{"id":40741,"date":"2025-10-22T15:52:38","date_gmt":"2025-10-22T13:52:38","guid":{"rendered":"https:\/\/csw.agency\/glossar\/canonical-tag\/"},"modified":"2025-10-23T12:16:08","modified_gmt":"2025-10-23T10:16:08","slug":"canonical-tag","status":"publish","type":"glossar","link":"https:\/\/csw.agency\/en\/glossar\/canonical-tag\/","title":{"rendered":"Canonical Tag"},"content":{"rendered":"<p>A canonical tag, also known as a canonical link or canonical URL, is a <a href=\"https:\/\/csw.agency\/en\/glossar\/html\/\">HTML element<\/a>, which is in the &lt;<code>head<\/code>&gt; area of a website. It indicates <a href=\"https:\/\/csw.agency\/en\/glossar\/search-engine-optimization-seo\/\">Search engines<\/a> The \u201eoriginal\u201c or \u201emain\u201c version of a page is the version that Google considers to be the \"original\" or \"main\" version of identical or very similar content. This tag is used with the attribute <code>rel=\"canonical\"<\/code> and refers to the preferred URL to be indexed.<\/p>\n<h2>The importance of the canonical tag for SEO<\/h2>\n<p>The primary function of the canonical tag is to solve problems with <a href=\"https:\/\/csw.agency\/en\/glossar\/duplicate-content\/\">Duplicate content<\/a> (duplicate content). Duplicate content occurs when the same or very similar content is accessible via different URLs. This can occur internally on your own domain or externally on several domains.<\/p>\n<p>Such duplicates can pose challenges for search engines:<\/p>\n<ul>\n<li><strong>Waste of resources<\/strong>: <a href=\"https:\/\/csw.agency\/en\/glossar\/crawling\/\">Crawler<\/a> have to search and index an unnecessarily large number of identical pages, which reduces the crawl budget.<\/li>\n<li><strong>Ranking dilution<\/strong>: If several pages have the same content, they share the \u201e<a href=\"https:\/\/csw.agency\/en\/glossar\/linkjuice\/\">Link power<\/a>\u201c and ranking signals instead of bundling them on a single, authoritative page. This can lead to poorer visibility in the <a href=\"https:\/\/csw.agency\/en\/glossar\/google-serps\/\">Search results<\/a> lead.<\/li>\n<li><strong>Incorrect indexing<\/strong>Search engines may have difficulty deciding which version of a page to display in search results, or even prioritize the \u201ewrong\u201c version.<\/li>\n<\/ul>\n<p>By using the canonical tag correctly, a webmaster clearly signals which URL represents the authoritative version of a piece of content. This ensures that search engines index this preferred URL, consolidate the link signals and display the desired page in the search results. This optimizes crawling, protects against potential ranking losses and improves the overall search engine optimization (SEO) of a website.<\/p>\n<h2>Implementation and use cases<\/h2>\n<p>The canonical tag is used in the <code>&lt;head&gt;<\/code>-area of the HTML document of a \u201ecopy\u201c page and refers to the \u201eoriginal\u201c page. An example of the implementation looks like this:<\/p>\n<pre><code>&lt;link rel=\"canonical\" href=\"https:\/\/www.ihredomain.de\/originalseite\/\" \/&gt;<\/code><\/pre>\n<p>It is crucial to specify only one canonical URL per page. If several canonical tags are found in the source text, they will be ignored by search engines. In addition, the canonical tag should always refer to an absolute URL and not to a URL that triggers a 404 status code.<\/p>\n<p>Common scenarios in which the canonical tag is used are:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/csw.agency\/en\/seo-for-online-stores\/\">Online stores<\/a><\/strong>Variants of products (e.g. different colors or sizes) that are accessible via separate URLs but have identical product descriptions.<\/li>\n<li><strong>URL parameters<\/strong>Pages with tracking codes, session IDs or filter options that lead to different URLs with the same content.<\/li>\n<li><strong>Technical duplicates<\/strong>If a website is accessed via different protocols (HTTP vs. HTTPS), subdomains (www. vs. without www.) or file names (e.g. <code>\/index.html<\/code>) can be reached.<\/li>\n<li><strong>Pagination<\/strong>: For paginated pages, it is usual to provide each page with a self-referencing canonical tag to prevent problems.<\/li>\n<li><strong>Cross-domain content<\/strong>: When publishing the same content on several domains, for example with <a href=\"https:\/\/csw.agency\/en\/build-backlinks\/\">Guest contributions<\/a> or syndication.<\/li>\n<\/ul>\n<p>Even if there is no obvious duplicate content, it is advisable to set a self-referencing canonical tag on each page. This signals <a href=\"https:\/\/csw.agency\/en\/google-and-artificial-intelligence\/\">Google<\/a> clearly identifies the preferred version and proactively protects against unintentional duplicates due to technical factors.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"_lmt_disableupdate":"no","_lmt_disable":"no","footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"class_list":["post-40741","glossar","type-glossar","status-publish","hentry","category-webdevelopment"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Canonical-Tag &#187; CSW.AGENCY<\/title>\n<meta name=\"description\" content=\"Ein Canonical Tag ist ein HTML-Element im -Bereich, das Suchmaschinen die Originalversion bei Duplicate Content anzeigt und SEO optimiert.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/csw.agency\/en\/glossar\/canonical-tag\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Canonical-Tag\" \/>\n<meta property=\"og:description\" content=\"Ein Canonical Tag ist ein HTML-Element im -Bereich, das Suchmaschinen die Originalversion bei Duplicate Content anzeigt und SEO optimiert.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/csw.agency\/en\/glossar\/canonical-tag\/\" \/>\n<meta property=\"og:site_name\" content=\"CSW.AGENCY\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-23T10:16:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/csw.agency\/wp-content\/uploads\/2024\/01\/CSW-53-scaled-2.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1707\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Canonical-Tag &#187; 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