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What is Ads.txt?
Ads.txt that stands for Authorized Digital Sellers, allows publishers to sell their advertising inventory through sellers that they identified as authorized.
What is Ads.txt and why does it matter for publishers?
Ads.txt (Authorized Digital Sellers) is a file publishers host on their domain to declare which sellers are authorized to sell their advertising inventory. It gives publishers direct control over who can sell their ads and prevents counterfeit inventory from being offered to advertisers. The format was defined by the IAB Tech Lab.
By providing transparency across the supply chain, Ads.txt helps publishers attract greater advertiser demand — budget that would otherwise be lost to counterfeit inventory.
How do you set up and maintain your Ads.txt file with Opti Digital?
During onboarding, Opti Digital provides all the required Ads.txt lines for the SSPs being connected to your inventory. Follow these steps to keep your file current:
- Add the SSP lines provided by Opti Digital to your
Ads.txtfile during onboarding. - Update the file each time partners are added or removed — SSPs crawl
Ads.txtregularly, and any missing partner will be excluded from programmatic auctions. - Use the free Adstxt.guru tool to audit your file and identify missing or outdated entries.
Opti Digital monitors your Ads.txt file regularly and will notify you when updates are required.