The canonical tag is an important HTML element in SEO that is used to avoid duplicate content issues across web pages. The correct use of canonical tags helps search engines understand which version of a page is the original or preferred when multiple pages have similar or identical content. By implementing a canonical tag, you can effectively control how search engine crawlers index your pages and ensure that they do not perceive them as duplicates, which can hinder your page’s ranking in search results.
What is a Canonical Tag?
A canonical tag is an HTML code that is inserted into <head> section of a web page. It typically looks like this:
<link rel=”canonical” href=”https://www.ditwebsite.com/page-url/” />
This code tells search engines that the specified URL is the preferred version of a page. If you have multiple pages with the same content but different URLs (for example, because of parameters in the URLs), the canonical tag helps indicate which page should be prioritized for search engine indexing.
Why are Canonical Tags important?
Canonical tags are essential for solving duplicate content issues, which can occur for several reasons:
Dynamic URLs
Many webshops, but also normal pages, have multiple URLs for the same product due to sorting options, filtering or categories. Without a correct canonical tag, you risk search engines crawling and indexing these duplicates, which can confuse them about which page is most important.
By specifying the correct version with a canonical tag, you can protect your SEO from being negatively affected by these duplicates. Search engines like Google will only index the “canonical” version of a page, meaning you won’t lose any SEO value on those pages.
When should you use Canonical Tags?
If you have pages with identical content but different URLs (e.g. due to multiple categories or sorting functions), you should use a canonical tag to avoid these pages competing against each other in search results.
To get the most out of canonical tags, there are several important points you need to follow:
Always choose one canonical version: It is crucial to have only one version of a page as the canonical one. If multiple versions of a page mark themselves as canonical, it can create confusion for search engines.
Self-referencing canonicals: Even if a page doesn’t have duplicate content, it’s still a good practice to include a self-referencing canonical tag. This ensures that search engines don’t make errors if similar versions of the page arise later.
Proper implementation of hreflang and canonical: If you have international versions of your page, combine hreflang tags with your canonical tags to ensure proper geotargeting and avoid duplicate content across language versions of the page.
Consequences of missing Canonical Tag
If you fail to implement canonical tags correctly, you risk being penalized by search engines for duplicate content. This can result in:
Lower search rankings: Search engines can get confused about which version of your page to rank highest, which can spread your SEO value across multiple duplicates and lead to lower search engine rankings.
Lost crawl budget: Search engines have a limited number of times they will crawl a website within a given time period. If you have a lot of duplicates, it can result in important pages not being crawled often enough. You can read more about crawl budget here.
Canonical tags are a crucial part of any technical SEO strategy. By using canonical tags correctly, you can ensure that you don’t suffer from duplicate content, which can hurt your page’s ranking in search results. The canonical tag gives you control over which version of your page is prioritized in search engines, and is therefore indispensable for optimizing your website’s visibility and crawl budget.
If you need help reviewing your current structure and canonical tags, you are always welcome to contact one of our SEO consultants.
