Transparency
ads.txt
ads.txt is an IAB Tech Lab transparency standard that lets publishers publicly declare which advertising systems are authorized to sell or resell their digital inventory.
Buyers can use ads.txt declarations as one signal for validating authorized supply paths and reducing exposure to unauthorized inventory representations.
How it works
- A publisher hosts an ads.txt file on its domain.
- Each record identifies an advertising system, seller account and relationship type.
- Buyers and intermediaries crawl or ingest the file for supply validation.
Also known as
Authorized Digital Sellers
Frequently asked questions
Does ads.txt prove that every impression is legitimate?
No. It is an authorization signal and should be combined with other supply-chain, quality and fraud checks.
Where is ads.txt normally published?
For web inventory it is normally available from the publisher domain at the standardized ads.txt path.