The Winning Creative Has a Different Size than the Ad Request. Follow These Steps To Fix It.

The creative serving is not the same size as the one requested.


Step 1: Log into Ad Manager > Inventory > Ad Units

Step 2: Search for the ad unit/s and check if you have the correct size/s in the settings. Edit and make corrections if necessary.

Ad Unit size

Step 3: If you have Managed Demand or a tag-based setup (outside of header bidding), audit the creatives to make sure they are configured with the right size.

Step 4: Cross-check the ad sizes configured for each ad unit versus the sizes in Ad Manager

ad unit code

Step 5: If you have an ON-page setup, audit the sizes defined in your source code. Make the corrections if necessary.

source code

Step 6: If you have Size Mapping enabled, add the relevant Bidder-level size/s in your Header Bidding configuration:


Step 7: Audit the Placement ID’s or parameters configured for each bidder to make sure they match the Ad Unit sizes.


Step 8: Re-run PubGuru Ad Inspector after making changes and see if the error persists. If yes:

For some bidders, you can log into their user interface and check the settings.

ad unit placement details

If unable to do so, reach out to your representative to have them re-check.

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