Google Preferred Sources lets searchers choose the websites they want to see more of in Top Stories, AI Overviews, and AI Mode. Google reports that people click through to a site twice as often once they select it. Any regularly updated domain qualifies, including Thai business blogs, not only news publishers.
Google Preferred Sources went from roughly 90,000 selected sites in December 2025 to more than 600,000 in August 2026. Almost none of them are Thai businesses.
That gap is the opportunity. Preferred Sources is the first Google feature in years that lets a reader hand you a persistent ranking advantage, and it does not require backlinks, domain authority, or a bigger content budget. It requires that someone reads your site and decides they want more of it.
You will learn what the feature actually does, why the eligibility rules matter more than the marketing copy suggests, how to install the button in under an hour, and the honest limits of what it can do for a company in Bangkok selling condos, kindergarten places, or logistics software.
Start with the mechanics, because most agency explanations of this feature get them wrong.
What Google Preferred Sources Actually Does
Preferred Sources is a user setting, not a ranking algorithm you can optimise for.
A searcher opens Google, taps the star icon beside the Top Stories header or visits google.com/preferences/source, and ticks the sites they want prioritised. From that point, Google is more likely to surface those sites in that person’s Top Stories results, with a “preferred” badge attached. Since May 2026 the same preference list also feeds AI Mode and AI Overviews, which is the part most marketers have missed.
The timeline matters, because the feature has changed shape three times in twelve months. Google launched Preferred Sources in the US and India in August 2025 as a Top Stories test. On April 30, 2026, Google extended it to every language where Google Search operates, which brought Thai-language search into scope. In May 2026 the preference list expanded into AI Mode and AI Overviews. On August 20, 2026, Google shipped a button publishers can embed directly in their own pages, so a reader can add you in one click without leaving the article. Adoption tracks that curve: roughly 90,000 unique sources selected by December 2025, 345,000 by late May 2026, and more than 600,000 by August 2026.
Google’s own number for the payoff is a doubling: users click through to a site twice as often on average once they have marked it as preferred. That statistic has stayed consistent across every Google announcement since December 2025, which suggests it is a stable finding rather than launch-day optimism.
What this means for you: Preferred Sources is not an SEO tactic you execute once. It is a subscription mechanic bolted onto search results, and it rewards sites that give people a reason to come back.
Why Preferred Sources Matters More in Thailand
Thailand is one of the best markets in the world for this feature, and almost nobody here is using it.
Google holds close to 99% of search market share in Thailand, far above the global average. Thailand also has 67.8 million internet users at 94.7% penetration as of late 2025, on a mobile base of 96.6 million connections that are 100% broadband. We track the full picture in our Thailand digital marketing and SEO statistics roundup. When a single search engine controls that much of a highly connected market, a personalisation setting inside that engine carries unusual weight.
The competitive picture makes it better. Thai brands compete for Top Stories and AI Overview placement in Thailand against a shallow field. Very few Thai companies publish consistently, fewer still publish on a schedule Google would classify as regularly updated, and I have yet to see a Thai SME site with the Preferred Sources button installed.
There is one wrinkle worth knowing. When Google released official button assets, it shipped them in 16 languages: Danish, English, Estonian, Finnish, French, German, Hebrew, Hindi, Japanese, Korean, Portuguese, Russian, Spanish, Swedish, Turkish, and Ukrainian. Thai is not on that list. The feature works in Thai, but the ready-made button label does not exist yet, so Thai-language sites need a custom label or the deeplink method described below.
The implication is straightforward. You are early, and being early on a feature that compounds through repeat readers is worth more than being early on a feature that does not.
Inspira Insight
At Inspira, we tested the Preferred Sources button on a Bangkok property client’s blog in the weeks after Google’s August 2026 launch. The button placement mattered more than the button itself. Placed in the sidebar, it was ignored. Placed directly beneath the final paragraph of long-form guides, where readers had just finished something useful, it started collecting clicks. Here is what that taught us: nobody subscribes to a website. They subscribe to a specific piece of writing that helped them, at the moment it helped them.
Can a Non-News Site Become a Preferred Source?
Yes, and this is the single most misunderstood point about the feature.
Google’s documentation does not restrict Preferred Sources to news publishers. It restricts eligibility on two other axes. First, only domains and subdomains qualify. The site inspiradigitalagency.com is eligible and blog.inspiradigitalagency.com is eligible, but inspiradigitalagency.com/blog is not. If your content lives in a subdirectory, you cannot be selected as a preferred source for that section alone. The whole domain is the unit.
Second, your site must appear in Google’s source preferences tool at google.com/preferences/source. Google notes that sources which are not updated regularly may not be available there. That is the real gate. A Thai company that publishes four articles a year will likely not appear in the picker at all, which makes the button pointless. If cadence is your weak point, start with our guide to content marketing for Thai SMEs before you touch the code.
There is a related signal outside Top Stories. In its February 2026 Discover core update documentation, Google confirmed that source preferences play a role in which sites appear in Discover. Discover drives meaningful mobile traffic in Thailand, so the same setting pays out in two places.
Before you write a line of code, check whether your domain appears at google.com/preferences/source. If it does not, publishing frequency is your problem, not implementation.
How to Add the Google Preferred Sources Button
Google offers three implementation methods, and the simplest takes two lines of HTML.
