Infolinks

What Is Infolinks?

Infolinks is an in-text and in-content advertising network that lets publishers monetize their pages without giving up large blocks of visual real estate to traditional banner ads. Instead of reserving a rectangle for an ad, Infolinks turns elements that already exist on the page, certain keywords in the body text, the area around the content, and small overlay units, into advertising surfaces. Its signature format underlines or highlights specific words in an article; when a reader hovers over or clicks one, a small ad bubble appears.

Founded in 2007, Infolinks positioned itself as an alternative or complement to display networks like Google AdSense, appealing to publishers who wanted an additional revenue stream that did not require carving out dedicated ad slots in their layout. Over the years it broadened its ad formats beyond pure in-text links to include in-fold, in-tag, in-frame, and in-screen units, but it remains best known for the in-text advertising model that made it recognizable. Infolinks is a self-service network with a low barrier to entry, which historically made it popular with smaller and mid-size content sites.

It is important to classify Infolinks accurately. It is an advertising network on the publisher-monetization side: its customer is the website owner looking to earn money from traffic, and on the buy side it connects to advertiser demand. It is not a browser extension, a CMS, or an analytics tool, and it is not a managed, application-gated premium service like AdThrive or Mediavine. Infolinks is closer in spirit to a self-service program you join and add to your site yourself, trading the higher revenue of curated premium networks for accessibility and ease of setup.

In detection terms, finding Infolinks on a site usually indicates an independent content publisher, often a smaller one, looking to supplement revenue with a lightweight, layout-friendly ad format. It is a signal about both the site's business model and, frequently, its scale.

How Infolinks Works

Infolinks operates by injecting a small JavaScript tag into the publisher's pages. Once loaded, the script scans the page content and identifies opportunities to place its various ad formats. For the classic in-text format, the script parses the body text, matches certain keywords against available advertiser demand, and wraps those words in a styled, clickable link (often a double underline). When a reader interacts with the highlighted word, a small ad unit, an "ad bubble", expands to show a relevant advertisement.

Beyond in-text, Infolinks supports several other formats that the same tag can render. In-fold units appear near the bottom or edges of the viewport. In-tag displays a cloud of related keyword tags that lead to ads. In-frame places ad units in the unused margins alongside the content on wide screens. In-screen can show an interstitial-style overlay. The publisher configures which formats are active, and Infolinks' system decides what to render based on the page, the available demand, and performance.

The monetization itself is programmatic. Infolinks connects publisher inventory to advertiser demand and fills the units with ads, paying the publisher based on clicks and impressions depending on the format. Because the formats are designed to use space the page is not otherwise monetizing, in-text words, margins, overlays, Infolinks is often layered on top of, rather than instead of, a display network, allowing publishers to stack revenue sources.

A useful way to picture the workflow is to follow a page load. A reader opens an article on a hobby or how-to site. The Infolinks script initializes, scans the article text, and underlines a handful of relevant keywords while also preparing any configured in-fold or in-frame units. As the reader scrolls and reads, they encounter the highlighted terms; hovering over one pops a small contextual ad. If the reader clicks, the publisher earns revenue. None of this required the publisher to set aside a banner slot, the ads emerged from the existing content and layout, which is precisely the appeal of the in-text model.

Because the in-text format depends on parsing and modifying the page's text client-side, Infolinks' behavior is fundamentally driven by JavaScript executing in the browser. This matters for detection: the underlined keywords and ad bubbles are generated at runtime rather than present in the original HTML, so a rendering-aware analysis sees the full picture while a raw HTML fetch primarily sees the loader script.

How to Tell if a Website Uses Infolinks

Infolinks leaves recognizable fingerprints in a page's HTML and, especially, its network activity. StackOptic checks these from the server side, and you can verify the same signals manually with browser tools or curl. Because much of Infolinks' rendering happens client-side, watching the page execute reveals more than the static source alone.

The Infolinks script domains. The strongest signal is a request to Infolinks' own asset domains, historically resources.infolinks.com and related infolinks.com hostnames that serve the loader and ad scripts. Seeing a request to an infolinks.com endpoint is a near-definitive tell.

