Validate your site's ads.txt file presence, formatting, and seller setup in real-time. This free tool parses ads.txt lines, checks entry formats (detecting comma discrepancies or incorrect fields), and confirms whether major ad network publishers are direct or reseller relationships.
The Authorized Digital Sellers (ads.txt) initiative is an IAB-approved standard that prevents domain spoofing and ad fraud. By placing a valid ads.txt file at the root of a domain, publishers declare exactly who is authorized to sell their digital advertising inventory. Ad networks like Google AdSense, Google Ad Manager, and Rubicon crawl this file. If the ads.txt file is missing, misconfigured, or has syntax errors, advertisers will withdraw bids, leading to severe drop-offs in ad monetization revenue.