ads.txt Validator
Checks each line of ads.txt has the required domain, account id and relationship fields.
What this tool checks
ads.txt is valid
When an ads.txt file is present, checks each line has the required domain, account id and DIRECT/RESELLER relationship fields.
Why it matters: A malformed ads.txt can cause ad exchanges to reject inventory as unauthorised, directly affecting ad revenue. Sites that don’t sell ads don’t need one.
If it fails: Fix the flagged lines — each should read "domain, account-id, DIRECT|RESELLER".
Source: iabtechlab.com/ads-txt/
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