Google is testing a new family of sitelink layouts for text ads on mobile, experimenting with darker vertical links, a left-side visual margin and, in another observed variation, images beside individual sitelinks. The formats were spotted on September 27 and documented the following day by search-industry observers. They remain experiments rather than a Google-announced redesign.
The most interesting part of the test is not the color of the links. It is the amount and structure of screen space an ad can occupy on a phone. When sitelinks move from a compact horizontal treatment into a vertically stacked list—and especially when imagery is added—the sponsored result becomes a much larger navigational object. That can create more opportunities for interaction while simultaneously pushing whatever follows it farther down the page.
The September test uses darker links and a vertical stack
Brodie Clark documented the September 27 experiment as a new mobile sitelink display for text ads in which all sitelinks use darker text and sit beside a margin on the left. His tracking notes add that each sitelink includes an arrow and that Google is testing related variations, including blue links and another treatment with images beside the sitelinks.
Search Engine Roundtable independently summarized the test as sitelinks listed line by line with a line or margin running down the left side of the mobile result. It also documented a variation without the line and a version using images.
Search Engine Watch likewise reproduced two examples of the new mobile treatment and emphasized that Google regularly experiments with different sitelink designs, making it too early to know whether any of the observed variants will become the default.
This is a SERP experiment, not a new advertiser control
Nothing in the current evidence indicates that advertisers have received a new setting that lets them choose this exact visual layout. Google’s official documentation says sitelinks can appear in different ways depending on device, position and other factors, while Google determines which eligible assets render with the ad.
That distinction matters for campaign teams. The correct response is not to search the Google Ads interface for a “dark vertical sitelinks” switch. The useful work is to make the underlying sitelink assets strong enough to perform across whichever treatments Google chooses to test.
The experiment departs from the familiar compact mobile model
Google’s current help documentation describes several possible mobile sitelink presentations. Mobile ads can show up to eight sitelinks, commonly in a single-line carousel that users swipe horizontally. Ads in the top position can also be eligible for a prominent treatment with one sitelink on each line.
The September screenshots therefore do not introduce vertical mobile sitelinks as an entirely new concept. What is new is the visual treatment being tested around that structure: darker text, arrows, the left-side margin and image-enhanced variants.
This is an important qualification because the test is best understood as Google iterating on presentation rather than inventing the sitelink asset itself.
A vertical format can materially increase ad footprint
On a mobile screen, every additional line has a spatial cost. A compact carousel can place several destinations within roughly one horizontal band. A stacked layout allocates a separate row to each visible destination. Add descriptions or images and the sponsored unit can become substantially taller.
That does not automatically mean Google will always show more sitelinks or that every tested ad is taller than every existing format. Rendering depends on the eligible assets and the treatment Google selects. But the observed designs demonstrate a route through which a single text ad can consume more vertical SERP real estate.
For organic search teams, that is the key visibility implication. An organic result can keep exactly the same numerical ranking while moving farther below the initial viewport because the paid result above it has expanded.
CTR effects cannot be inferred from the screenshots
The new formats could plausibly change click-through behavior, but there is no published performance dataset for this September experiment. Google has not disclosed CTR, conversion or engagement results for the darker-link, margin or image variants. Any claim that the new layout definitively increases CTR would therefore go beyond the evidence.
There is historical reason to take sitelink presentation seriously. In 2017, when Google introduced larger vertical mobile sitelinks alongside horizontal buttons, it reported internal results showing users were twice as likely to interact with sitelinks in the new format. That finding belongs to a different design, product era and user population, so it should not be treated as a performance forecast for the 2026 test.
More recent Google Ads documentation says advertisers who increased the number of sitelinks per campaign to six saw up to 3.5% more conversions on average at a similar cost per conversion in Google internal data from May 2025. Google separately reports that improving Responsive Search Ad and sitelink Ad Strength from Poor to Excellent was associated with 15% more conversions on average in an August 2025 internal dataset. Those figures support the general value of well-developed sitelink assets, not the specific new visual design.
Images could change the attention hierarchy inside the ad
The image variant is potentially the most consequential visually. Text sitelinks compete primarily through wording and position. A thumbnail introduces color, object recognition and visual salience before the user has read the destination label.
If that treatment expands, advertisers will need to think about whether their landing pages and available visual assets communicate clearly at very small sizes. An image that works as a large product photograph may become meaningless as a tiny sitelink thumbnail.
At the same time, the current screenshots do not establish how Google selects those images, whether the treatment will be broadly available, or whether advertisers will receive dedicated controls. Those questions remain open.
The left-side margin may make the sitelinks read as a distinct module
The vertical line or margin is subtle, but it changes how the eye groups the ad. Instead of reading the sitelinks as loose links beneath ad copy, the user can perceive them as a structured sub-navigation module attached to the sponsored result.
The arrows reinforce that interpretation by making each row look explicitly actionable. The combination resembles a menu more than a conventional block of text links.
That could improve scanning on small screens, but again, usability and CTR effects need behavioral data rather than visual intuition.
Advertisers can prepare without optimizing for a temporary skin
Google recommends creating at least four relevant sitelinks at account level and using unique, concise link text. Its documentation also recommends adding descriptions because those descriptions make ads more useful and can unlock additional formats.
Those fundamentals are more durable than chasing one experimental rendering. Advertisers should make sure each sitelink represents a genuinely different user intent, points to the most specific useful landing page and remains understandable without relying on the main ad headline for context.
Campaign teams should also inspect individual sitelink performance rather than looking only at aggregate ad clicks. Google Ads allows reporting to distinguish clicks on a specific sitelink from clicks on other parts of the ad.
Organic teams should measure pixels, not only rankings
The test also reinforces a broader problem in modern SERP measurement. Ranking position alone does not describe actual visibility when paid modules, AI features, shopping units and other rich elements can change height from query to query.
A useful mobile SERP monitor should record the pixel position of the first organic result, the height of the paid block above it, the number and type of sitelinks shown and whether images are present. Comparing those measurements over time can reveal whether organic exposure is changing even when rank tracking reports stable positions.
This is especially important for high-commercial-intent queries, where expanded paid formats are most likely to compete directly with organic listings for the initial mobile viewport.
A proper test needs to separate format from query intent
If advertisers gain enough exposure to the experimental layout to analyze it, comparisons should avoid mixing fundamentally different queries. Brand searches, category searches and high-intent transactional queries naturally have different click behavior.
The useful comparison is the same or closely matched query set across different sitelink renderings, controlling where possible for ad position, device, audience, creative and landing-page mix. Metrics should include sitelink CTR, overall ad CTR, conversion rate, conversion value and the distribution of clicks across destinations.
For SEO teams, the corresponding measurements are initial organic pixel depth, scroll requirement and organic CTR. Only then can the commercial gain of a larger ad format be compared with the visibility cost imposed on results beneath it.
The SERP is becoming a competition for interface area
Google’s mobile sitelink experiments show how search advertising can evolve without changing the underlying auction or introducing a completely new ad product. A familiar asset can become materially more prominent simply through layout.
The September 27 test is still just that: a test. Darker vertical links, the left-side margin and image-enhanced variants have been observed, but Google has not announced a rollout or published performance data.
For advertisers, the immediate task is to maintain strong, distinct sitelink assets and measure performance at the asset level. For organic teams, the lesson is complementary: monitor how much of the mobile viewport paid search occupies, because a stable ranking can become less visible when the ad above it grows.