The loader snippet and account IDs. Publishers install an Infolinks JavaScript snippet that typically defines variables such as infolinks_pid (the publisher ID) and infolinks_wsid (a website/section ID). Finding infolinks_pid in the page source is a dependable indicator that the site runs Infolinks.

In-text link markup. When the in-text format renders, the script wraps keywords in anchor elements with Infolinks-specific styling and class or attribute hooks (double-underlined links that trigger an ad bubble). Inspecting those highlighted words in DevTools reveals markup tied to Infolinks rather than ordinary editorial links.

Ad-bubble and overlay containers. The expandable ad bubble and any in-frame or in-screen units are injected as containers in the DOM, visible when you inspect the page after the script has run.

Network calls for ad fills. As the units request ads, the Network tab shows calls back to Infolinks' ad-serving endpoints, corroborating the loader-script signal.

Method	What to do	What Infolinks reveals
View Source	"View Page Source"	The Infolinks loader snippet with infolinks_pid / infolinks_wsid
Browser DevTools (Network)	Open the Network tab and reload	Requests to resources.infolinks.com and other infolinks.com endpoints
Browser DevTools (Elements)	Inspect underlined keywords in an article	Anchor markup and ad-bubble containers tied to Infolinks
Wappalyzer	Run the extension on the live page	Often identifies "Infolinks" under advertising
BuiltWith	Look up the domain	Current and historical Infolinks usage

A quick command-line check is curl -s https://example.com | grep -i infolinks. If the loader snippet is hard-coded, this returns matches such as infolinks_pid; the in-text links and ad bubbles themselves, however, only appear once the script runs, so a rendered view or a look at the live Network tab gives the complete answer. For the broader methodology, see our guides on how to find out what technology a website uses and, since ad networks are frequently deployed through a tag manager, how to check if a website uses Google Tag Manager.

It is worth understanding how these signals behave in practice. Publishers rarely hide Infolinks, since the script must run to generate revenue, and the loader snippet with its publisher ID is usually present in the source. The main subtlety is the client-side nature of the in-text format: because the underlined keywords are created at runtime, a tool that only reads raw HTML will see the loader but not the rendered ad links, which is why server-side analysis that can render or inspect injected elements is more dependable. Combining the infolinks.com network requests, the infolinks_pid snippet, and the in-text markup produces a confident verdict.

Key Features

• In-text advertising. Monetizes keywords within the body content by turning them into clickable, ad-revealing links.
• Multiple ad formats. In-text, in-fold, in-tag, in-frame, and in-screen units that use space a layout is not otherwise monetizing.
• Layout-friendly. Designed to add revenue without requiring dedicated banner slots, so it can layer on top of existing ad setups.
• Self-service and low barrier. Easy sign-up and installation, historically open to smaller and mid-size publishers.
• Programmatic demand. Connects publisher inventory to advertiser demand and fills units automatically.
• Configurable formats. Publishers choose which ad types are active to balance revenue against user experience.

Pros and Cons

Pros

• Adds a revenue stream without sacrificing layout space to banner ads.
• Low barrier to entry, accessible to smaller sites that premium networks would reject.
• Can be stacked alongside a display network to increase total earnings.
• Simple, self-service setup with minimal technical effort.

Cons

• In-text and overlay formats can feel intrusive and may degrade the reading experience if overused.
• Typically lower revenue per impression than premium managed networks for high-value traffic.
• Effectiveness depends on content type; text-heavy pages monetize better than sparse ones.
• Some readers and ad blockers treat in-text ads unfavorably, which can limit yield.

Infolinks vs Alternatives

Infolinks competes with display networks and other supplementary monetization options. The table below clarifies its niche.

Network	Ad model	Entry barrier	Best for
Infolinks	In-text and in-content units	Low, self-service	Smaller content sites wanting layout-friendly extra revenue
Google AdSense	Display and in-feed ads	Very low, self-service	Broad monetization for most publishers
Media.net	Contextual display ads	Moderate	Sites wanting a contextual alternative or complement to AdSense
AdThrive (Raptive)	Full-service managed ad management	High pageview minimum	Large, established content publishers
Mediavine	Full-service managed ad management	Moderate pageview minimum	Growing publishers seeking premium management

For the most common display network that Infolinks frequently complements rather than replaces, see Google AdSense. Publishers often run both, with AdSense handling standard display slots and Infolinks monetizing in-text and marginal space.

