Canonical Tag: What is it and why it matters

Last Updated April 22, 2024

Today, we are going to talk about a term that is crucial for your blog’s SEO – the Canonical Tag.

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What is a Canonical Tag?

A canonical tag, also known as rel=canonical, is a piece of HTML code that helps search engines identify the main version of a page when there are multiple pages with identical or very similar content.

In simpler terms, it’s a way to tell search engines, “Hey, this is the main version of this page that I want you to index and show in the search results.”

For example, the canonical tag for your main blog page might look like this:

<link rel="canonical" href="https://yourblog.com/main-page/" />

Why Are Canonical Tags Important?

Avoid Duplicate Content: Search engines, like Google, don’t like duplicate content. It confuses them, and they might end up indexing and ranking the wrong version of your page. Canonical tags help you specify which version of the page you want to be considered as the main one.
Consolidate Link Equity: If there are multiple versions of a page, the backlinks to those pages will be divided among them. By using a canonical tag, you consolidate the link equity to the main page, which can help improve its ranking.
Improve Crawling Efficiency: Search engines have a crawl budget, which is the number of pages they will crawl on your site in a given time. By using canonical tags, you can help search engines to not waste their crawl budget on duplicate pages.

Best Practices for Using Canonical Tags

Use Absolute URLs: Always use the absolute URL in the canonical tag, not the relative URL. For example, use https://yourblog.com/main-page/ instead of /main-page/.
Self-Canonicalize: Even if a page doesn’t have any duplicates, it’s still a good practice to include a self-referencing canonical tag. This helps to avoid any confusion for search engines.
Be Consistent: Make sure that the URL used in the canonical tag is consistent across the site. For example, if your site uses https, make sure that the canonical tag also uses https.

Common Mistakes to Avoid

Canonical Chains: A canonical chain occurs when Page A references Page B as the canonical, and Page B references Page C as the canonical. Always point the canonical tag directly to the main version of the page.
Multiple Canonical Tags: There should only be one canonical tag on a page. If there are multiple canonical tags, search engines might ignore them.
Non-Similar Content: Don’t use the canonical tag on pages with completely different content. It should only be used on pages with identical or very similar content.

Conclusion

Canonical tags are an essential tool for bloggers to manage duplicate content, consolidate link equity, and improve crawling efficiency. By using them correctly, you can help search engines understand your content better and improve your blog’s SEO.

Do I need a canonical tag on every page?

Yes, it is a good idea to include a canonical tag on every indexable page. A self-referencing canonical tag tells Google, “This page is the main version.”

This is helpful even when you do not think you have duplicates. Small URL changes like tracking codes, print views, or different category paths can create “extra” versions of the same content.

Most modern sites and SEO plugins add canonicals automatically, but it is still worth spot checking. Make sure each page has only one canonical tag and it points to the exact URL you want indexed.

When should I use a canonical tag vs a noindex tag?

Use a canonical tag when pages are the same or very close, and you want search engines to rank one main version. It helps consolidate ranking signals, like backlinks, to the canonical URL.

Use noindex when you do not want a page to show up in search at all. This is common for thin pages, internal search results, or pages that are only for logged-in users.

If you are unsure, start by learning the basics of noindex vs canonical. Choosing the right one helps you avoid wasting crawl budget and keeps your search results cleaner.

How do I choose the right canonical URL when there are duplicates?

Pick the version you want people to land on from Google, then point all duplicates to that URL. In most cases, this is the cleanest URL with the best content and the strongest internal links.

Be consistent with your URL format. If your site uses https, trailing slashes, or lowercase URLs, your canonical should match that exact format.

Always use absolute URLs in the canonical tag, not relative paths. For example, use https://yourblog.com/page/ instead of /page/ so search engines do not misread the location.

What are the most common canonical tag mistakes that hurt SEO?

The biggest issues are canonical chains, multiple canonical tags, and pointing canonicals to pages that are not truly similar. These problems can cause Google to ignore your signals or index the wrong page.

Another common mistake is mixing protocols or versions, like pointing from https to http, or from the live page to a staging domain. That can split rankings and create more duplicates.

If a page should be indexed but is not showing up, you can also review your indexing flow and then submit for indexing after you fix the canonical. That helps Google discover the correct version faster.

How can RightBlogger help me prevent duplicate content and keep my SEO clean?

RightBlogger can help you spot SEO problems earlier and keep posts consistent as you publish more content. This reduces the chance that multiple pages compete for the same keyword.

For example, you can use SEO Reports to review on-page SEO and catch issues that can lead to confusion in search results. It is a practical way to keep your content library organized as it grows.

If you are updating older posts, Auto Optimize can speed up improvements like clearer headings, better keyword use, and stronger internal structure. Cleaner content and cleaner URLs make canonical choices easier and more reliable.