--- title: Canonical URL description: Define a canonical url for similar or duplicate pages --- [Skip to content](https://support.sitemanager.io/en/seo/advanced/canonical-url#main-content) [![SiteManager Platform](https://support.sitemanager.io/hs-fs/hubfs/SM_Platform-logo.png?width=164&height=40&name=SM_Platform-logo.png)](https://support.sitemanager.io/en?hsLang=en) Open main navigation Close main navigation - [Go to sitemanager.io](https://www.sitemanager.io/) [Go to sitemanager.io](https://www.sitemanager.io/) How can we help? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://support.sitemanager.io/en?hsLang=en) 2. [SEO](https://support.sitemanager.io/en/seo?hsLang=en) 3. [Advanced](https://support.sitemanager.io/en/seo?hsLang=en#advanced) # Canonical URL ## Define a canonical url for similar or duplicate pages A canonical url defines the primary URL for a given page on your site when there are multiple versions. This way, search engines will know to index only the version you'd like your visitors to see. #### When does a search engine sees duplicated content? There are valid reasons why your site might have different URLs that point to the same page, or have duplicate or very similar pages at different URLs. Here are common examples: - To enable **dynamic URLs** with parameters: - https://www.mywebsite.com/articles - https://www.mywebsite.com/articles?lid=123 - https://www.mywebsite.com/articles?UTM\_campaign=fallCampaign -  same content for **www/non-www http/https** variants: - http://mywebsite.com/articles - https://mywebsite.com/articles - https://www.mywebsite.com/articles     Adding a Canonical URL 1. Go to your **page's properties** 2. Scroll down to **Advanced Settings** 3. Set Canonical Url to **active** 4. 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