Use Cases

Infolinks is most at home on independent, text-rich content sites that want to supplement their advertising revenue without redesigning their layout around banner slots. Blogs, niche information sites, how-to and tutorial properties, and forums are common adopters, places where long-form text gives the in-text format plenty of keywords to work with. It is particularly attractive to publishers who do not meet the traffic thresholds of premium managed networks but still want to earn more than a single display program provides.

It also fits sites that already run a display network and want an additional, non-competing revenue layer, as well as smaller international publishers for whom Infolinks' low barrier to entry is a practical advantage. For competitive and market research, detecting Infolinks typically signals an independent content publisher, often a smaller or mid-size one, that is actively monetizing traffic and willing to use multiple ad formats to maximize revenue.

Consider a few concrete scenarios. A hobbyist blogger writing detailed guides might add Infolinks alongside AdSense to squeeze additional revenue from the keyword-rich articles without adding more banner units. A niche forum with heavy text content might use the in-text format to monetize discussions that would not lend themselves to large display ads. A mid-size how-to site that has not reached the pageview minimum for a premium managed network might rely on Infolinks as part of a stacked monetization strategy while it grows.

From a sales-intelligence perspective, Infolinks detection is a useful qualifier. For vendors selling tools or services to independent publishers, finding Infolinks flags a monetization-focused content site, frequently one operating below the scale of premium-network publishers. For analysts mapping a content niche, it helps distinguish smaller, revenue-stacking publishers from larger properties on managed services, the kind of distinction a technology-detection scan surfaces in seconds across many domains. To understand how such signals feed qualification, see what is technographics: using tech-stack data to qualify leads, and to separate ad tags from measurement tags during an audit, see how to find out what analytics a website uses.

Frequently Asked Questions

What is in-text advertising?

In-text advertising monetizes the words already on a page rather than dedicated banner slots. A script scans the body content, matches certain keywords to advertiser demand, and turns those words into clickable links, often shown with a double underline. When a reader hovers over or clicks a highlighted word, a small ad unit appears. Infolinks popularized this model as a way for publishers to earn revenue without surrendering visual space in their layout to traditional display ads.

How can I tell if a website uses Infolinks for free?

Yes, you can confirm it at no cost. View the page source and search for the Infolinks loader snippet, especially infolinks_pid and infolinks_wsid, or open DevTools and watch the Network tab for requests to resources.infolinks.com and other infolinks.com endpoints. Inspecting double-underlined keywords in an article also reveals Infolinks markup. Free tools like Wappalyzer and BuiltWith report Infolinks too, and curl -s URL | grep -i infolinks works from any terminal, though the in-text links themselves only render once the script runs.

Is Infolinks better than Google AdSense?

They are different rather than strictly better or worse. AdSense delivers standard display and in-feed ads and is the default for most publishers, while Infolinks specializes in in-text and in-content formats that monetize space a layout is not otherwise using. Premium traffic generally earns more from a full display setup, but many publishers run both, letting AdSense handle banner slots and Infolinks capture in-text and marginal inventory to increase total revenue.

Does Infolinks slow down or clutter a website?

Infolinks adds a JavaScript tag and renders its ad formats client-side, so like any ad script it adds some weight and processing to the page. The in-text and overlay formats can also feel intrusive if a publisher enables too many of them, which is why format choice matters for user experience. Publishers balance revenue against readability by selecting which units to run. If you are studying performance impact, our guide on how to make your website load faster explains how ad scripts interact with page-speed metrics.

What kind of sites typically use Infolinks?

Infolinks is most common on independent, text-rich content sites, blogs, niche information sites, how-to and tutorial properties, and forums, especially those that want extra revenue without meeting the high traffic thresholds of premium managed networks. Because its signature format monetizes keywords in body text, content-heavy pages benefit most. Detecting Infolinks therefore usually points to a smaller or mid-size publisher actively stacking ad formats to maximize earnings.

Want to detect Infolinks and the rest of a site's technology stack instantly? Run any URL through StackOptic at https://stackoptic.com.