What is Ads.txt? ads.txt  stands for Authorized Digital Sellers . It’s a simple text file placed on a website’s root domain  that tells advertisers which companies are allowed to sell that site’s advertising inventory . How ads.txt works? A website owner uploads a file called ads.txt  to the root of their domain. Example: https://example.com/ads.txt The file lists authorized ad networks or exchanges  allowed to sell the site's ads. Advertisers and DSPs check thi