Create an ad unit

Create the basic unit of inventory in Ad Manager. It’s the space where ads can be delivered.

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  1. Sign in to Google Ad Manager.
  2. Click Inventory and then Ad units.
  3. You can create ad units with up to 2 levels of organizational hierarchy (or 5 levels in Google Ad Manager 360). In the box that shows existing ad units:
    • Select the ad unit where you want the new ad unit to appear in the hierarchy.
    • If you don’t select an ad unit, the new ad unit will be at the top level.
  4. Click New ad unit and select:
    • One level below... to create an ad unit below a selected ad unit.
    • Current level to create an ad unit at the same hierarchy level as a selected ad unit.
  5. Enter Code to identify the ad unit in the associated ad tag. It can't be changed later.
    • Create a code that's easy to identify (e.g., News_International_BoxATF or Leaderboard_BTF).
    • You can only reuse codes on different ad unit levels (e.g., you can reuse home at mysite_economy_home and mysite_weather_home).
  6. Enter a Name and Description (Optional)  for the ad unit. It’s helpful to include information about the ad unit's location in the name.
  7. Set Sizes. (Optional) 

    You can add multiple sizes to be associated with an ad unit. Adding sizes helps traffickers filter by size when adding ad units to targeting in a line item. Sizes specified don't affect ad serving.

    • Select Fixed size to define a list of sizes for creatives you expect this ad unit to serve. Include the Out-of-page size for creatives that don’t fit in a traditional banner space or browser window (for example, pop-ups, floating line items, and interstitials). Include the Fluid size if the ad unit is to be used for native ads.
    • Select Smart Banner if the ad unit is for a mobile app and you want the ad unit to have a fixed height but fill the width of the screen.

    Want to add a new size to your network?

    Create a new ad unit and add the new size, or add the new size to the list of sizes assigned to an existing ad unit. As long as a size is defined in at least one ad unit or line item, it can be used elsewhere in your network.

  8. (Not applicable to Ad Exchange tags) Define a target window, which sets the target attribute of the ad's click-through link to tell the browser where to open the ad's landing page.
    • _top: The landing page will load in the full body of the window, breaking out of any framesets.
    • _blank: The landing page will open in a new, unnamed window.
    This selection follows the default target window set in the network-level inventory settings. If the ad unit is in a mobile app, the target window is ignored. For Android and iOS apps, ads load in a new, unnamed browser window.
  9. Help content for advanced users (Advanced, not applicable to Ad Exchange tags) Add these optional features and settings to the ad unit as needed.
    • Placements: Click include next to one or more placement names to associate your new ad unit.
    • Special ad unit: Requires traffickers to explicitly target the ad unit for line items to serve.

      Only available in Google Ad Manager 360.

    • Label frequency caps (renamed from "Ad unit frequency caps"): Click Add a labeling rule to limit the number of impressions displayed to users for creatives that share the defined labels.
    • Refresh rate: For mobile app inventory, set a refresh rate to determine how often a new ad impression is generated. If you select Refresh rate in seconds, Google Ad Manager auto-populates a value of 60, which you can change to any value between 30 and 120 seconds.
    • Labels: Add labels to the ad unit so that creative wrappers can be applied when creatives are served to the ad unit.
    • Teams: If your network uses Teams, associate this ad unit to restrict access.
  10. Click Save.

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