they are non-canonical and hence do not require optimising in the same way as canonical pages.


Example 3: Missing Canonical Tags

A standard SEO check you can do with this data; is ensuring that every page that has a canonical tag, and that it is implemented correctly on page.


Related Content

The list of guides below might be useful if you are analysing this data and want to know more about it:

Related column headers in Raptor website crawler reports:


Benefits of Our Data

Any identified group of pages that are marked as anything other than ‘blank’ or ‘canonical page’ could be worth investigation. Conversely you can remove large groups of pages quickly from your analysis under certain circumstances.

  • Identify non-canonical pages
  • Identify canonical pages
  • Identify page missing canonical tags
  • Identify pages with canonical errors


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