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App-ads.txt validator

Validate a pasted app-ads.txt with the same IAB seller-record checks, aimed at developer domains from store listings.

Paste an app-ads.txt body to validate it.

The IAB app-ads.txt file is the ads.txt format applied to apps. The check here is structural: exchange domain, publisher account ID, DIRECT or RESELLER, and the optional certification authority ID, plus duplicate detection. Passing does not prove any seller is actually authorized; only the ad exchanges can confirm that. One placement note matters more than any single record: the file must live at the developer or publisher domain your app store listing declares, not at the store's own domain, and this tool flags records that name a store host by mistake. This tool also cannot fetch a domain to see whether the file is deployed where the listing points; paste the file contents and compare them against the domain yourself.
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Canonical HTML: https://nutter.tools/web/app-ads-txt-checker
Markdown version: https://nutter.tools/web/app-ads-txt-checker.md
Plain-text version: https://nutter.tools/web/app-ads-txt-checker.txt
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