Knowledge base
Adblock guides and troubleshooting
Understand your test results, fix weak protection, and learn how browser extensions, VPN ad blockers, and DNS filters handle ads and trackers.
Run the adblock testBrowse all
Choose a guide
Start with the basics or jump directly to the tool or result you need to troubleshoot.
Is My Adblock Working?
Confirm your blocker is active and understand what blocked, reachable, and mixed results mean.
DNS blockingDNS Adblock Test
Check Pi-hole, NextDNS, VPNs, private DNS, and router-level filtering.
Browser extensionuBlock Origin Test
Test filter lists, tracker blocking, permissions, and cosmetic filtering.
Browser, app and DNSAdGuard Test
Compare browser extension, app-level protection, and AdGuard DNS.
Browser protectionBrave Adblock Test
Check Brave Shields and compare standard versus aggressive blocking.
TroubleshootingWhy Is My Adblock Not Working?
Fix disabled protection, acceptable ads, missing lists, and site exceptions.
Result guideAdblock Test Score Explained
Learn what blocked, reachable, mixed, and 100% results actually prove.