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.
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
-
Are there any downsides to using a canonical tag temporarily?
I'm working on redesigning our website. One of the content types has a main archive page (/success-stories) containing all of the success stories (written by graduates of our program). Because we plan to have success stories for other people (non-graduates), I'm using category hierarchies (/success-stories/graduates and success-stories/nonprofits, for example). It will go one level deeper to organize graduates by graduation year (/success-stories/graduates/%year%). I think this will work out well. However, we won't have non-graduate success stories for a little while, probably at least a few weeks, which means that /success-stories and /.../graduates indices will contain the same content for a while. So my question is this: Will it hurt to use a canonical tag that points to /success-stories/graduates as the authority until the main archive page contains more than just graduates? Or would it be better to use a 302 redirect from /success-stories to /.../graduates until more diverse content is added?
Intermediate & Advanced SEO | | bcaples0 -
Redirecting homepage to internal page (2nd Tier page)
We are planning to experiment redirecting our homepage to one of the 2nd tier page. I mean....example.com to example.com/page. We need this page to rank well, but it doesn't have much internal links or external back-links, so we opt for this redirect. Advantage with this page is, it has "keyword" we want to rank for in URL. "page" in example.com/page. Will this help or hurt us in SEO? I think we are missing keyword in our root domain, so interested to highlight this page. Thanks, Satish
Intermediate & Advanced SEO | | vtmoz0 -
Adding hreflang tags - better on each page, or the site map?
Hello, I am wondering if there seems to be a preference for adding hreflang tags (from this article). My client just changed their site from gTLDs to ccTLDs, and a few sites have taken a pretty big traffic hit. One issue is definitely the amount of redirects to the page, but I am also going to work with the developer to add hreflang tags. My question is - is it better to add them to the header of each page, or the site map, or both, or something else? Any other thoughts are appreciated. Our Australia site, which was at least findable using Australia Google before this relaunch, is not showing up, even when you search the company name directly. Thanks!Lauryn
Intermediate & Advanced SEO | | john_marketade0 -
Is their value in linking to PPC landing pages and using rel="canonical"
I have ppc landing pages that are similar to my seo page. The pages are shorter with less text with a focus on converting visitors further along in the purchase cycle. My questions are: 1. Is there a benefit for having the orphan ppc pages indexed or should I no index them? 2. If indexing does provide benefits, should I create links from my site to the ppc pages or should I just submit them in a sitemap? 3. If indexed, should I use rel="canonical" and point the ppc versions to the appropriate organic page? Thanks,
Intermediate & Advanced SEO | | BrandExpSteve0 -
Can anyone see any issues with the canonical tags on this web site?
The main domain is: http://www.eumom.ie/ And these would be some of the core pages: http://www.eumom.ie/pregnancy/ http://www.eumom.ie/getting-pregnant/ Any help from the Moz community is much appreciated!
Intermediate & Advanced SEO | | IcanAgency0 -
301 canonical'd pages?
I have an ecommerce site with many different URLs with the same product. Let's say the product is a hat. It's in: a a) mysite.com/products/hat b) mysite.com/collections/head-ware/hat c) mysite.com/collections/stuff-to-wear-on-your-head/hat Right now, A is the canonical page for B and C. I want to clean up my site, so that every product only has ONE unique URL, which is linked to from all the collections. So B and C URL will be broken. Is it necessary that I 301 them if they were already canonical'd? Based on the number of products I have, I would have to 301 1000+ URLs. I'm just trying to figure out what I need to do to avoid getting penalized. thanks
Intermediate & Advanced SEO | | birchlore0 -
Scanning For Duplicate Canonical Tags
I'm looking for a solution for identifying pages on a site that have either empty/undefined canonical tags, or duplicate canonical tags (meaning the tag occurs twice within the same page). I've used Screaming Frog to view sitewide canonical values, but the tool cannot identify when pages use the tag twice, nor can it differentiate between pages that have an empty canonical tag and pages that have no canonical tag at all. Any help finding a tool of some sort that can assist me in doing this would be much appreciated, as I'm working with tens of thousands of pages and can't do this manually.
Intermediate & Advanced SEO | | edmundsseo0 -
Does a Single Instance of rel="nofollow" cause all instances on a page to be nofollowed?
I attended the Bruce Clay training at SMX Advanced Seattle, and he mentioned link pruning/sculpting (here's an SEOMoz article about it - http://www.seomoz.org/blog/google-says-yes-you-can-still-sculpt-pagerank-no-you-cant-do-it-with-nofollow) Now during his presentation he mentioned that if you have one page with multiple links leading to another page, and one of those links is nofollowed, it could cause all links to be nofollowed. Example: Page A has 4 links to Page B: 1:followed, 2:followed, 3:nofollowed, 4:followed The presence of a single nofollow tag would override the 3 followed links and none of them would pass link juice. Has anyone else encountered this problem, and Is there any evidence to support this? I'm thinking this would make a great experiment.
Intermediate & Advanced SEO | | brycebertola0