{"id":3945,"date":"2026-07-18T08:00:00","date_gmt":"2026-07-18T08:00:00","guid":{"rendered":"https:\/\/www.pricefy.io\/articles\/?p=3945"},"modified":"2026-07-18T08:00:00","modified_gmt":"2026-07-18T08:00:00","slug":"product-identifiers","status":"publish","type":"post","link":"https:\/\/www.pricefy.io\/articles\/product-identifiers","title":{"rendered":"GTIN, UPC, EAN, MPN &#038; ASIN: Product Identifiers Explained (2026)"},"content":{"rendered":"<p>Product identifiers \u2014 <strong>GTIN, UPC, EAN, ISBN, MPN and ASIN<\/strong> \u2014 are the connective tissue of ecommerce: the codes that tell Google, Amazon, eBay and every comparison engine <em>which product<\/em> your listing actually is. Get them right and your products match, rank and monitor cleanly everywhere; get them wrong and you inherit rejected feeds, mismatched listings and invisible offers. After fifteen years working with product catalogs, identifiers are the first thing I audit \u2014 because every other data problem hides behind them. Here&#8217;s what each identifier means, how they relate (the GTIN\/UPC\/EAN confusion ends today), which channels require which, and how to get codes for your own products.<\/p>\n<h2 id=\"toc\">What you&#8217;ll find in this guide<\/h2>\n<ul>\n<li><a href=\"#gtin\">What is a GTIN?<\/a><\/li>\n<li><a href=\"#each\">The identifiers, one by one<\/a><\/li>\n<li><a href=\"#vs\">GTIN vs UPC vs EAN: how they relate<\/a><\/li>\n<li><a href=\"#channels\">Which channels require which identifiers<\/a><\/li>\n<li><a href=\"#get\">How to get identifiers for your products<\/a><\/li>\n<li><a href=\"#faq\">Frequently asked questions<\/a><\/li>\n<\/ul>\n<h2 id=\"gtin\">What is a GTIN?<\/h2>\n<p>GTIN stands for <strong>Global Trade Item Number<\/strong> \u2014 the GS1 standard that underpins nearly every product barcode on Earth. The key thing to understand is that GTIN is a <em>family name<\/em>, not a separate code: a UPC is a GTIN, an EAN is a GTIN, just in different lengths. The family has four members \u2014 GTIN-8 (short EAN for tiny packages), GTIN-12 (the North American UPC), GTIN-13 (the international EAN) and GTIN-14 (case and multipack packaging levels). When a channel like Google asks for a &#8220;GTIN&#8221;, it&#8217;s asking for whichever of these your product legitimately carries.<\/p>\n<p>GTINs are issued through <strong>GS1<\/strong>, the global standards body \u2014 which matters, because a GTIN is only as trustworthy as its source. Codes bought from cut-rate &#8220;barcode resellers&#8221; often trace back to someone else&#8217;s GS1 prefix, and marketplaces increasingly validate ownership.<\/p>\n<h2 id=\"each\">The identifiers, one by one<\/h2>\n<table style=\"width:100%; border-collapse:collapse; margin:24px 0; font-size:15px; line-height:1.5; border:1px solid #D7E6F7; border-radius:8px; overflow:hidden;\">\n<thead>\n<tr>\n<th style=\"background-color:#EAF2FB; color:#1A3E6F; text-align:left; padding:12px 16px; border-bottom:2px solid #C7DBF3; font-weight:600;\">Identifier<\/th>\n<th style=\"background-color:#EAF2FB; color:#1A3E6F; text-align:left; padding:12px 16px; border-bottom:2px solid #C7DBF3; font-weight:600;\">Format<\/th>\n<th style=\"background-color:#EAF2FB; color:#1A3E6F; text-align:left; padding:12px 16px; border-bottom:2px solid #C7DBF3; font-weight:600;\">Issued by<\/th>\n<th style=\"background-color:#EAF2FB; color:#1A3E6F; text-align:left; padding:12px 16px; border-bottom:2px solid #C7DBF3; font-weight:600;\">Where it rules<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color:#FFFFFF;\">\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\"><strong>GTIN<\/strong><\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">8, 12, 13 or 14 digits<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">GS1<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">The umbrella \u2014 every barcode below is a GTIN<\/td>\n<\/tr>\n<tr style=\"background-color:#F5F9FE;\">\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\"><strong>UPC<\/strong><\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">12 digits (GTIN-12)<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">GS1 US<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">North American retail<\/td>\n<\/tr>\n<tr style=\"background-color:#FFFFFF;\">\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\"><strong>EAN<\/strong><\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">13 digits (GTIN-13)<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">GS1 (national offices)<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Europe