Moz Q&A is closed.
After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
When is it recommended to use a self referencing rel "canonical"?
-
In what type of a situation is it the best type of practice to use a self referencing rel "canonical" tag?
Are there particular practices to be cautious of when using a self referencing rel "canonical" tag?
I see this practice used mainly with larger websites but I can't find any information that really explains when is a good time to make use of this practice for SEO purposes.
Appreciate all feedback.
Thank you in advance.
-
As others have said above, combating scrapers is a big reason, but you're relying on lazy scrapers not removing the tags.
Another reason is to prevent rogue content management systems from attaching unnecessary query strings to URLs, creating pages that can end up loading infinite times under different URLs. A canonical tag in the source file would mean that any number of duplicate pages point back to the original. The same reason goes for sites that have issues with redirecting www / non-www URLs to the correct version, or who deal with the same problem regarding secure / insecure URLs. In all these cases, the canonical tag is a bandaid, not a cure - it would be better to fix the underlying problem of the rogue CMS, incorrect redirection, etc. but the canonical tag (self-referencing) is there if you need it.
Google doesn't seem to have an issue with it, but if you're at all concerned about the other engines, use with care.
-
People do it to stop scarpers, but if your going to write screen scraper it would not be hard to remove canonical tags as well. so I don't think much of the idea.
Bing recommends that you do not use self ref canonicals tags. It could be that a self ref canonical tag may be followed as is alluded to by Bing, meaning that lose a bit of link juice thought the redirect.
-
You may want to just use it on every page.
One good argument for using a self-referencing rel=canonical on every page is to combat scrapers. If they grab the entire code, including the rel=canonical, they are essentially telling the bots that your page is the original, and they'll be much less likely to outrank you for your own content.
Larger sites tend to generate the rel=canonicals automatically for every page, and give you the option to customize it where necessary.
-
What do you mean?
Like on site.com/pagea.htm there is a canonical set to site.com/pagea.htm? No harm in that. You should have a canonical URL whenever you want only one specific version of a URL.
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
Rel canonical tag from shopify page to wordpress site page
We have pages on our shopify site example - https://shop.example.com/collections/cast-aluminum-plaques/products/cast-aluminum-address-plaque That we want to put a rel canonical tag on to direct to our wordpress site page - https://www.example.com/aluminum-plaques/ We have links form the wordpress page to the shop page, and over time ahve found that google has ranked the shop pages over the wp pages, which we do not want. So we want to put rel canonical tags on the shop pages to say the wp page is the authority. I hope that makes sense, and I would appreciate your feeback and best solution. Thanks! Is that possible?
Intermediate & Advanced SEO | | shabbirmoosa0 -
Does anyone know how to fix this structured data error on search console? Invalid value in field "itemtype"
I'm getting the same structured data error on search console form most of my websites, Invalid value in field "itemtype" I take off all the structured data but still having this problem, according to Search console is a syntax problem but I can't find what is causing this. Any guess, suggestion or solution for this?
Intermediate & Advanced SEO | | Alexanders0 -
SEO on Jobs sites: how to deal with expired listings with "Google for Jobs" around
Dear community, When dealing with expired job offers on jobs sites from a SEO perspective, most practitioners recommend to implement 301 redirects to category pages in order to keep the positive ranking signals of incoming links. Is it necessary to rethink this recommendation with "Google for Jobs" is around? Google's recommendations on how to handle expired job postings does not include 301 redirects. "To remove a job posting that is no longer available: Remove the job posting from your sitemap. Do one of the following: Note: Do NOT just add a message to the page indicating that the job has expired without also doing one of the following actions to remove the job posting from your sitemap. Remove the JobPosting markup from the page. Remove the page entirely (so that requesting it returns a 404 status code). Add a noindex meta tag to the page." Will implementing 301 redirects the chances to appear in "Google for Jobs"? What do you think?
