undefined
Skip to content
Moz logo Menu open Menu close
  • Products
    • Moz Pro
    • Moz Pro Home
    • Moz Local
    • Moz Local Home
    • STAT
    • Moz API
    • Moz API Home
    • Compare SEO Products
    • Moz Data
  • Free SEO Tools
    • Domain Analysis
    • Keyword Explorer
    • Link Explorer
    • Competitive Research
    • MozBar
    • More Free SEO Tools
  • Learn SEO
    • Beginner's Guide to SEO
    • SEO Learning Center
    • Moz Academy
    • SEO Q&A
    • Webinars, Whitepapers, & Guides
  • Blog
  • Why Moz
    • Digital Marketers
    • Agency Solutions
    • Enterprise Solutions
    • Small Business Solutions
    • The Moz Story
    • New Releases
  • Log in
  • Log out
  • Products
    • Moz Pro

      Your all-in-one suite of SEO essentials.

    • Moz Local

      Raise your local SEO visibility with complete local SEO management.

    • STAT

      SERP tracking and analytics for enterprise SEO experts.

    • Moz API

      Power your SEO with our index of over 44 trillion links.

    • Compare SEO Products

      See which Moz SEO solution best meets your business needs.

    • Moz Data

      Power your SEO strategy & AI models with custom data solutions.

    NEW Keyword Suggestions by Topic
    Moz Pro

    NEW Keyword Suggestions by Topic

    Learn more
  • Free SEO Tools
    • Domain Analysis

      Get top competitive SEO metrics like DA, top pages and more.

    • Keyword Explorer

      Find traffic-driving keywords with our 1.25 billion+ keyword index.

    • Link Explorer

      Explore over 40 trillion links for powerful backlink data.

    • Competitive Research

      Uncover valuable insights on your organic search competitors.

    • MozBar

      See top SEO metrics for free as you browse the web.

    • More Free SEO Tools

      Explore all the free SEO tools Moz has to offer.

    NEW Keyword Suggestions by Topic
    Moz Pro

    NEW Keyword Suggestions by Topic

    Learn more
  • Learn SEO
    • Beginner's Guide to SEO

      The #1 most popular introduction to SEO, trusted by millions.

    • SEO Learning Center

      Broaden your knowledge with SEO resources for all skill levels.

    • On-Demand Webinars

      Learn modern SEO best practices from industry experts.

    • How-To Guides

      Step-by-step guides to search success from the authority on SEO.

    • Moz Academy

      Upskill and get certified with on-demand courses & certifications.

    • MozCon

      Save on Early Bird tickets and join us in London or New York City

    Unlock flexible pricing & new endpoints
    Moz API

    Unlock flexible pricing & new endpoints

    Find your plan
  • Blog
  • Why Moz
    • Digital Marketers

      Simplify SEO tasks to save time and grow your traffic.

    • Small Business Solutions

      Uncover insights to make smarter marketing decisions in less time.

    • Agency Solutions

      Earn & keep valuable clients with unparalleled data & insights.

    • Enterprise Solutions

      Gain a competitive edge in the ever-changing world of search.

    • The Moz Story

      Moz was the first & remains the most trusted SEO company.

    • New Releases

      Get the scoop on the latest and greatest from Moz.

    Surface actionable competitive intel
    New Feature

    Surface actionable competitive intel

    Learn More
  • Log in
    • Moz Pro
    • Moz Local
    • Moz Local Dashboard
    • Moz API
    • Moz API Dashboard
    • Moz Academy
  • Avatar
    • Moz Home
    • Notifications
    • Account & Billing
    • Manage Users
    • Community Profile
    • My Q&A
    • My Videos
    • Log Out

The Moz Q&A Forum

  • Forum
  • Questions
  • Users
  • Ask the Community

Welcome to the Q&A Forum

Browse the forum for helpful insights and fresh discussions about all things SEO.

  1. Home
  2. SEO Tactics
  3. Technical SEO
  4. Rel canonical between mirrored domains

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.

Rel canonical between mirrored domains

Technical SEO
2
6
908
Loading More Posts
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as question
Log in to reply
This topic has been deleted. Only users with question management privileges can see it.
  • AlexSG
    AlexSG last edited by Jan 14, 2014, 4:22 AM

    Hi all & happy new near!

    I'm new to SEO and could do with a spot of advice:

    I have a site that has several domains that mirror it (not good, I know...)  So www.site.com, www.site.edu.sg, www.othersite.com all serve up the same content.  I was planning to use rel="canonical" to avoid the duplication but I have a concern:

    Currently several of these mirrors rank - one, the .com ranks #1 on local google search for some useful keywords. the .edu.sg also shows up as #9 for a dirrerent page. In some cases I have multiple mirrors showing up on a specific serp.

