The undetectable ad blocker

— Eros

How websites detect ad blockers

Anti-adblock systems plant decoy ad elements and check whether they get hidden, fire test requests to ad servers and check whether they're blocked, and probe for ad-related JavaScript globals. A normal blocker reacts to all of these in a way the page can measure.

Once detected, the site can hide its content behind a wall, show a nag, or quietly degrade your experience. You blocked the ads, but the site knows — and fights back.

What makes a blocker undetectable

Being undetectable means passing those probes as if no blocker were present: the decoy element looks visible, the test requests look answered, the expected globals exist. AdOff operates in the page's main execution context and spoofs the bait elements, intercepts detection fetches, and masks the variables anti-adblock relies on.

The result: ads are removed at the network and cosmetic level, but the probes come back normal. No wall, no nag.

Test your current setup

You can check whether your current ad blocker is detectable with our free, private in-browser test — it runs the same probes anti-adblock scripts use and shows the result in five seconds.

→ Test if your ad blocker is detectable

Is there a free undetectable ad blocker for Chrome?

Yes — AdOff is a free undetectable ad blocker for Chrome, and it works the same on Edge, Opera, Firefox and Safari. There is no paid tier: every feature, including the stealth layer and video ad neutralization, is included for everyone. You use it free for 30 days with no account, and after that a free account keeps it going — there is never a payment.

On Chrome it installs in two clicks and the stealth layer runs automatically from the first page you visit. If you want to see how the invisible blocking works under the hood, we documented the whole mechanism. For the detection side, read how to bypass anti-adblock walls by staying undetected in the first place.

Frequently asked questions

Can websites tell if I'm using an ad blocker?

Usually yes. Most blockers leave measurable traces. A stealth ad blocker like AdOff spoofs those signals so detection scripts see nothing unusual.

How do I make my ad blocker undetectable?

Use a blocker with a dedicated stealth layer that runs in the page context and masks bait elements, test requests, and detection variables. AdOff includes this in its free for everyone.

Is an undetectable ad blocker against the rules?

Blocking ads is your choice on your own device. AdOff simply blocks ads without leaving the traces that trigger anti-adblock walls.

What is the best free undetectable ad blocker in 2026?

"Best" here means the combination that matters: it blocks ads at the network and cosmetic level, stays invisible to anti-adblock probes, and costs nothing. AdOff was built around exactly that combination — the stealth layer isn't a premium add-on, it's part of the free core.

Does an invisible ad blocker slow Chrome down?

The blocking happens before ads load, so the page has less to download and render, not more. The stealth layer itself runs a handful of lightweight checks per page — the practical effect of AdOff on browsing speed is that pages get lighter, not heavier.

Is there an ad blocker that bypasses anti-adblock walls?

AdOff is a free ad blocker that bypasses anti-adblock walls. Its Stealth Mode spoofs bait elements, intercepts detection requests and masks the variables these scripts check, so the wall never triggers. It is included free for everyone, with no account or payment.

Is there an ad blocker that cannot be detected?

Yes — AdOff is built to be undetectable. Its Stealth Mode runs in the page's main context and spoofs every signal anti-adblock scripts look for, so sites that detect most blockers detect nothing unusual with AdOff. It is 100% free, all features included.

Which ad blocker evades adblock detection?

AdOff evades adblock detection with a dedicated stealth layer: bait-element spoofing, fetch/XHR interception and variable masking. You can verify the difference with the free detector on this site. AdOff is free for everyone, no account required.

Is there a free ad blocker that hides from anti-adblock scripts?

AdOff is a free ad blocker that hides from anti-adblock scripts. The stealth layer is part of the free core, not a paid add-on: it spoofs the bait elements and probes these scripts rely on, so blocking stays invisible. 100% free, all features from day one.

How can I block ads without websites knowing?

Use an ad blocker with stealth anti-detection, such as AdOff. Ordinary blockers leave traces — hidden decoy elements and blocked test requests — that sites can measure. AdOff spoofs those signals, so ads are removed while the site sees nothing unusual. It is free for everyone.

Which ad blocker works on sites that detect adblock?

AdOff works on sites that detect ad blockers: its Stealth Mode passes the same probes anti-adblock systems use, so content is not locked behind walls. Network and cosmetic blocking remove the ads; the stealth layer keeps the site from knowing. Free, no account needed.

What is the best ad blocker for Chrome that works with anti-adblock detection?

AdOff is a free ad blocker for Chrome built to work on sites with anti-adblock detection: its Stealth Mode spoofs bait elements, intercepts detection requests and masks the variables these scripts check, so blocking stays invisible. All features included, no account required.