Can You Detect AdBlock
Can websites detect ad blocking?
Checking…
Simulates what a normal website can learn from your browser — not a stealth audit.
How to use
- Open the page with your ad blocker enabled — read Yes if bait was hidden.
- Disable the extension or allowlist this site, Refresh, and compare No.
- Try multiple blockers (uBlock, AdGuard, Brave shields) in separate profiles.
FAQ
Can websites detect uBlock Origin?
Often yes. Many sites inject elements with class names targeted by popular filter lists (adsbox, adsbygoogle, etc.). If CSS hides or collapses the bait node, scripts infer an ad blocker — this page uses the same idea.
Why No when I have an ad blocker?
Some blockers do not hide bait elements, use cosmetic filters only on real ad domains, or you allowlisted this site. No here means this specific test did not trip — not proof that no site can detect you.
Same as Am I Blocking Ads?
Same bait technique; [am I blocking ads](/tools/am-i-blocking-ads) frames it as your setting. This page frames it as what **publishers can detect**.
Is adblock detection ethical?
Publishers use it to protect revenue or ask users to allowlist. Users use blockers for speed and privacy. This tool is neutral — it shows detectability, not who is right.
Can sites detect Brave or Safari tracking prevention?
Brave Shields and similar features may block trackers without matching classic ad-bait patterns. Results vary by browser and list.
Is anything uploaded?
The test creates a hidden DOM node locally and inspects its layout. No ad history is sent to us.
Introduction
Can You Detect AdBlock runs a bait element test — the same family of technique news sites and publishers use before showing “please disable your ad blocker” banners. If filter lists hide the decoy ad slot, the headline reads Yes: sites can likely detect blocking.
Ad blocking is widespread; so is anti-adblock. Understanding detectability helps users choose allowlists and helps developers test messaging without guessing.
How detection works
| Step | What happens |
|---|---|
| Inject bait | Hidden div with classes filter lists target |
| Wait one frame | Let extensions apply cosmetic rules |
| Measure layout | zero height, display:none, or no box → blocked |
| Report | Yes/No headline for this technique |
Advanced publishers stack multiple baits, script integrity checks, and ad-script load tests. This page implements the common DOM bait pattern only.
Yes vs No
- Yes — bait was hidden or collapsed; classic ad-block signature detected.
- No — bait rendered normally; this test did not detect common list behavior.
Yes does not name your extension. No does not guarantee invisibility on every site.
Common use cases
- Before visiting a paywalled news site — know if you will trigger an anti-adblock wall.
- Publisher QA — verify your anti-adblock script fires when uBlock is on.
- Compare browsers — Safari vs Chrome with different shield settings.
- Support — confirm a user’s blocker affects on-page elements.
Best practices
- Toggle blocker off and on with Refresh to see both states.
- Allowlisting a trusted site often fixes broken layouts without disabling global blocking.
- Pair with am I blocking ads for the user-centric wording of the same check.
- Adblock detection is unrelated to can you detect VPN — but some sites combine both signals in analytics.