Specify a flexible range of inventory sizes in Ad Exchange

The flexible sizes feature will be deprecated soon and replaced with the Enable ad slot contraction in backfill network setting. Learn more

By default, Ad Exchange accepts some creatives that are smaller than the inventory size. Using the Flexible sizes rule type, you can manage how small of a creative you’re willing to accept, or opt out of accepting smaller sizes altogether. Flexible sizes make inventory and creatives more compatible with each other and enable more ads to compete for your inventory.

Flexible sizes:
  • Apply only to image or rich media ad types. Text ads continue to fill the entire available ad slot, as they always have. Mobile app interstitials follow a different set of rules and allow any size creative as long as it’s 50% of the screen width and 40% of the screen height.
  • Apply only to single-size Ad Exchange ad requests. If you have a multi-size Ad Exchange creative in Google Ad Manager that you set up to dynamically allocate to Ad Exchange, flexible sizes will not apply to those multi-size Ad Exchange ad requests. Instead, the list of sizes in the multi-size request provides the list of allowed creative sizes. However, a multi-size request to Ad Manager that triggers a single-sized Ad Exchange ad request will apply Flexible sizes rules. Learn more about the differences between flexible sizes and multi-size pricing.
  • Take priority over any size-related blocking rules. This means that inventory with a flexible size may allow a smaller, blocked creative to actually be trafficked in that ad slot. Learn more.

Manage flexible size settings

  1. Sign in to Google Ad Manager.
  2. Click Inventory and then Ad Exchange rules and then Flexible sizes.
  3. Navigate to the desired inventory type—for example, Display or Mobile app.
  4. The Default flexible sizes rule appears, along with any other existing flexible sizes rules.
    • The Default rule controls the flexible size settings for all of your inventory until new Flexible sizes rules are added. New rules then take precedence over the default rule.
    • If needed, click Default to update the default Flexible sizes rule.
  5. To add a flexible size rule, click New [inventory type] size setting near the top of the page.
    To edit an existing rule, click the rule name in the table.
  6. Name your flexible size rule.
  7. Enter a "Priority" for the rule.
    This number determines the order in which this flexible size rule is prioritized compared to others. The number must fall within the total number of flexible size rules (minus the default rule).
  8. Decide which inventory to include or exclude in your targeting.
    • Expand one of the targeting sections, such as "Inventory."
    • To include selections to the targeting criteria, hover over the item and click Include Done.
    • To exclude selections in the targeting criteria, hover over the item and click Exclude Block.
    • The selected items appear in the right column of the targeting table.
    • To remove a selection, click Remove Remove to the right of the selection.  
  9. Manage the flexible size setting under “Smaller creatives”:
    • The recommended default is to Allow creatives that are smaller than the inventory size. When the creative is smaller, we center-align it horizontally and top-align it vertically. The empty space in the ad slot is transparent.
    • If you want to only enable creatives that are same size as the slot, select Do not allow creatives that are smaller than the inventory size. No further action is necessary to specify ad sizes.
  10. If you allowed smaller creatives in the previous step, you’ll next be able to specify how small of a creative you’re willing to serve. You can either:
    • Use system recommended minimum width and height: With the default option, Ad Exchange controls which creative sizes may serve into an ad slot. We recommend publishers use the system-recommended setting to maximize yield.
    • Set custom minimum width and height: To choose the smallest creative you’re willing to serve in this ad slot, in terms of a percentage of the inventory width and height, enter the values in the “%” fields or use the sliders to select a percentage. With this option, you can also choose to "Remove space surrounding the creative."
  11. Click Save.
    The new flexible size setting appears in the table.

Examples of available smaller creatives

The following images show the relationship between inventory sizes you included and the creative sizes that fit based on the range you selected. In this example, the publisher:

  • Selected the option to Allow creatives that are smaller than the inventory size.
  • Set a custom minimum width and height of 67% of the inventory width and height.

For each image:

  • There’s a list of common creative sizes (1 in the first image below) that will fit in the selected range.
  • The outer gray box (2) shows the inventory size.
  • The box formed by the gray diagonal lines (3) is the minimum allowed creative based on the selected range.
  • The blue box (4) shows the common creative sizes listed in blue bold numbers.
  • The white space (5) indicates the area of the ad slot that remains empty when the slot is populated with a smaller creative.

Deactivate a flexible size setting

In the table of flexible size settings, under the "Status" column, change the value to Inactive. Deactivating a flexible size setting means it will no longer apply to inventory. You can change the value back to Active at any time.

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