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!
-
Thank you for you responses and advice!
-
Very nice addition John.
-
Ryan, spot on as always.
One other thing, it sounds like some of the canonicals you're placing on pages would be better suited to 301 redirects, like correcting a URL for not having a trailing slash or not. If you can avoid using canonicals and use 301 redirects instead, that's the preferred method for resolving duplicate content issues. Canonicals are more for when there are parameters on the URLs, and you can't get away from serving the pages with those parameters.
-
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 first thing to understand is the canonical tag is a suggestion, not an order. While a search engine will usually honor the canonical tag, there are instances where Google or other SEs may determine the canonical tag is not being used correctly so they disregard the canonical tag. Based on this understanding, yes the robot will read the entire page regardless of the canonical tag status.
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?
The two tags you mention conflict. You would never use both tags on the same page.
Noindex means you do not wish the page to appear in the search index. The canonical tag means you do wish the content to be included in the search index, but use the canonical URL in the index.
if both a canonical tag and no index, follow tag are in place, should they be in a specific order?
The order of meta tags does not matter. If a page was marked with both a canonical tag and a noindex tag, the noindex tag would take effect and the page would not be indexed, so the canonical tag would not have any effect.
In short, you want to use the canonical tag to resolve duplicate content issues, not the noindex tag.
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
-
Topics and H tag
Hello, Is it ok to talk about multiple topics under an H tag or should I stick to 1 topic per H tag. Thank you,
Intermediate & Advanced SEO | | seoanalytics0 -
Href Lang & Canonical Tags
Hi I have 2 issues appearing on my site audit, for a number of pages. I don't think I actually have an issue but just want to make sure. Using this page as an example - http://www.key.co.uk/en/key/0-5-l-capacity-round-safety-can-149p210 The errors I get are: 1. Conflicting hreflang and rel=canonical Canonical page points to a different language URL - when using href & canonicals, it states I need a self referential canonical . The page above is a SKU page, so we include a canonical back to the original model page so we don't get lots of duplicate content issues. Our canonical will point to - http://www.key.co.uk/en/key/justrite-round-safety-cans 2. No self referencing hreflang. Are these big issues? I'd think the bigger issue would be if I add self referencing canonicals and end up with lots of duplicate content. Any advice would be much appreciated 🙂
Intermediate & Advanced SEO | | BeckyKey0 -
Changing Canonical Tags on Indexed Pages that are Ranking Well
Hi Guys, I recently rolled out a domain wide canonical tag change. Previously the website had canonical tags without the www, however the website was setup to redirect to www on page load. I noticed that the site competitors were all using www and as far as I understand www versus non www, it's based on preference. In order to keep things consistent, I changed the canonical tag to include the www. Will the site drop in rankings? Especially if the pages are starting to rank quite well. Any feedback is appreciated. Thanks!
Intermediate & Advanced SEO | | QuickToImpress0 -
Index or noindex mobile version?
We have a website called imones.lt
Intermediate & Advanced SEO | | FCRMediaLietuva
and we have a mobile version for it m.imones.lt We originally put noindex for m.imones.lt. Is it a good decision or no? We believe that if google indexes both it creates double content. We definitely don't want that? But when someone through google goes to any of imones.lt webpage using smartphone they are redirected to m.imones.lt/whatever Thank you for your opinion.0 -
Do you add 404 page into robot file or just add no index tag?
Hi, got different opinion on this so i wanted to double check with your comment is. We've got /404.html page and I was wondering if you would add this page to robot text so it wouldn't be indexed or would you just add no index tag? What would be the best approach? Thanks!
Intermediate & Advanced SEO | | Rubix0 -
Rel=canonical
I have seen that almost all of my website pages need rel=canonical tag. Seems that something's wrong here since I have unique content to every page. Even show the homepage as a rel=canonical which doesnt make sense. Can anyone suggest anything? or just ignore those issues.
Intermediate & Advanced SEO | | arcade880 -
Canonical url issue
Canonical url issue My site https://ladydecosmetic.com on seomoz crawl showing duplicate page title, duplicate page content errors. I have downloaded the error reports csv and checked. From the report, The below url contains duplicate page content.
Intermediate & Advanced SEO | | trixmediainc
https://www.ladydecosmetic.com/unik-colours-lipstick-caribbean-peach-o-27-item-162&category_id=40&brands=66&click=brnd And other duplicate urls as per report are,
https://www.ladydecosmetic.com/unik-colours-lipstick-plum-red-o-14-item-157&category_id=40&click=colorsu&brands=66 https://www.ladydecosmetic.com/unik-colours-lipstick-plum-red-o-14-item-157&category_id=40 https://www.ladydecosmetic.com/unik-colours-lipstick-plum-red-o-14-item-157&category_id=40&brands=66&click=brnd But on every these url(all 4) I have set canonical url. That is the original url and an existing one(not 404). https://www.ladydecosmetic.com/unik-colours-lipstick-caribbean-peach-o-27-item-162&category_id=0 Then how this issues are showing like duplicate page content. Please give me an answer ASAP.0 -
Why should your title and H1 tag be different?
Is it dangerous to have your H1 tag and your title the exact same thing? My thought was that it's not be the best use of space, but that it couldn't cause harm. What do you think?
Intermediate & Advanced SEO | | MarieHaynes7