Ads.txt Tester

Ads.txt Tester analyzes a domain's ads.txt file to confirm that listed sellers are authorized to sell that domain's inventory. It targets ad ops teams, publishers, and compliance staff responsible for inventory integrity and programmatic revenue. The tool is designed for onboarding checks, routine audits, and rapid investigations after supply-chain changes.

Conceptually, the tool fetches the domain's root ads.txt, parses each line into fields (domain, seller account, account_id, and relation_type), validates syntax against the IAB Tech Lab spec, and flags entries with missing fields, invalid values, or suspicious listings. It aggregates results into a structured, machine-readable report.

Unique value comes from automated line-level validation, duplicate detection, and exportable outputs in JSON or CSV that support CI pipelines and archival records. It provides a per-entry status, a confidence score, and guidance to remediate issues, which differentiates it from generic text parsers.

Use cases include publishers verifying onboarding accuracy, ad-tech teams monitoring changes after site updates, and agencies confirming transparency for advertisers and partners. The tool reduces misconfigurations, improves revenue certainty, and helps meet industry standards and regulatory expectations around inventory provenance.