    I would LIKE to rel canonical everything to the local edu.sg domain since this is most representative of the fact that the site is for a school in Singapore but...
    -The .com is listed in DMOZ (this used to be important) and none of the volunteers there ever respoded to requests to update it to the .edu.sg
    -The .com ranks higher than the com.sg page for non-local search so I am guessing google has some kind of algorithm to mark down obviosly local domains in other geographic locations

    Any opinions on this? Should I rel canonical the .com to the .edu.sg or vice versa?

    I appreciate any advice or opinion before I pull the trigger and end up shooting myself in the foot!

    Best regards from Singapore!

    1 Reply Last reply Reply Quote 0
    • Dr-Pete
      Dr-Pete Staff @AlexSG last edited by Jan 18, 2014, 9:07 PM Jan 18, 2014, 9:07 PM

      Wow - that's a huge impact. It's hard for me to believe this one change would have such an impact, but hopefully these new numbers stick.

      1 Reply Last reply Reply Quote 0
      • AlexSG
        AlexSG @Dr-Pete last edited by Jan 18, 2014, 4:44 AM Jan 18, 2014, 4:44 AM

        Hi Dr. Peter,

        Just thought I would share the initial results of your suggestion because they appear to be so dramatic!

        I put it a rel=alternate tag on every page indicating the .edu.sg version of the URL for "en-sg" and the com version of the url for "en".

        From MozAnalytics: Before
        Rank 1-3: 4 keywords
        Rank 4-10: 21 keywords
        Rank 11-20: 3 keywords
        Rank 21-50: 2 keywords
        Rank 51+: 216 keywords

        From MozAnalytics: After
        Rank 1-3: 50 keywords!!!
        Rank 4-10: 19 keywords
        Rank 11-20: 3 keywords
        Rank 21-50: 13 keywords
        Rank 51+: 167 keywords

        That's pretty crazy in under a week - Not sure if its 'real' since I never personally went to check rankings on these keywords, but wow! If the MozAnalytics information is correct I am blown away!   Unfortunately its for a niche site in a tiny market so its not going to lead to fame and riches, but its still an amazing result!

        Thanks so much for the great advice 🙂

        Alex

        Dr-Pete 1 Reply Last reply Jan 18, 2014, 9:07 PM Reply Quote 0
        • Dr-Pete
          Dr-Pete Staff @AlexSG last edited by Jan 15, 2014, 2:30 PM Jan 15, 2014, 2:30 PM

          Happy to help - hope it does the trick.

          AlexSG 1 Reply Last reply Jan 18, 2014, 4:44 AM Reply Quote 1
          • AlexSG
            AlexSG last edited by Jan 15, 2014, 3:17 AM Jan 15, 2014, 3:17 AM

            Fantastic response Dr. Peter! Thanks for taking the time to explain and to suggest the rel="alternate" tag which I have now implemented in a little experiment.

            I very much enjoy your posts on the moz blog and thank you for all the indirect help they have given us in the past.

            Best regards,

            Alex

            Dr-Pete 1 Reply Last reply Jan 15, 2014, 2:30 PM Reply Quote 0
            • Dr-Pete
              Dr-Pete Staff last edited by Jan 15, 2014, 3:17 AM Jan 14, 2014, 5:58 PM

              I'm not sure there's a one-sized-fits-all answer. If the .com is more geared to an audience outside of Singapore, and the .edu.sg site is more geared to the local audience you could set a region and/or language with rel="alternate" hreflang:

              https://support.google.com/webmasters/answer/189077?hl=en

              This is a bit more subtle canonicalization signal that Google can use to sort out sites with language and/or regional copies (the regional aspect may be relevant even if both sites are in english).

              The next question would be: where does your traffic come from? If you want to consolidate, but most of your traffic is coming from outside of Singapore, then I'd probably stick with the .com - it still has a "generic" status. The .edu.sg may rank more strongly in Singapore but fall off everywhere else.

              I wouldn't worry much about the DMOZ link, especially if you have a solid link profile. DMOZ links have gotten buried over the years and typically don't carry nearly the value most people think. At some point, they could be a solid boost to a new site with a small link profile, but I think even those days are well behind us.

              1 Reply Last reply Reply Quote 1
              • 1 / 1
              1 out of 6
              • First post
                1/6
                Last post

              Got a burning SEO question?

              Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.


              Start my free trial


              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.

