Blog
What is Ads.txt
April 5, 2024
Sarah Carlson • Content Manager at AUTH 
Elevate transparency and security in advertising with ads.txt: A game-changer for publishers and buyers!
Picture this: each tree bore a clear signpost, guiding you to trusted partners with whom you could confidently transact. This is the pledge of ads.txt, offering publishers and distributors a reliable path to declare authorised vendors and guide programmatic buyers, fostering an environment of transparency and trust.
As the boundaries of the digital realms blur, the  launched an initiative designed to increase transparency and trust in the programmatic advertising ecosystem (including publishers, advertisers, and digital sellers alike).

Ads.txt, also known as Authorised Digital Sellers, is a simple, transparent and secure text file that is utilised by publishers to enumerate all digital sellers (including supply-side platforms (SSPs) and ad exchanges) they consider trustworthy and permit to sell their advertising inventory. 

Benefits include:
• Stopping unauthorised parties from selling your inventory.
• More control over who sells your ad space.
• Improved buyers confidence, due to legitimacy.


Despite the ads.txt initiative not being new, numerous publishers still hesitate to adopt it or lack knowledge and benefits that offer, which can potentially result in missed opportunity on improved transparency, control over inventory, and increased trust among advertisers.

Why is ads.txt important?
Statista’s estimates suggest that the expenses associated with global digital advertising fraud are projected to surge from 88 billion to 172 billion U.S. dollars over the five-year period spanning from 2023 to 2028 [Statista]
(Search Engine Land. (September 28, 2023). Estimated cost of digital advertising fraud worldwide in 2023 and 2028 (in billion U.S. dollars) [Graph]. In Statista. Retrieved April 03, 2024, from https://www.statista.com/statistics/677466/digital-ad-fraud-cost/)
(Search Engine Land. (September 28, 2023). Estimated cost of digital advertising fraud worldwide in 2023 and 2028 (in billion U.S. dollars) [Graph]. In Statista. Retrieved April 03, 2024, from https://www.statista.com/statistics/677466/digital-ad-fraud-cost/)

Ads.txt is crucial because it enhances transparency and trust in the digital advertising ecosystem. Publishers, are you taking the necessary steps to implement ads.txt and uphold industry integrity?[August 2022 Update: Version 1.1 of ads.txt/app-ads.txt introduces two additional values forpublishers to declare within their files: "OWNERDOMAIN" and "MANAGERDOMAIN".]