Ad Blocker Test

How to check if an ad blocker is working

Give the test a few seconds. A green blocked result means at least one ad-related signal was stopped; the row beneath it tells you what happened. Read that row before changing settings, especially when only the outside advertising request failed.

1. 1

   Wait for the automatic checks

   Keep this tab open for a few seconds. The result combines visible element filtering with local and third-party request tests.

2. 2

   Read each signal

   Blocked page elements usually point to a browser extension or built-in shield. A failed advertising request may also come from DNS or network filtering.

3. 3

   Check the simulated placements

   Four harmless test ads should be visible when cosmetic filtering is off. A blocker may hide one box or collapse the entire row.

4. 4

   Change one setting

   Pause or enable the blocker for this site, then press the circular retest button. Changing one control makes the comparison easier to trust.

Is my ad blocker on in this browser?

A hidden test placement points toward cosmetic filtering inside the browser. Extensions and built-in protections can apply those CSS rules. The test also asks for a harmless local file named like an ad resource, which catches another family of URL-based rules.

Browsers do not give ordinary pages a trustworthy list of installed extensions. So the tool reports observed behavior. It will not guess whether uBlock Origin, AdGuard, Ghostery, Brave Shields, a security suite, or another product caused it.

Adblock test site results explained

One tidy score can feel satisfying, but it hides useful differences. This adblocker tester keeps the evidence separate so a blocked tracker does not get mistaken for proof that display ads are gone.

Website with ads to test Adblock

The four placements inside the tool look like familiar banner, sidebar, sponsored, and display slots. They are local simulations. No ad auction runs, there is nothing to click, and the boxes do not plant tracking cookies.

Testing adblocker extensions, DNS filters, and browser shields

EasyList documents both network rules and cosmetic filters, which is why a useful ad blocker checker needs more than one invisible div. And privacy lists may cover analytics even when an ad request remains open.

Why ad blocker detection can be inconclusive

A timeout is weak evidence. Hotel Wi-Fi login pages, school or workplace firewalls, a brief outage, strict browser privacy settings, and DNS trouble can all stop the same request. I would repeat a lone network failure before changing anything (especially on a connection that has just woken from sleep).

• Confirm another site loads before trusting a blocked network row.
• Retest once. Cached rules and extension updates can settle after a reload.
• Try a second network when you suspect router-level or DNS blocking.
• Check private browsing separately because extension permission may differ there.

Test my adblocker after changing its settings

Open the blocker from the browser toolbar and inspect its control for this site. Remove a site allowlist entry or turn protection back on, then use the retest button. On a laptop with several profiles, verify the active profile first; the same extension icon can be present in one profile and absent in the next.

Adblock Plus can permit non-intrusive ads through its Acceptable Ads option. Other products use different names for allowlists, custom filters, annoyance lists, and strict modes. Change one setting at a time. Otherwise a better result tells you very little about which control fixed it.