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
      • MozCon
      • 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.

      Track AI Overviews in Keyword Research
      Moz Pro

      Track AI Overviews in Keyword Research

      Try it free!
    • 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. On-Page Optimization
    4. Solve duplicate content issues by using robots.txt

    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.

    Solve duplicate content issues by using robots.txt

    On-Page Optimization
    2
    5
    974
    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.
    • JohnHuynh
      JohnHuynh last edited by

      Hi,

      I have a primary website and beside that I also have some secondary websites with have same contents with primary website. This lead to duplicate content errors. Because of having many URL duplicate contents, so I want to use the robots.txt file to prevent google index the secondary websites to fix the duplicate content issue. Is it ok?

      Thank for any help!

      1 Reply Last reply Reply Quote 0
      • JohnHuynh
        JohnHuynh @simon_realbuzz last edited by

        yes, robots.txt is the bad way, I will try to use canonical tag. Thanks for your help!

        1 Reply Last reply Reply Quote 0
        • simon_realbuzz
          simon_realbuzz last edited by

          Using robots.txt is perhaps not the best way of doing it. Using the canonical or a noindex meta tag would likely be best. I think the reasons for this are best summed up in this article which explains, probably better than I could, why robots.txt is not the best way of dealing with duplicate content. Hope this helps.

          JohnHuynh 1 Reply Last reply Reply Quote 1
          • JohnHuynh
            JohnHuynh @simon_realbuzz last edited by

            I have tried to use cross-domain canonical, but this is too difficult for me. So, I want to confirm if I use the robots.txt file is ok or not?

            Thanks

            1 Reply Last reply Reply Quote 0
            • simon_realbuzz
              simon_realbuzz last edited by

              Why not use a cross-domain canonical whereby you reference the pages on your primary website as the canonical version on your secondary websites, thereby eliminating the duplication.

              For example on each page that is duplicate on your secondary website you would add the following to the head to reference the primary pages:

              JohnHuynh 1 Reply Last reply Reply Quote 2
              • 1 / 1
              • First post
                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

              • HonestSEOStudio

                How do I fix my portfolio causing duplicate content issues?

                Hi, Im new to this whole duplicate content issue. I have a website, fatcatpaperie.com that I use the portofolio feature in Wordpress as my gallery for all my wedding invitations.  I have a ton of duplicate content issues from this. I don't understand at all how to fix this. I'd appreciate any help! Below is an example of one duplicate content issue. They have slightly different names, different urls, different images and all have no text. But are coming up as duplicates. Would it be as easy as putting a different metadescription for each?? Thanks for the help! Rena | "Treasure" by Designers Fine Press - Fat Cat Paperie http://fatcatpaperie.com/portfolio-item/treasure-designers-fine-press 1 0 0 0 200 3 duplicates "Perennial" by Designers Fine Press - Fat Cat Paperie http://fatcatpaperie.com/portfolio-item/perennial-by-designers-fine-press 1 0 0 0 200 1 of 3 duplicates "Primrose" by Designers Fine Press - Fat Cat Paperie http://fatcatpaperie.com/portfolio-item/8675 1 0 0 0 200 2 of 3 duplicates "Catalina" by Designers Fine Press - Fat Cat Paperie http://fatcatpaperie.com/portfolio-item/catalina-designers-fine-press |

                On-Page Optimization | | HonestSEOStudio
                0
              • wearehappymedia

                Duplicate content with tagging and categories

                Hello, Moz is showing that a site has duplicate content - which appears to be because of tags and categories. It is a relatively new site, with only a few blog publications so far. This means that the same articles are displayed under a number of different tags and categories... Is this something I should worry about, or just wait until I have more content? The 'tag' and 'category' pages are not really pages I would expect or aim for anyone to find in google results anyway. Would be glad to here any advice / opinions on this Thanks!

                On-Page Optimization | | wearehappymedia
                1
              • neenor

                How to exclude URL filter searches in robots.txt

                When I look through my MOZ reports I can see it's included 'pages' which it shouldn't have included i.e. adding filtering rules such as this one http://www.mydomain.com/brands?color=364&manufacturer=505 How can I exclude all of these filters in the robots.txt? I think it'll be: Disallow: /*?color=$ Is that the correct syntax with the $ sign in it? Thanks!

                On-Page Optimization | | neenor
                0
              • LeahHutcheon

                Duplicate Content for Men's and Women's Version of Site

                So, we're a service where you can book different hairdressing services from a number of different salons (site being worked on). We're doing both a male and female version of the site on the same domain which users are can select between on the homepage. The differences are largely cosmetic (allowing the designers to be more creative and have a bit of fun and to also have dedicated male grooming landing pages), but I was wondering about duplicate pages. While most of the pages on each version of the site will be unique (i.e. [male service] in [location] vs [female service] in [location] with the female taking precedent when there are duplicates), what should we do about the likes of the "About" page? Pages like this would both be unique in wording but essentially offer the same information and does it make sense to to index two different "About" pages, even if the titles vary? My question is whether, for these duplicate pages, you would set the more popular one as the preferred version canonically, leave them both to be indexed or noindex the lesser version entirely? Hope this makes sense, thanks!

                On-Page Optimization | | LeahHutcheon
                0
              • bricerhodes

                How do i block an entire category/directory with robots.txt?

                Anyone has any idea how to block an entire product category, including all the products in that category using the robots.txt file? I'm using woocommerce in wordpress and i'd like to prevent bots from crawling every single one of products urls for now. The confusing part right now is that i have several different url structures linking to every single one of my products for example www.mystore.com/all-products, www.mystore.com/product-category, etc etc. I'm not really sure how i'd type it into the robots.txt file, or where to place the file. any help would be appreciated thanks

                On-Page Optimization | | bricerhodes
                0
              • Dino64

                Duplicate Content from on Competitor's site?

                I've recently discovered large blocks of content on a competitors site that has been copy and pasted from a client's site. From what I know, this will only hurt the competitor and not my client since my guy was the original. Is this true? Is there any risk to my client? Should we take action? Dino

                On-Page Optimization | | Dino64
                0
              • Adam-Perlman

                What's the best practice for handling duplicate content of product descriptions with a drop-shipper?

                We write our own product descriptions for merchandise we sell on our website.  However, we also work with drop-shippers, and some of them simply take our content and post it on their site (same photos, exact ad copy, etc...).  I'm concerned that we'll loose the value of our content because Google will consider it duplicated. We don't want the value of our content undermined... What's the best practice for avoiding any problems with Google? Thanks, Adam

                On-Page Optimization | | Adam-Perlman
                0
              • Gaveltek-173238

                Quick and easy Joomla 1.5 Duplicate content fix?

                www.massduitrialalwyers.com has a TON of duplicate content based on the way joomla 1.5 uses articles. Do you have a tried and true method to eliminate (automated would be preferred) the issues>? if not, might you suggest a plug in that takes care of the rel canonical?
                Cheers

                On-Page Optimization | | Gaveltek-173238
                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
              • Digital Marketers
              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.