Search feeds · also called styleId, search style, AFS style
Style ID
A style ID is the identifier of a search style saved in an AdSense account that controls how Google search ads and related search units look on a page.
Every Custom Search Ads request must include a styleId. It points to a search style stored in the publisher's AdSense account, and Google renders the ads and related search units according to that style. When a styleId is present, older styling settings in the page code are ignored.
The design means appearance is controlled from Google's side. A publisher cannot quietly restyle ads in its own code to make them blend into the page or look like navigation, which protects against accidental clicks and weak ad disclosure.
Control has tightened further. According to trade press reports, Google announced in March 2026 a limit of 100 style IDs per account, effective 3 June 2026, with each style ID holding one sub-style each for search ads, shopping ads and related search. In April 2026 it told publishers that custom styles would no longer be supported and that Google-managed Standard styles should be used instead.
For arbitrageurs this removes a lever. Colours, font sizes and layout of the related search block were once tested heavily to raise Lander CTR. Operators working through a feed provider are normally issued style IDs along with their channels.
Think of it like this
A style ID is like a uniform issued by head office. The shop chooses which approved uniform staff wear, but cannot sew its own.
Related terms
Channel ID (custom channel)
A channel ID is a label attached to search ad requests so that revenue and clicks can be reported separately for each page, campaign or traffic source.
Custom Search Ads (CSA)
Custom Search Ads is the Google AdSense code that lets a publisher request Google search ads for a query and display them on its own results page.
AdSense for Search (AFS)
AdSense for Search is Google's programme that lets approved publishers show Google search and shopping ads on their own search results pages and share the revenue.
Ad disclosure
Ad disclosure is the clear labelling of paid content as advertising, so people know when a link or listing is an ad before they click.
Lander CTR (keyword click rate)
Lander CTR is the share of landing-page visitors who click a keyword or related search term, taking them on to the page that shows search ads.
A/B testing
A/B testing is showing two versions of something to randomly split, similar audiences at the same time to learn which performs better.
Sources: Google Developers: Custom Search Ads reference, Google AdSense Help: Search ads parameter descriptions, PPC Land: Google ends AdSense for Search custom styles