and international retail<\/td>\n<\/tr>\n<tr style=\"background-color:#F5F9FE;\">\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\"><strong>ISBN<\/strong><\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">13 digits (was 10)<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">ISBN agencies<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Books \u2014 and it doubles as the book&#8217;s ASIN<\/td>\n<\/tr>\n<tr style=\"background-color:#FFFFFF;\">\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\"><strong>MPN<\/strong><\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Manufacturer&#8217;s own format<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">The manufacturer<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Parts &amp; products without retail barcodes; paired with brand<\/td>\n<\/tr>\n<tr style=\"background-color:#F5F9FE;\">\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\"><strong>ASIN<\/strong><\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">10 characters<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Amazon<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Amazon&#8217;s catalog only<\/td>\n<\/tr>\n<tr style=\"background-color:#FFFFFF;\">\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\"><strong>SKU<\/strong><\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Whatever you like<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">You<\/td>\n<td style=\"padding:12px 16px; border-bottom:1px solid #E9F1FB; color:#243B53;\">Your own systems \u2014 never a global identifier<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>MPN<\/strong> deserves one extra beat, because it&#8217;s the most misunderstood of the set: the manufacturer part number is whatever code the maker stamped on the product \u2014 no global registry, no fixed format. It only identifies a product reliably when <em>paired with the brand<\/em>, which is exactly how channels ask for it (&#8220;brand + MPN&#8221;) when a GTIN doesn&#8217;t exist. <strong>ASIN<\/strong> is the other special case \u2014 Amazon&#8217;s internal page ID rather than a portable code; we unpack it fully in our <a href=\"https:\/\/www.pricefy.io\/articles\/amazon-asin\">Amazon ASIN guide<\/a>.<\/p>\n<h2 id=\"vs\">GTIN vs UPC vs EAN: how they relate<\/h2>\n<p>The confusion dissolves with one sentence: <strong>UPC and EAN aren&#8217;t alternatives to GTIN \u2014 they&#8217;re kinds of GTIN.<\/strong> A 12-digit UPC is a GTIN-12; a 13-digit EAN is a GTIN-13; and any UPC can be written as an EAN by adding a leading zero. So when Google&#8217;s spec asks for <code>gtin<\/code>, your existing UPC or EAN goes straight in \u2014 no conversion, no separate code to buy. And there&#8217;s no such thing as &#8220;converting an ASIN to a UPC&#8221;: a product&#8217;s Amazon page simply lists both, because they&#8217;re different systems pointing at the same item.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.pricefy.io\/articles\/wp-content\/uploads\/2026\/07\/identifiers-map.jpg\" alt=\"GTIN vs UPC vs EAN: UPC and EAN are kinds of GTIN, alongside ISBN, MPN, ASIN and SKU\" \/><\/p>\n<h2 id=\"channels\">Which channels require which identifiers<\/h2>\n<ul>\n<li><strong>Google Shopping<\/strong> asks for <code>gtin<\/code> plus <code>brand<\/code> (and <code>mpn<\/code> where no GTIN exists), with <code>identifier_exists<\/code> for products that genuinely have none \u2014 details in the <a href=\"https:\/\/www.pricefy.io\/feed-channels\/google-shopping\">Google Shopping feed spec<\/a>. Correct identifiers drive matching and eligibility.<\/li>\n<li><strong>Amazon<\/strong> requires a GTIN (UPC\/EAN) to create a new listing \u2014 that&#8217;s how it decides whether your product already exists as an ASIN or needs one \u2014 unless you hold a GTIN exemption.<\/li>\n<li><strong>eBay<\/strong> uses identifiers in item specifics; branded new products increasingly need them to list well, as we cover in <a href=\"https:\/\/www.pricefy.io\/articles\/how-to-sell-on-ebay\">how to sell on eBay<\/a>.<\/li>\n<li><strong>Comparison engines and marketplaces<\/strong> (idealo, Bol, Fnac, OnBuy\u2026) match offers to product pages by EAN \u2014 no identifier, no match, no listing.<\/li>\n<\/ul>\n<p>There&#8217;s a second, underrated payoff: identifiers are what make your catalog <em>comparable<\/em>. Matching your products to competitors&#8217; offers across the market \u2014 the foundation of price monitoring \u2014 runs on GTINs, which is why <a href=\"https:\/\/www.pricefy.io\/features\/products-automatch\">product matching<\/a> gets dramatically more accurate the moment your identifier coverage is complete.