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.
Any penalty for having rel=canonical tags on every page?
-
For some reason every webpage of our website (www.nathosp.com) has a rel=canonical tag. I'm not sure why the previous SEO manager did this, but we don't have any duplicate content that would require a canonical tag.
Should I remove these tags? And if so, what's the advantage - or disadvantage of leaving them in place?
Thank you in advance for your help.
-Josh Fulfer
-
There isn't a direct penalty for having rel="canonical" tags on every page, no, as long as you are correctly utilizing them (i.e. don't set the href of the tag to an invalid or non-existent URL). If there is even the possibility of duplicate content on your website, it is best to use canonical tags.
For websites serving straight HTML files, both http://www.example.com/index.html and http://www.example.com/ likely serve the same content.
If you use a framework like ASP.NET MVC, it would by default return duplicate content for both http://www.example.com/ and http://www.example.com/Home/Index.
Choose one or the other and set your canonical tag to that:
(note: the trailing slash is optional - just be consistent with including it or not)
-
You can use a canonical tag on page A, to point to A, telling that this is the original, teh reason for this is when people scrape your site they will point back home.
i belive thats is what they were getting at
you would only point it at B if B was a duplicate.
-
Ryan - I appreciate your help. My initial thought too was that I could remove it to clean up the code. However, I was unaware that the tag helps with dynamically generated pages - which ours are.
Thank you for your thorough response.
-
as far as i can see josh, the canonical URLs on your site are doing what they should be doing. I havn't looked to deep into it, but it seems like your products all refer back to product category pages, so that is the right way to use them.
-
I have never heard of anyone being penalised for having it on every page. Plus I can't see that ever happening unless it has been implemented incorrectly of course.
-
page A has content about apples. page B has content about bubblegum. Canonical tag states that page B should refer to page A. What is the point of that? all link juice, all ranking potential is passed to page A, even though page B has very different content. So page A MIGHT appear in search results about bubblegum, but page B will not because it is passing all link juice and rank potential to page A about apples. People stop going to page A when looking for bubblegum because it is irrelevant, and bounce rates increase.
Dont think you need documentation to get this. If you have all pages redirecting bots via canonical urls to the SAME page, it is pointless. If you have several article about apples and point them all to page A that is a different story.
-
not sure what you mean here, I have a canonical on every page, I program my sites to dynamicly to do, the reason i do so, is if someone scraps a page, it will have my address in the canonical tag.
I dont know what you mean by not relative to the tag. it just a href, are we talking about the same thing?
rel="canonical" href=http://mydomain.com/>
-
Having canonical tags on pages that don't have any duplicate content is pointless, as it may actually stop you for ranking on keywords specific to pages not relative to the tag.
Please, may you present me a document that assess what are you saying? because it is the first time I hear this thing.
#curious
-
The disadvantage to keeping a canonical tag on a page which does not require it would be, as a rule, you want to present your web page with the least amount of code possible. Unnecessary code causes extra confusion and adds to the processing time of web pages.
I use the canonical tag on all pages, but not everyone agrees. If you would like further support, SEOmoz uses the tag on all pages as well. If you use any CMS, ecommerce software, forum software or any system which generates pages dynamically then I would highly recommend a canonical tag on every page. At times a system will generate pages which you might not be aware of, but a crawler will find.
Sometimes a page will offer a print version, the ability to sort on ascending/descending, and numerous other changes. You might think you only have one version of your page but have many versions which you do not realize exist. A proper canonical tag ensures the correct version of your URL is always offered for indexing, and you avoid duplicate content issues. With that said, if you have a basic html/css/php site and you are 100% confident in your programmer, then it is not necessary.
EDIT: In your case, it seems the canonical tags are performing a necessary function. From your home page I clicked on your featured item and I landed on the following URL:
http://www.nathosp.com/product/r1212_c
You have the identical page offered under another URL: http://www.nathosp.com/product/r1212_c/hotel_towels.
If you were to remove the canonical, you would have duplicate content issues on your site.
-
rel=canonical just passes all link juice from one page to the next, it tells bots to use the page specified in the tag to assess link value and page authority. Having canonical tags on pages that don't have any duplicate content is pointless, as it may actually stop you for ranking on keywords specific to pages not relative to the tag. I would look at it closely or ask the last SEO why they did this before removing them. But by the sounds of it, you dont really need them.
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 -
For FAQ Schema markup, do we need to include every FAQ that is on the page in the markup, or can we use only selected FAQs?
