Specify a flexible range of inventory sizes in Ad Exchange

By default, DoubleClick 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.

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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.
  • Apply only to single-size Ad Exchange ad requests. If you have a multi-size Ad Exchange creative in DoubleClick for Publishers 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 DFP 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 the flexible size settings

  1. Sign in to DoubleClick for Publishers.
  2. Click Inventory and then Ad Exchange rules and then Flexible sizes.
    If you're accessing this feature from Ad Exchange instead of DFP, click Rules and then Flexible sizes.
  3. The Display sub-tab is selected by default.
    To add a flexible sizes rule for apps, click the Mobile In-App sub-tab.
  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 Edit to update the default Flexible sizes rule. For example, to opt out of accepting any smaller creatives, select Do not allow creatives that are smaller than the inventory size. See step 6 for more information about these settings.
  5. To add a rule, click New rule near the top of the page.
    To edit an existing rule, click Edit to the right of the rule name in the table.
  6. Use the inventory selector to identify the desired inventory segments, as you would with any other rule type (e.g., blocking, pricing rules, etc.).
  7. Manage the flexible size settings in the “Allow smaller creatives” section (see image below):
    • The recommended default is to Allow creatives that are smaller than the inventory size (A). 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 (B). No further action is necessary to specify ad sizes.
  8. If you allowed smaller creatives in step 5, 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 (C): 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 (D): 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 (E) or use the sliders (F) to select a percentage.
      If it’s a custom inventory size, make sure to set a generous minimum width and height so that enough creative sizes are eligible to be displayed. For example, if you’re using a 980x300 ad unit, setting the minimum width to 98% or lower and the minimum height to 83% or lower enables the ad slot to accept standard 970x250 demand.

The “Preview” section shows examples of the relationship between the inventory sizes you included and the creative sizes that fit based on the range you selected.

  • Each included inventory size has its own preview (G).
  • The preview lists some common creative sizes (H) that will fit in the selected range.
  • The outer gray box (I) shows the inventory size.
  • The box formed by the gray diagonal lines (J) is the minimum allowed creative size based on the selected range.
  • The blue table (K) shows the creative size you’re hovering over with your mouse in the list (H). Hover with your mouse over different sizes to see how they will fit in the ad slot.
  • The white space (L) indicates the area of the ad slot that remains empty when the slot is populated with a smaller creative.

Flexible sizes take priority over size blocking rules in Ad Exchange

In Ad Exchange, when you use flexible sizes to specify a range of creative sizes that a segment of your inventory will accept, this range will 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.

For example:

  1. You set up a blocking rule that excludes creatives with a size of 300x50.
  2. You set up a flexible inventory size of 468x80 with a minimum creative width of 60% and a minimum creative height of 60%.
  3. As the “Preview” section indicates, the minimum allowed size is 280x36. Therefore, 300x50 is a size that fits within the flexible size threshold for the ad slot.
  4. Even though you blocked the size of 300x50 in step 1, because the flexible inventory size from step 2 allows 300x50 creatives, those creatives may appear in the 468x80 ad slot.

To ensure that sizes remain blocked, make sure that all flexible size ranges are bigger than the blocked size. In the above example, if you:

  • Change the flexible range for 468x80 to a minimum creative width of 80% and a minimum creative height of 80%.

The 300x50 size will fall below the minimum range of 374x64, and therefore continue to be blocked.

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