<\/p>\n<h2 id=\"get\">How to get identifiers for your products<\/h2>\n<ol>\n<li><strong>GTINs (UPC\/EAN): license them from GS1.<\/strong> Join your national GS1 office, get a company prefix, assign codes per product. Avoid third-party &#8220;cheap barcode&#8221; resellers \u2014 marketplaces validate GTIN ownership against GS1 data, and recycled codes cause listing rejections. Practical walkthrough: <a href=\"https:\/\/www.pricefy.io\/articles\/how-to-generate-ean-codes-for-your-business\">how to generate EAN codes for your business<\/a>.<\/li>\n<li><strong>MPN: it comes from the manufacturer.<\/strong> If you make the product, define a stable internal part-numbering scheme and publish it; if you resell, copy the maker&#8217;s MPN exactly.<\/li>\n<li><strong>ASIN: Amazon assigns it.<\/strong> You never buy an ASIN \u2014 you match an existing one or create a listing (with your GTIN) and receive one.<\/li>\n<li><strong>No barcode, legitimately? Use the exemptions.<\/strong> Handmade, private-label and certain categories can apply for Amazon&#8217;s GTIN exemption, and Google&#8217;s <code>identifier_exists<\/code> attribute covers the same case in feeds. Exemptions are for products that truly have no codes \u2014 not a shortcut to skip GS1.<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"https:\/\/www.pricefy.io\/articles\/wp-content\/uploads\/2026\/07\/identifiers-get.jpg\" alt=\"How to get product identifiers: GS1 for GTINs, manufacturer MPNs, Amazon-assigned ASINs and GTIN exemptions\" \/><\/p>\n<h2 id=\"faq\">Frequently asked questions<\/h2>\n<h3>What does GTIN stand for?<\/h3>\n<p>Global Trade Item Number \u2014 the GS1 family of product codes that includes UPC (GTIN-12), EAN (GTIN-13), GTIN-8 and GTIN-14.<\/p>\n<h3>Is a UPC the same as a GTIN?<\/h3>\n<p>A UPC is one kind of GTIN \u2014 the 12-digit North American version. Every UPC is a GTIN; not every GTIN is a UPC. Channels that ask for a GTIN accept your UPC or EAN as-is.<\/p>\n<h3>What&#8217;s the difference between GTIN and MPN?<\/h3>\n<p>A GTIN is a globally registered retail code issued via GS1; an MPN is the manufacturer&#8217;s own part number with no central registry. Channels prefer GTINs and fall back to brand + MPN when no GTIN exists.<\/p>\n<h3>Do I need a GTIN to sell online?<\/h3>\n<p>For branded new products on major channels, effectively yes \u2014 Google wants it in the feed and Amazon wants it to create listings. Genuine no-barcode products (handmade, private label) can use Amazon&#8217;s GTIN exemption and Google&#8217;s identifier_exists instead.<\/p>\n<h3>Can I look up what product a GTIN belongs to?<\/h3>\n<p>Yes \u2014 GS1&#8217;s own verification service checks who a barcode is registered to, and typing a GTIN into Google or a marketplace usually surfaces the product. That&#8217;s also how channels catch reused or unowned codes.<\/p>\n<p>Identifiers are boring exactly the way plumbing is boring \u2014 invisible until they&#8217;re wrong, and everything depends on them. Audit your GTIN coverage this week, fix the gaps at the source, and every feed, listing and <a href=\"https:\/\/www.pricefy.io\/features\/products-automatch\">price comparison<\/a> downstream gets more accurate for free.<\/p>\n","protected":false},"excerpt":{"rendered":"What GTIN, UPC, EAN, ISBN, MPN and ASIN mean, how they relate, which channels require which \u2014 and how to get identifiers (or an exemption) for your products.","protected":false},"author":1,"featured_media":3942,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"csco_display_header_overlay":false,"csco_singular_sidebar":"","csco_page_header_type":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-3945","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-platforms","8":"cs-entry"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"What GTIN, UPC, EAN, ISBN, MPN and ASIN mean, how they relate, which channels require which \u2014 and how to get identifiers (or an exemption) for your products.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Paul Morello\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.pricefy.io\/articles\/product-identifiers\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Pricefy Blog - Dynamic Pricing, Competitors Analysis, Everything You Need To Outsmart Your Competitors\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"GTIN, UPC, EAN, MPN &amp; 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