The standard JavaScript method loads Google’s publisher library and drops in a button element:
<script async src="https://news.google.com/swg/js/v1/publisher.js"></script>
<div google-add-preferred-source-btn></div>You can add data-theme for light or dark styling and data-lang to override the button language. Because Thai is not among the 16 supported button languages, Thai-language sites should either set data-lang to English or use one of the other two methods with custom copy.
The advanced JavaScript method gives you programmatic control through an ES module import or a script callback queue, so you can trigger the flow from your own UI element. Use this when your design system will not tolerate a third-party button.
The deeplink method is the fallback for any CMS that cannot execute JavaScript. Link to https://www.google.com/preferences/source?q=yourdomain.com from text or an image. It is less elegant, since the user leaves your page, but it works everywhere including WordPress installs with locked-down theme files.
Pick the standard method unless something specific stops you. The engineering cost is close to zero, so the only real decision left is where the button goes.
How to Get Chosen: Earning the Click, Not Buying It
Installation is the easy half. Getting selected is the part that fails.
A Preferred Sources click is a subscription decision. The reader is telling Google to show them more of you, indefinitely, across Top Stories and AI Overviews. People do not make that commitment for a service page or a 600 word listicle assembled from other people’s articles. They make it after something on your site saved them time, money, or a mistake.
Three things move the number in practice. Publish on a predictable cadence, because irregular sites drop out of the picker. Place the ask at the point of maximum goodwill, meaning the end of your best content rather than a sidebar nobody reads. Say what the reader gets, not what you get, since “See more Bangkok property market updates in your Google results” outperforms “Add us as a preferred source” every time.
The Guardian, The Telegraph, and the Daily Mail all shipped the button within days of the August 2026 launch, and none of them used identical wording or placement. That is a signal worth reading, and Search Engine Journal reached the same conclusion when the feature went global. The publishers with the most to lose from AI traffic decline are treating placement and copy as a variable to test, not a setting to configure.
Preferred Sources sits inside a wider shift toward earned visibility in AI results, which is the whole basis of our AI search optimization work in Bangkok.
Treat this like an email list signup, because functionally that is what it is. The difference is that Google delivers the message instead of your ESP.
What You Can Measure and What You Cannot
Here is the uncomfortable part: Google gives you almost no reporting on this.
Search Console has no Preferred Sources report. There is no dashboard showing how many users have selected your domain, no breakdown by country, and no way to see how many impressions carried the preferred badge. Google publishes aggregate platform numbers and nothing at the account level.
You can still measure the parts you control. Track clicks on the button itself as a GA4 event, since that captures intent even though it does not confirm the selection completed. Watch returning-user organic sessions and branded search volume over a 90 day window, because a rising preferred-source base should lift both. Segment Discover traffic in Search Console separately, given that source preferences influence Discover placement. The same proxy logic applies across every AI surface, which we cover in how to measure AI search traffic.
Do not promise a client a Preferred Sources KPI. You cannot report on it directly, and any agency that claims otherwise is either guessing or inventing numbers.
Set expectations before you install, not after the first monthly report.
Frequently Asked Questions
Yes. Google extended Preferred Sources to every language where Google Search operates on April 30, 2026, which includes Thai. Thai users can select preferred sources through the star icon beside Top Stories or at google.com/preferences/source. One caveat: Google’s official button assets ship in 16 languages and Thai is not among them, so Thai-language sites need custom button copy or the deeplink implementation.
No. Preferred Sources raises the likelihood that your content appears for users who selected you, but it does not override relevance. Google still requires fresh content that matches what the person searched for. If you publish nothing relevant to a query, being preferred changes nothing. Think of it as a tiebreaker among qualified results, not a bypass around ranking.
Yes. Google’s eligibility rules are about site structure and publishing frequency, not content category. Any domain or subdomain qualifies if it appears in Google’s source preferences tool. Sites that are not updated regularly may not appear there at all. Subdirectories such as example.com/blog are never eligible on their own, so the domain is what gets selected.
Add two lines to your theme’s template or a custom HTML block: the Google publisher script tag and a div carrying the google-add-preferred-source-btn attribute. If your setup blocks third-party JavaScript, link to https://www.google.com/preferences/source?q=yourdomain.com instead. Both methods work on WordPress. The deeplink sends users off-site, so prefer the script version where possible.
Yes. Since May 2026, the same source preference list feeds AI Mode and AI Overviews, not just Top Stories. Google’s February 2026 Discover core update documentation also confirmed that source preferences influence which sites appear in Discover. One user action now affects your visibility across four Google surfaces, which is why the feature deserves more attention than it currently gets in Thailand.
Conclusion
Google Preferred Sources rewards the thing most Thai businesses have avoided for a decade: publishing consistently enough that someone would choose to hear from you again.
You now know that the feature is not restricted to news sites, that eligibility hinges on domain-level structure and publishing cadence rather than authority metrics, and that a reader’s single click follows you into Top Stories, Discover, AI Mode, and AI Overviews. You also know Google will not report on it, so you measure by proxy or not at all.
The install takes an hour. The reason for someone to click takes longer, and that is the actual work.
If you want a straight assessment of whether your site would even appear in Google’s source picker today, request a free SEO audit from Inspira Digital Agency and we will check it with you.
Xavier Cloitre
Founder and Marketing Director, Inspira Digital Agency
Bangkok, Thailand
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