The website FAQ page we are working on has more than 50 FAQs. FAQ Schema guidelines say the markup must be an exact match with the content. Does that mean all 50+ FAQs must be in the mark-up? Or does that mean the few FAQs we decided to put in the markup are an exact match?
Intermediate & Advanced SEO | | PKI_Niles0 -
Rel=canonical and internal links
Hi Mozzers, I was musing about rel=canonical this morning and it occurred to me that I didnt have a good answer to the following question: How does applying a rel=canonical on page A referencing page B as the canonical version affect the treatment of the links on page A? I am thinking of whether those links would get counted twice, or in the case of ver-near-duplicates which may have an extra sentence which includes an extra link, whther that extra link would count towards the internal link graph or not. I suspect that google would basically ignore all the content on page A and only look to page B taking into account only page Bs links. Any thoughts? Thanks!
Intermediate & Advanced SEO | | unirmk0 -
Should my back links go to home page or internal pages
Right now we rank on page 2 for many KWs, so should i now focus my attention on getting links to my home page to build domain authority or continue to direct links to the internal pages for specific KWs? I am about to write some articles for several good ranking sites and want to know whether to link my company name (same as domain name) or KW to the home page or use individual KWs to the internal pages - I am only allowed one link per article to my site. Thanks Ash
Intermediate & Advanced SEO | | AshShep10 -
Should you use a canonical tag on translated content in a multi-language country?
A customer of ours has a website in Belgium. There two main languages in Belgium: Dutch and French.
Intermediate & Advanced SEO | | Zanox
At first there was only a Dutch version with a .be extension. Right now they are implementing the French Belgium version on the URL website.be/fr. All of the content and comments will be translated. Also the URL’s will change from Dutch to French, so you've got two URL’s with the same content but in another language. Question: Should you use a canonical tag on translated content in a multi-language country? I think Google will understand this is just for the usability for a Multilanguage country. What do you guys think???0 -
Meta Tag Force Page Refresh - Good or Bad?
I had recently come across a meta tag that could cause a auto refresh on a users browser when implemented. I have been using it for a redesign and was curious if there could be any negative effects for using it, here is the code: All input is appreciated. Ciao, Todd Richard
Intermediate & Advanced SEO | | RichFinnSEO0 -
Rel=canonical tag on original page?
Afternoon All,
Intermediate & Advanced SEO | | Jellyfish-Agency
We are using Concrete5 as our CMS system, we are due to change but for the moment we have to play with what we have got. Part of the C5 system allows us to attribute our main page into other categories, via a page alaiser add-on. But what it also does is create several url paths and duplicate pages depending on how many times we take the original page and reference it in other categories. We have tried C5 canonical/SEO add-on's but they all seem to fall short. We have tried to address this issue in the most efficient way possible by using the rel=canonical tag. The only issue is the limitations of our cms system. We add the canonical tag to the original page header and this will automatically place this tag on all the duplicate pages and in turn fix the problem of duplicate content. The only problem is the canonical tag is on the original page as well, but it is referencing itself, effectively creating a tagging circle. Does anyone foresee a problem with the canonical tag being on the original page but in turn referencing itself? What we have done is try to simplify our duplicate content issues. We have over 2500 duplicate page issues because of this aliasing add-on and want to automate the canonical tag addition, rather than go to each individual page and manually add this tag, so the original reference page can remain the original. We have implemented this tag on one page at the moment with 9 duplicate pages/url's and are monitoring, but was curious if people had experienced this before or had any thoughts?0 -
How does a canonical work and is it necessary to also have a no index, follow tag in place?
Across our site, we have canonical tags in place for URLs that contain duplicate content and for URLs without a trailing slash since we are using URLs WITH a trailing slash for all URLs across our site. We also recently added a no index, follow tag to all non-canonical URLs since we noticed a high number of duplicate content URLs in Google Webmaster Tools. The first part of my question is: How does a canonical work? Does the robot read the canonical and immediately go to the canonical URL or does it continue to read past the canonical tag and get to the no index, follow tag if there is one present? The second part of my question is: Is it necessary to have both a canonical tag and no index, follow tag in place? Or should the canonical tag be sufficient to avoid duplicate content? And lastly, if both a canonical tag and no index, follow tag are in place, should they be in a specific order? Canonical tag first then no index, follow tag second or no index, follow tag first then canonical tag second? I would appreciate any insight you can give. Thank you!
Intermediate & Advanced SEO | | kbbseo0