Glossary/Programmatic/Ad verification
What is ad verification and how does it work?
What ad verification measures, how the tools work, and how publishers keep their numbers clean.
Written by Samhub with the help of AI·Updated 13 Oct 2026·3 min readAd verification is independent checking that ads ran as agreed: seen by real people, in a suitable environment, in the right places.
What verification measures
| Check | Question |
|---|---|
| Viewability | Was the ad visible? |
| Invalid traffic | Was it a real person? |
| Brand safety | Was the content suitable? |
| Geography | Was it shown in the right country? |
How it works
The buyer adds a small script or tag to the ad. It reports what happened when the ad loaded, and can block the ad on pages that fail the buyer’s rules.
16 pages for publishers, with a checklist for data, programmatic and direct sales.
How publishers prepare
Know your numbers
Measure viewability and invalid traffic yourself.
Fix weak units
Remove or move ad units that are rarely seen.
Compare reports
Agree which tool counts before the campaign.
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Frequently asked questions
Usually the advertiser or agency.
Small gaps are normal. Agree a tolerance in the deal.
Extra scripts add some weight. Server-side checks reduce this.
Brand safety is one part of verification.
Related terms
Whether an ad had a real chance to be seen.
Impressions and clicks not made by real, interested people.
Keeping ads away from harmful content.
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