How Ad Blockers Work — and What Publishers Can Do About Them

Ad blockers have made publishers genuinely nervous — and rightly so. Reports from Adobe and PageFair have documented the global growth of ad blocking software and the measurable financial toll it takes on online advertising revenues.

The fear that ad blocking will severely hamper the industry is not unfounded. But there are concrete steps publishers (and advertisers) can take to counter the trend. Understanding the mechanics of ad blocking is the necessary starting point.

How Ad Blockers Work

Ad blockers use several different techniques to detect and prevent ads from being shown. Examining those techniques also reveals where the digital advertising system is most exposed — and where improvements are possible.

The fragmentation of the digital advertising landscape is a central part of the problem.

A typical ad impression involves a whole chain of platforms communicating back and forth: data management platforms, demand-side platforms, ad exchanges, supply-side platforms, ad networks, and ad servers. Every time a creative is served, those platforms must pass control between themselves in sequence:

• Browser sends an ad request to the ad server
• The ad server redirects the browser to the SSP, which sends a bid request to bidders
• The SSP returns an ad markup that loads the creative from the winning DSP's ad server
• The browser loads the creative from the CDN

All of this communication is marked with specific ad tags so each platform knows how to hand off to the next.

Ad blockers exploit exactly that. Whenever one detects a domain on its block list, it intervenes. It can also intercept communication that contains terms like "adsense" or "ad" — anything matching its definition of an ad-serving component.

A second technique works differently: rather than blocking the request, the ad blocker hides the creative after it has already loaded. This typically targets HTML elements whose class or ID attributes signal advertising purposes — for example, class/id="ad".

What Publishers Can Do

Despite the anxiety around ad blocker adoption, publishers have several practical options. Since most ad blocking software targets the communication chain between the browser and ad-serving platforms (SSPs, ad servers, ad networks), media served through those pipelines is also the most likely to feel intrusive or disruptive to user experience — theoretically, any advertiser can end up on any publisher's page.

With that context in mind, the more effective publisher responses tend to start from the user's perspective.

Go Native or Go Direct

The rise of ad blockers can serve as a forcing function for publishers to become more audience-focused.

At the simplest level, that means direct communication with readers: since most ad blockers include a "whitelist" option, publishers can simply ask their audience to whitelist the site. Done transparently and respectfully, this approach has real merit.

More structurally, it could mean rebuilding direct relationships between publishers and advertisers — with creatives more aligned with surrounding page content. Programmatic direct deals reduce the number of intermediaries in the serving chain, which in turn makes ads less likely to be caught by blockers.

Native advertising takes this further. Native ads are inherently less intrusive and are typically positioned in ways that don't conflict with a reader's experience on the page. More importantly, they are more likely to deliver genuine value to the reader — giving site visitors a reason to want to see the content rather than block it.

The Hard Paywall Approach

Publishers with sufficiently large and loyal audiences have the option of taking a harder stance: deny content access entirely to users running ad blockers until those blockers are disabled.

Large publishers including GQ, Axel Springer, and Forbes have taken exactly this approach. Evidence suggests it can work — surveys of ad blocker users indicate that a majority would be willing to disable their blocker if it were the only way to access content they wanted.

That said, this strategy has real limits. For smaller publishers, a blanket block will simply drive readers to competitors. And even for large publishers, the long-term sustainability of the approach depends on whether content is compelling enough to justify the friction.

The underlying lesson is instructive regardless: if a publisher's content is engaging and genuinely desirable, there is leverage to negotiate on ad acceptance.

In-App Advertising

Most ad blocking occurs in the browser — desktop or mobile. As mobile usage has grown, one logical response for publishers is to focus revenue generation where ad blockers currently cannot reach: native mobile apps.

In-app advertising has several advantages beyond its current immunity to blocking software:

• It is less susceptible to the loading issues that affect browser-based pages
• Apps inherently attract more targeted user audiences
• App users generally have a clearer understanding of the trade-off between a free application and advertising support

The significant downside is cost. Developing a native mobile app requires meaningful upfront investment plus ongoing maintenance — which makes this a realistic option only for larger publishers.

Negotiated Access and Reward-Based Models

Publishers also have the option of meeting ad blocker users partway — offering something in exchange for a concession.

The Interactive Advertising Bureau (IAB) recommends several strategies for working with ad blocker users, including two approaches worth highlighting:

• Tiered content access — publishers grant limited access to users running ad blockers, while communicating that full access requires whitelisting or disabling the blocker
• Reward-based engagement — offering credits, bonus content, or other gamification elements in exchange for whitelisting, building positive relationships and trust over time

In all cases, the IAB emphasizes that communication between publishers and users is the key variable.

Forbes is a useful illustration. Rather than a blanket block, the publisher built a specific user experience that presents ad blocker users with a choice before they reach content: disable the blocker and receive an "ad-light" version of the site, or receive no access at all.

The approach works in part because of how it's framed — Forbes communicates directly with its readers, offers a genuinely lighter ad experience as a trade, and builds goodwill in the process rather than simply confronting users with a wall.

Emerging Models: User-Funded Content

Beyond the approaches above, some newer ideas have emerged that reframe the problem entirely.

Ad Block Plus partnered with a service called Flattr to create Flattr Plus — a model where users who want to support publishers while avoiding ads pay a predetermined monthly amount, which is then distributed algorithmically to the publishers they visit most frequently.

It's a voluntary micropayment model that sidesteps the adversarial dynamic altogether. Whether it scales broadly remains an open question, but it points toward a broader truth: the publishers most likely to navigate ad blocking successfully are those who invest in understanding their users and earning their trust — not just finding new ways to circumvent blocking software.

With the volume of revenue at stake from widespread ad blocking, the search for workable solutions is clearly worth the effort.