              • See all categories

              Related Questions

              • SoulSurfer8

                Rel=Canonical For Landing Pages

                We have PPC landing pages that are also ranking in organic search. We've decided to create new landing pages that have been improved to rank better in natural search. The PPC team however wants to use their original landing pages so we are unable to 301 these pages to the new pages being created. We need to block the old PPC pages from search. Any idea if we can use rel=canonical? The difference between old PPC page and new landing page is much more content to support keyword targeting and provide value to users. Google says it's OK to use rel=canonical if pages are similar but not sure if this applies to us. The old PPC pages have 1 paragraph of content followed by featured products for sale. The new pages have 4-5 paragraphs of content and many more products for sale. The other option would be to add meta noindex to the old PPC landing pages. Curious as to what you guys think. Thanks.

                Technical SEO | Oct 4, 2017, 5:39 PM | SoulSurfer8
                0
              • Answer2cancer

                Rel=canonical on Godaddy Website builder

                Hey crew! First off this is a last resort asking this question here. Godaddy has not been able to help so I need my Moz Fam on this one. So common problem My crawl report is showing I have duplicate home pages www.answer2cancer.org and www.answer2cancer.org/home.html I understand this is a common issue with apache webservers which is why the wonderful rel=canonical tag was created! I don't want to go through the hassle of a 301 redirect of course for such a  simple issue. Now here's the issue. Godaddy website builder does not make any sense to me. In wordpress I could just go add the tag to the head in the back end. But no such thing exist in godaddy. You have to do this weird drag and drop html block and drag it somewhere on the site and plug in the code. I think putting before the code instead of just putting it in there. So I did that but when I publish and inspect in chrome I cannot see the tag in the head! This is confusing I know. the guy at godaddy didn't stand a chance lol. Anyway much love for any replies!

                Technical SEO | Apr 28, 2016, 12:31 AM | Answer2cancer
                0
              • Jon-S

                Product Variations (rel=canonical or 301) & Duplicate Product Descriptions

                Hi All, Hoping for a bit of advice here please, I’ve been tasked with building an e-commerce store and all is going well so far. We decided to use Wordpress with Woocommerce as our shop plugin. I’ve been testing the CSV import option for uploading all our products and I’m a little concerned on two fronts: - Product Variations Duplicate content within the product descriptions **Product Variations: - ** We are selling furniture that has multiple variations (see list below) and as a result it creates c.50 product variations all with their own URL’s. Facing = Left, Right Leg style = Round, Straight, Queen Ann Leg colour = Black, White, Brown, Wood Matching cushion = Yes, No So my question is should I 301 re-direct the variation URL’s to the main product URL as from a user perspective they aren't used (we don't have images for each variation that would trigger the URL change, simply drop down options for the user to select the variation options) or should I add the rel canonical tag to each variation pointing back to the main product URL. **Duplicate Content: - ** We will be selling similar products e.g. A chair which comes in different fabrics and finishes, but is basically the same product.  Most, if not all of the ‘long’ product descriptions are identical with only the ‘short’ product descriptions being unique. The ‘long’ product descriptions contain all the manufacturing information, leg option/colour information, graphics, dimensions, weight etc etc. I’m concerned that by having 300+ products all with identical ‘long’ descriptions its going to be seen negatively by google and effect the sites SEO. My question is will this be viewed as duplicate content?  If so, are there any best practices I should be following for handling this, other than writing completely unique descriptions for each product, which would be extremely difficult given its basically the same products re-hashed. Many thanks in advance for any advice.

                Technical SEO | Oct 22, 2015, 1:07 PM | Jon-S
                0
              • AdenaSEO

                Link rel="prev" AND canonical

                Hi guys, When you have several tabs on your website with products, you can most likely navigate to page 2, 3, 4 etc...
                You can add the link rel="prev" and link rel="next" tags to make sure that 1 page get's indexed / ranked by Google. am I correct? However this still means that all the pages can get indexed, right? For example a webshop makes use of the link rel="prev" and ="next" tags. In the Google results page though, all the seperate tabs pages are still visible/indexed..
                http://www.domain.nl/watches/?tab=1
                http://www.domain.nl/watches/?tab=24
                http://www.domain.nl/watches/?tab=19
                etc..... Can we prevent this, and make sure only the main page get's indexed and ranked,  by adding a canonical link on every 'tab page' to the main page --> www.domain.nl/watches/ I hope I explained it well and I'm looking forward to hearing from you. Regards, Tom

                Technical SEO | Jul 14, 2015, 3:03 PM | AdenaSEO
                1
              • inlinear

                Correct linking to the /index of a site and subfolders: what's the best practice? link to: domain.com/ or domain.com/index.html ?

