Show 300×250 and 300×600 Ads in One Unit

DoubleClick For Publishers / Google Ad Manager Ad Optimization
Last updated: September 19, 2019 | by Kean Graham

This post was most recently updated on September 19th, 2019

If you run just one ad size in any given ad unit, you might be missing out on some of the more profitable ads. For example, if you only show 300×250 and 300×600 ads in one unit, you might be missing out on some lucrative 300×250 ads buyers wish to display. The opposite holds true if you’re only running 300×250 ads in prime real estate.

By displaying both 300×600 and 300×250 ones in one unit, you’ll be able to dramatically increase the ads that will run in one spot. There’s a catch, though: right now, this method only works Doubleclick for Publisher’s ads. Even with this limitation, though, this is a prime example of how you can increase your ad monetization with just a little craftiness and creativity.

This trick will work with any ad sizes that share one dimension (e.g., 300×250 and 250×250, 120×90 and 120×60, or 120×600 and 120×240).

Here’s how to run two different ad sizes in one unit:

  1. In DFP, define an ad unit for 300×250. Generate the tags and put the code onto your site just as you would do if you were only going to run 300×250 ads. Before putting the code into your site, however, remove the hard-coded ad size information so the tag does not specify a height or a width.
  2. Create an order for a 300×600 ad. Set the inventory size to 300×250.
  3. Target this ad to the 300×250 ad unit.
  4. Upload a 300×600 creative to the order from step 2 and check the box that says, “Allow creative size to differ from ad unit size”.

Once you’ve set up this ad unit, your ad will flip between 300×600 and 300×250 ads based on DFP’s own internal algorithms. This trick will help ensure that you are running the most ideal mix of ad sizes on your site.

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