Free tool
Paste your AdMob publisher ID and get the exact line AdMob needs, formatted correctly, plus a checklist for hosting it where AdMob actually expects to find it.
Find this in AdMob Console under Apps → app-ads.txt, or in your account settings — it's the same ID used in your ad unit code.
1. Host at your domain root
Must be reachable at https://yourdomain.com/app-ads.txt — not in a subfolder.
2. Match your registered developer domain
The domain you used when registering in AdMob, exactly.
3. Give it 24–48 hours
AdMob crawls and validates the file on that schedule, not instantly.
Want the full picture on AdMob policies? Read the guide