                Dear all, starting with my .htaccess file: RewriteEngine On
                RewriteCond %{HTTP_HOST} ^www.inlinear.com$ [NC]
                RewriteRule ^(.*)$ http://inlinear.com/$1 [R=301,L] RewriteCond %{THE_REQUEST} ^./index.html 
                RewriteRule ^(.)index.html$ http://inlinear.com/ [R=301,L] 1. I redirect all URL-requests with www. to the non www-version...
                2. all requests with "index.html" will be redirected to "domain.com/" My questions are: A) When linking from a page to my frontpage (home) the best practice is?: "http://domain.com/" the best and NOT: "http://domain.com/index.php" B) When linking to the index of a subfolder "http://domain.com/products/index.php" I should link also to: "http://domain.com/products/" and not put also the index.php..., right? C) When I define the canonical ULR, should I also define it just: "http://domain.com/products/" or in this case I should link to the definite file: "http://domain.com/products**/index.php**" Is A) B) the best practice? and C) ? Thanks for all replies! 🙂
                Holger

                Technical SEO | Jul 25, 2013, 6:54 PM | inlinear
                0
              • jdossetti

                Adding Rel Canonical to multiple pages

                Hi, Our CMS generates a lot of duplicate content, (Different versions of every page for 3 different font sizes). There are many other reasons why we should drop this current CMS and go with something else, and we are in the process of doing that. But for now, does anyone know how would I do the following: I've created a spreadsheet that contains the following: Column 1: rel="canonical" tag for URL Column 2: Duplicate Content URL # 1 Column 3: Duplicate Content URL # 2 Column 4: Duplicate Content URL # 3 I want to add the tag from column 1 into the head of every page from column 2,3, and 4. What would be a fast way to do this considering that I have around 1800 rows. Check the screenshot of the builtwith.com result to see more information about the website if that helps. Farris bxySL

                Technical SEO | Jul 20, 2012, 3:50 PM | jdossetti
                0
              • MarkChambers

                Mobile Domain Setup

                Hi, If I want to serve a subset of pages on my mobile set from my desktop site or the content is significantly different, i.e. it is not one to one or pages are a summarised version of the desktop, should I use m.site.com or is it still better to use site.com? Many thanks any help appreciated.

                Technical SEO | Jan 28, 2012, 3:29 PM | MarkChambers
                0
              • RobMay

                Using hyphenated sub-domains or non-hyphenated sub-domains? What is the question! I Any takers?

                For our corporate business level domain, we are exploring using a hyphenated sub-domain foir a project. Something like www.go-figure.extreme.com I thought from a user perspective it seems cluttered. The domain length might also be an issue with the new Algorithm big G has launched in recent past. I know with past experience, hyphenated domains usually take longer to index, as they are used by spammers more frequently and can take longer to get out of the supplementary index. Our company site has over 90 million viewers / year, so our brand is well established and traffic isn't an issue. This is for a corporate level project and I didn't have the answer! Will this work? anyone have any experience testing this. Any thoughts will help! Thanks, Rob

                Technical SEO | Sep 13, 2011, 4:13 PM | RobMay
                0

              Get started with Moz Pro!

              Unlock the power of advanced SEO tools and data-driven insights.

              Start my free trial
              Products
              • Moz Pro
              • Moz Local
              • Moz API
              • Moz Data
              • STAT
              • Product Updates
              Moz Solutions
              • SMB Solutions
              • Agency Solutions
              • Enterprise Solutions
              Free SEO Tools
              • Domain Authority Checker
              • Link Explorer
              • Keyword Explorer
              • Competitive Research
              • Brand Authority Checker
              • Local Citation Checker
              • MozBar Extension
              • MozCast
              Resources
              • Blog
              • SEO Learning Center
              • Help Hub
              • Beginner's Guide to SEO
              • How-to Guides
              • Moz Academy
              • API Docs
              About Moz
              • About
              • Team
              • Careers
              • Contact
              Why Moz
              • Case Studies
              • Testimonials
              Get Involved
              • Become an Affiliate
              • MozCon
              • Webinars
              • Practical Marketer Series
              • MozPod
              Connect with us

              Contact the Help team

              Join our newsletter
              Moz logo
              © 2021 - 2025 SEOMoz, Inc., a Ziff Davis company. All rights reserved. Moz is a registered trademark of SEOMoz, Inc.
              • Accessibility
              • Terms of Use
              • Privacy

              Looks like your connection to Moz was lost, please wait while we try to reconnect.