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ads.txt

Also: Authorized Digital Sellers; app-ads.txt

An IAB Tech Lab standard in which a publisher lists, in a plain text file at its domain root, every company authorized to sell its inventory. Buyers check bid requests against the file to reject unauthorized resale and domain spoofing. app-ads.txt is the mobile and CTV version, referenced from the app store listing. sellers.json is the seller-side counterpart.

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Cite this entry: Agency Echelon. "ads.txt." Agency Echelon Reference, reviewed September 2026. https://agencyechelon.com/reference/glossary/ads-txt/

Reference

A reference library for digital advertising, written and reviewed by the Agency Echelon team. Free to read. No advertising, no sponsorship, no affiliate links, no email gate.

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Reviewed September 23, 2026. Reference text is licensed CC BY 4.0. Privacy