What is a canonical tag?
Working on promotionwebsiteonline, it's useful to know that there are tags that directly impact search engine optimization results. We've previously written aboutbasic tags, affecting SEO. Today we'll talk about the canonical tag and its impact on a website's search rankings.
The canonical tag informs search engines of the priority of a particular page over others. Using this tag helps eliminate duplicate content issues across multiple URLs and tells search engines which page to display in search results. The canonical tag is inserted into the URLs of all other pages, displaying the primary URL as the canonical link.
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What is the problem with duplicate content?
Duplicate content is content that appears on more than one page. Technically, duplicate content isn't a problem; search engines don't penalize it. However, identical information hosted on different URLs can cause confusion when selecting relevant content for search results. Irrelevant duplicate pages can rank for keywords, creating confusion. First, search engines are simply overwhelmed when faced with choosing one from several URLs with identical or similar content. Second, while search engines are crawling multiple pages with duplicate content, they may miss pages with unique content. And third, large amounts of duplicate content negatively impact rankings. Search robots may choose to display irrelevant duplicates. Canonicalization helps avoid these problems and positively impacts search traffic.
Why do duplicate pages appear?
It may seem that if you createunique content, then issues of duplication and canonicalization don't apply to you. This isn't true. The fact is that search engines evaluate website pages differently than we do. For them, each unique address is a separate page. Let's take the following addresses as an example:
They all lead to the same page. But for search engines, each of these addresses is unique. And there can be many such variations, includingmobile versionpages.
Content management systems and dynamic code-driven websites can unwittingly create problems. They can automatically generate tags, specify different paths and URLs for navigation to the same content, and add URL parameters for searching and sorting products or content. As a result, hundreds of duplicate URLs can appear without your knowledge. We've already discussed the potential consequences of this.
How to work with canonical tags?
When working with canonical tags, there are some important points to keep in mind:
1. Linking a page to itself
This option is used when the canonical tag points to the current version of the page. That is, if the content on pages 1, 2, and 3 is duplicated, and 1 is the canonical version, you can place a canonical tag pointing to page 1 in the URL of page 1.
2. Canonicalization of the home page
As we mentioned above, duplicate pages can proliferate regardless of your wishes. And people can link to your site's pages in different ways. This is uncontrollable. Therefore, it makes sense to place a canonical tag in your homepage template.
3. Checking dynamic canonical tags
Sometimes, poorly written code can cause a site to generate canonical tags for each page version. Therefore, it's important to check page URLs, especially for e-commerce sites and when working with content management systems.
4. Avoiding conflicting information
If the information on pages isn't consistent, confusion will arise. For example, page 1 links to page 2, and page 2 links to page 1. There should be one canonical page to which all links point. It's also not recommended to chain canonical tags together (1-2, 2-3, 3-4) if you can avoid it. Properly written information guarantees the desired result.
5. Canonicalization of similar pages
A canonical tag can be used not only for completely identical pages but also for pages with very similar content. For example, when a page differs only in currency, localization, or product availability. Keep in mind that non-canonical versions of a page may not rank. If the pages are too different, search engines may ignore the tag.
6. Canonicalization of duplicates with different domains
If you manage multiple websites, you can use a canonical tag for different ones.domainsFor example, if your business involves publishing the same content on various resources to promote your products, using a canonical tag will focus rankings on one selected site and prevent others from ranking.
Canonical tag and 301 redirect
When using a canonical tag, a reasonable question arises: is link weight transferred anddomain authorityto the canonical site and how the canonical tag differs from using a 301 redirect. Yes, using the canonical tag combines the link values of all addresses, and the canonical page's search engine ranking increases, as does search traffic. But this issue is still worth keeping under control.
Regarding 301 redirects, the results differ for both search engines and users. When using a 301 redirect from page 1 to page 2, the user is automatically redirected to page 2 without seeing page 1. When using a canonical tag from page 1 to page 2, search engines see page 2 as the canonical one, but users can still access both pages.
How to check canonical tags for SEO?
To effectively use any tool, and canonical tags are no exception, it's essential to monitor the process and the results. For canonical tags, consider the following factors:
- The presence of a canonical tag on the page;
- Does it lead to the correct page?
- Are the pages open for crawling and indexing?
It's not uncommon for a canonical tag to point to an address that's either blocked by robots.txt or has the "noindex" value. This is precisely the kind of conflicting information that confuses search engines. We wrote about this above.
To check canonical tags, you can use the simplest method – viewing. To do this, in the browser with the website page open, right-click and select “view page source”.
And use the text search – Ctrl+F – to find the desired tag. If present, it will look like this:
You can also use specialized tools offered by various developers. Most of them allow you to conduct a mass audit of canonical tags.
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