A buying guide that earns from affiliate links has to be commercial enough to pay for itself and independent enough that a reader trusts the ranking. Google has written down what it wants from review pages, how to mark links that earn you money, and what it counts as a thin affiliate page. This article sets out what each document says and where the pages are silent. Every page cited was fetched on 6 November 2026.
What Google says a good review page contains
The guidance, Write high quality reviews (last updated 2025-12-10), lists best practices and says to follow as many as you are able.
Paraphrased, the list asks you to evaluate from the user’s perspective and show you know the subject. It asks for evidence of your own experience, such as visuals, audio or links, and for quantitative measurements of how something performs in different categories. It also asks you to explain what sets a product apart, say which option suits which circumstances, and discuss benefits and drawbacks based on your own original research.
Three points matter most for “best X” pages. Google says to describe design choices and their effect on the user beyond what the manufacturer says. It says that when you recommend something as the best overall, or best for a purpose, you should include why you consider it the best, with first-hand supporting evidence. It also says ranked lists should contain enough useful content to stand on their own, even if you also write separate in-depth reviews.
It suggests considering links to multiple sellers, so the reader can buy from their preferred merchant, and closes by saying to focus on quality and originality, not length.
The people-first content page (Creating helpful, reliable, people-first content, last updated 2026-10-05) adds one specific point. It says that with product reviews, it can build trust when readers understand how many products were tested, what the results were and how the tests were conducted, accompanied by evidence of the work such as photographs.
How to mark affiliate links with rel=”sponsored”
Reviews often use affiliate links, and the review guidance acknowledges this directly: if a reader follows the link and buys, the creator is rewarded by the seller. It points anyone doing this to Google’s position on affiliate programs, the thin affiliation section covered below.
The mechanics sit in Qualify your outbound links to Google (last updated 2025-12-10). It says to mark links that are advertisements or paid placements, commonly called paid links, with rel="sponsored". It adds that nofollow was previously recommended for these links and is still an acceptable way to flag them, though sponsored is preferred.
The spam policies page (Spam policies for Google web search, last updated 2026-08-28) states the same position from the policy side. Google understands that buying and selling links is a normal part of the web’s economy for advertising and sponsorship, and says it is not a violation to have such links as long as they are qualified with nofollow or sponsored. It also lists, among link spam, buying or selling links for ranking purposes, including sending someone a product in exchange for writing about it and including a link.
Two caveats are worth stating. First, neither page says an affiliate link is automatically a “paid link” in the sense of that wording; they speak of advertisements and paid placements, and the review guidance separately points to the affiliate programs position. We therefore cannot quote Google on the precise attribute it expects for every affiliate arrangement, and say only what the pages state. Second, the pages describe how Google treats the attribute, not what it does to rankings; neither promises a ranking effect from using it. For the wider question of what an outbound link vouches for, see our article on outbound links, which we will not repeat here.
The thin affiliation policy in Google’s own words
The spam policies define thin affiliation as publishing content with product affiliate links where the product descriptions and reviews are copied directly from the original merchant, without any original content or added value. Affiliate pages can also be considered thin if they are part of a program that distributes the same content across a network of affiliates without additional value. Google describes such sites as often appearing to be cookie-cutter sites or templates with the same or similar content replicated within a site or across multiple domains or languages.
The policy is just as explicit about what it does not say. Not every site that takes part in an affiliate programme is a thin affiliate. Good affiliate sites add value through meaningful content or features, and Google’s examples are extra information about price, original product reviews, rigorous testing and ratings, navigation of products or categories, and product comparisons. Elsewhere in the same document, the site reputation policy lists Using affiliate links throughout a page, with links treated appropriately
among examples that are not inconsistent with that policy.
On consequences, the policies page says generally that sites violating its policies may rank lower or not appear in results at all. It does not give a threshold, a count of affiliate links or a percentage of original text at which a page becomes thin.
A hypothetical page, read against the three documents
Take a hypothetical guide to the best running shoes. In one version, each entry repeats the manufacturer’s description and ends in a button to the affiliate network: copied descriptions, nothing added.
In another, each entry shows photographs from real use, gives measured figures such as weight, says who each pair suits, and explains why one is ranked above another. The affiliate links carry rel="sponsored". Those features map to Google’s examples of good affiliate pages. The example illustrates the documents; it says nothing about how either version would rank.
Common traps on comparison sites
- Feed-fed pages. Product text imported from a merchant or network feed is the copied content the policy names. If a template adds nothing beyond the feed, the page adds nothing beyond the merchant.
- Rankings with no reasons. Google asks for the reason a product is best, with first-hand evidence. A numbered list with scores that are never explained gives the reader nothing to check.
- Identical pages across domains or languages. The policy lists replication within a site, across domains or across languages as a sign of cookie-cutter sites.
- Unmarked links. Google’s spam policies say buying and selling links for advertising or sponsorship is not a violation as long as the links are qualified with
nofolloworsponsored. Decide whether each affiliate link is a paid placement, and mark those that are. - Lists that rely on other pages. Google asks that ranked lists contain enough useful content to stand on their own, even if you also publish separate in-depth reviews.
Where this fits at Cultured Digital
Deciding what to create, merge, update or remove, and setting editorial standards, sit within our plan the content guide. Product and category navigation falls under architecture, alongside internal linking. If a site’s older affiliate pages need an honest second look, that is the kind of question a focused audit begins with; we set out the evidence and do not promise rankings or traffic numbers. See also our articles on link building the spam policies allow, planning content from evidence, AI-generated content and review and hidden and injected links.