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The Google Publisher Tag (GPT) is an ad tagging library for Google Ad Manager.

You can use GPT to dynamically build ad requests. GPT takes key details like the ad unit code, ad size, and custom targeting, builds the request, and displays the ad on web pages.

For more details on GPT, see the Ad Manager help center.

Here are some samples you can use to get started with GPT. If you need more help with GPT, see the support options.

Display a test ad

The following example walks you through creating a test page that uses GPT to load a generic ad from Google's test network.

Full code for this example can be found on the display a test ad sample page.

  1. Create a basic HTML document

    In a text editor, create a basic HTML document called hello-gpt.html.

    <!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta name="description" content="Display a fixed-sized test ad." />
    <title>Display a test ad</title>
    <style></style>
  </head>
  <body>
  </body>
</html>

  2. Load the GPT library

    Load the GPT library by adding the following to the <head> of the HTML document.

    This code loads the GPT library from https://securepubads.g.doubleclick.net/tag/js/gpt.js. Once the library has fully loaded, it processes any queued commands in the googletag object.

    Important: Only load GPT from a Google domain. 
    <head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <meta name="description" content="Display a fixed-sized test ad." />
  <title>Display a test ad</title>
  <script
    async
    src="https://securepubads.g.doubleclick.net/tag/js/gpt.js"
    crossorigin="anonymous"
  ></script>
  <style></style>
</head>

  3. Define an ad slot

    Define an ad slot and initialize GPT using the googletag.enableServices() method.

    This code first ensures the googletag object is available, then queues a command which constructs an ad slot and enables GPT.

    The ad slot in this example will load an ad of size 300x250 from the ad unit specified by path /6355419/Travel/Europe/France/Paris. The ad will be displayed in a <div id="banner-ad"> element in the body of the page, which will be added next.

    Ad unit path follows the format /network-code/[parent-ad-unit-code/.../]ad-unit-code, where:

    • network-code is a unique identifier for the Ad Manager network the ad unit belongs to
    • parent-ad-unit-code are the codes of all parent ad units (only applies to non-top level ad units)
    • ad-unit-code is the code for the ad unit to be displayed

    Note that all ad unit codes included in the ad unit path must adhere to the formatting rules specified by Ad Manager. 

    <head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <meta name="description" content="Display a fixed-sized test ad." />
  <title>Display a test ad</title>
  <script
    async
    src="https://securepubads.g.doubleclick.net/tag/js/gpt.js"
    crossorigin="anonymous"
  ></script>
  <script>
    window.googletag = window.googletag || { cmd: [] };

    googletag.cmd.push(() => {
      // Define an ad slot for div with id "banner-ad".
      googletag
        .defineSlot("/6355419/Travel/Europe/France/Paris", [300, 250], "banner-ad")
        .addService(googletag.pubads());

      // Enable the PubAdsService.
      googletag.enableServices();
    });
  </script>
  <style></style>
</head>

  4. Specify where the ad will appear

    Specify where the ad will appear on the page by adding the following code to the <body> of the HTML document.

    Note that the ID of this <div> matches the ID specified when defining the ad slot.

    <body>
  <div id="banner-ad" ></div>
  <script>
    googletag.cmd.push(() => {
      // Request and render an ad for the "banner-ad" slot.
      googletag.display("banner-ad");
    });
  </script>
</body>

  5. Preview the test page

    Save the hello-gpt.html file and open it in a web browser. Once loaded, the page will display a test ad in the body of the web page.

    Caution: If you dont see an ad, ensure that the div ID specified in the <head> of the page matches the ID of the <div> element you added to the <body> of the page.

Display your own ad

To display your own ad, use the hello-gpt.html file from Display a test ad, then replace the code in the header with code specifying inventory from your own Ad Manager network.

Note: Before you can display an ad from your Ad Manager network, you need to make sure there's an active line item already trafficked in the "Ready" status. Learn more about creating line items in the Ad Manager help center.

  1. Generate an ad tag for the ad unit you'd like to display. Learn more about generating ad tags in the Ad Manager help center.

  2. Copy the ad tag code provided in the Document header section and use it to replace the corresponding code in the <head> of your HTML document.

    Caution: ensure that the width, height, and ID of the <div> declared in the body of the page matches the width, height, and ID of the ad slot defined in the ad tag code.
    <head>
  <meta charset="utf-8">
  <title>Hello GPT</title>
  <script src="https://securepubads.g.doubleclick.net/tag/js/gpt.js" crossorigin="anonymous" async></script>
  <script>
    window.googletag = window.googletag || {cmd: []};
    googletag.cmd.push(function() {
      googletag
          .defineSlot("ad-unit-path", [width, height], "div-id")
          .addService(googletag.pubads());
      googletag.enableServices();
    });
  </script>
</head>

  3. Save the updated hello-gpt.html file and open it in a web browser.

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Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-02-03 UTC.

Need to tell us more? [[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-03 UTC."],[],["GPT, a Google Ad Manager tagging library, dynamically builds ad requests. To display a test ad, create an HTML file, load the GPT library, and define an ad slot with `googletag.defineSlot()`, including the ad unit path (e.g., `/6355419/Travel/Europe/France/Paris`) and dimensions. Enable GPT with `googletag.enableServices()`. Add a `\u003cdiv\u003e` element to the body matching the slot's ID and use `googletag.display()` to render the ad. Replace test ad details with your Ad Manager network's ad tag to show your ads.\n"]]
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