Intermediate & Advanced SEO | | grnjbs07175 -
"noindex, follow" or "robots.txt" for thin content pages
Does anyone have any testing evidence what is better to use for pages with thin content, yet important pages to keep on a website? I am referring to content shared across multiple websites (such as e-commerce, real estate etc). Imagine a website with 300 high quality pages indexed and 5,000 thin product type pages, which are pages that would not generate relevant search traffic. Question goes: Does the interlinking value achieved by "noindex, follow" outweigh the negative of Google having to crawl all those "noindex" pages? With robots.txt one has Google's crawling focus on just the important pages that are indexed and that may give ranking a boost. Any experiments with insight to this would be great. I do get the story about "make the pages unique", "get customer reviews and comments" etc....but the above question is the important question here.
Intermediate & Advanced SEO | | khi50 -
Block in robots.txt instead of using canonical?
When I use a canonical tag for pages that are variations of the same page, it basically means that I don't want Google to index this page. But at the same time, spiders will go ahead and crawl the page. Isn't this a waste of my crawl budget? Wouldn't it be better to just disallow the page in robots.txt and let Google focus on crawling the pages that I do want indexed? In other words, why should I ever use rel=canonical as opposed to simply disallowing in robots.txt?
Intermediate & Advanced SEO | | YairSpolter0 -
After reading of Google's so called "over-optimization" penalty, is there a penalty for changing title tags too frequently?
In other words, does title tag change frequency hurt SEO ? After changing my title tags, I have noticed a steep decline in impressions, but an increase in CTR and rankings. I'd like to once again change the title tags to try and regain impressions. Is there any penalty for changing title tags too often? From SEO forums online, there seems to be a bit of confusion on this subject...
Intermediate & Advanced SEO | | Felix_LLC0 -
What is the best way to optimize/setup a teaser "coming soon" page for a new product launch?
Within the context of a physical product launch what are some ideas around creating a /coming-soon page that "teases" the launch. Ideally I'd like to optimize a page around the product, but the client wants to try build consumer anticipation without giving too many details away. Any thoughts?
Intermediate & Advanced SEO | | GSI0 -
How Google treat internal links with rel="nofollow"?
Today, I was reading about NoFollow on Wikipedia. Following statement is over my head and not able to understand with proper manner. "Google states that their engine takes "nofollow" literally and does not "follow" the link at all. However, experiments conducted by SEOs show conflicting results. These studies reveal that Google does follow the link, but does not index the linked-to page, unless it was in Google's index already for other reasons (such as other, non-nofollow links that point to the page)." It's all about indexing and ranking for specific keywords for hyperlink text during external links. I aware about that section. It may not generate in relevant result during any keyword on Google web search. But, what about internal links? I have defined rel="nofollow" attribute on too many internal links. I have archive blog post of Randfish with same subject. I read following question over there. Q. Does Google recommend the use of nofollow internally as a positive method for controlling the flow of internal link love? [In 2007] A: Yes – webmasters can feel free to use nofollow internally to help tell Googlebot which pages they want to receive link juice from other pages
Intermediate & Advanced SEO | | CommercePundit
_
(Matt's precise words were: The nofollow attribute is just a mechanism that gives webmasters the ability to modify PageRank flow at link-level granularity. Plenty of other mechanisms would also work (e.g. a link through a page that is robot.txt'ed out), but nofollow on individual links is simpler for some folks to use. There's no stigma to using nofollow, even on your own internal links; for Google, nofollow'ed links are dropped out of our link graph; we don't even use such links for discovery. By the way, the nofollow meta tag does that same thing, but at a page level.) Matt has given excellent answer on following question. [In 2011] Q: Should internal links use rel="nofollow"? A:Matt said: "I don't know how to make it more concrete than that." I use nofollow for each internal link that points to an internal page that has the meta name="robots" content="noindex" tag. Why should I waste Googlebot's ressources and those of my server if in the end the target must not be indexed? As far as I can say and since years, this does not cause any problems at all. For internal page anchors (links with the hash mark in front like "#top", the answer is "no", of course. I am still using nofollow attributes on my website. So, what is current trend? Will it require to use nofollow attribute for internal pages?0
