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Blocks an AI crawler 12%Blocks GPTBot 11%ads.txt 22%Cookie consent banner 20%Ad pixels 23%llms.txt 15%HTTPS homepage 99%DMARC record 65%Blocks an AI crawler 12%Blocks GPTBot 11%ads.txt 22%Cookie consent banner 20%Ad pixels 23%llms.txt 15%HTTPS homepage 99%DMARC record 65%
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Runs in your browserSEO & publishing

ads.txt validator

Paste the file content; every problem is listed with its line number.

Runs locally — nothing is uploaded
Result
Nothing yet — enter data or press Example.

How to use

  1. 1Open yoursite/ads.txt and paste its content.
  2. 2Fix every error first, then the warnings.
  3. 3Upload the corrected file to the site root.

The ad system domain, your seller account ID, the relationship (DIRECT or RESELLER) and optionally the certification authority ID.

Buyers skip lines they cannot parse, so that inventory may look unauthorised.

Got a story or an ad stack to fix?

Write to the desk — we reply within one business day.