Affiliate links SEO comes down to one habit: add rel="sponsored" (or rel="nofollow") to every affiliate link, because Google asks for paid and affiliate links to be marked, and links marked this way do not hurt a site. What does hurt is the page around the links when it adds nothing of its own.
Below I explain what each rel value means, answer whether affiliate links help or harm rankings, show how to use the link tag builder on this page, and clear up the confusion between redirect links and cloaking.
Quick answer
The answer
Tagged affiliate links do not harm rankings. Untagged paid links can be treated as link spam.The rule
Use rel="sponsored" on affiliate links. rel="nofollow" is also accepted. Both are hints to the search engine.Time needed
Seconds per link with the builder below, or one setting in a link management plugin for the whole site.Cost type
Free. The tag is plain HTML.The risk
Hiding where a link goes, or showing search engines different content from readers, breaks spam rules and often program terms.
What rel values tell a search engine
The rel attribute sits inside a link and describes your relationship with the page you link to. Google's page on how to qualify outbound links lists the values it reads. Affiliate links are paid relationships, so they belong in the first row.
| Value | Meaning | Use on |
|---|---|---|
| sponsored | The link is an ad, a paid placement or earns you money | Affiliate links, sponsored posts, paid reviews |
| nofollow | Do not pass ranking credit; use when no other value fits | Older affiliate links, links you do not vouch for |
| ugc | User generated content | Links in comments and forum posts |
| noopener | Security setting for new tabs, not a ranking signal | Any link that opens in a new tab |
You can combine values with a space, for example rel="sponsored nofollow". Search engines treat sponsored and nofollow as hints rather than strict commands, which is fine. The point is that you have been honest about the link.
Do affiliate links hurt SEO?
Short answer: no, not when they are tagged and the page is useful. Having affiliate links does not make a page rank lower by itself. Plenty of pages full of tagged affiliate links sit at the top of results.
What does hurt is what Google's spam policies call thin affiliation: pages that carry product links but reuse the merchant's descriptions and add no original testing, comparison or insight. The links are not the problem there, the empty page is.
- Fine: a tested review with six tagged links to two different sellers.
- Risky: two hundred pages each holding one product photo, the maker's blurb and a buy button.
- Risky: untagged links you were paid to place, which look like an attempt to sell ranking credit.
Search staff have said in public that a site is unlikely to be penalised for a few missed tags, while still strongly recommending the markup. Treat that as reassurance about honest mistakes, not permission to skip it.
Do affiliate links help SEO?
Not directly. Linking out to a store passes nothing back to you, and sponsored links are not a ranking boost. The indirect help is real though: a review that points readers to more than one seller, with clear prices checked on the day, is more useful than one that pushes a single shop. Usefulness is what keeps a page ranking.
Do not add affiliate links just to have them. Two or three well placed links (after the verdict, in the comparison table, at the end) usually earn more clicks than a link in every paragraph, and they read better.
How to use the affiliate links SEO tag builder
The builder above writes a correct link for you and stores nothing. Here is a worked example.
- Paste your tracking URL, for example https://shop.example.net/kettle-500?aff=k77.
- Type the link text: Current kettle price at the kitchen store.
- Leave sponsored ticked. Tick nofollow as well if you like belt and braces. Tick open in new tab if you want readers to keep your page open.
- Read the output. With sponsored and new tab ticked, the builder gives you:
<a href="https://shop.example.net/kettle-500?aff=k77" rel="sponsored noopener" target="_blank">Current kettle price at the kitchen store</a>
If you untick both sponsored and nofollow, the builder shows a warning, because an affiliate link with no rel value is exactly what you are trying to avoid. Press copy and paste the result into the HTML view of your editor. For a site with hundreds of links, a link manager plugin that inserts the tag on every link is less work; the add affiliate links page covers that route.
Redirect links, cloaking and short links
Many affiliates send links through a short path on their own domain, such as yoursite.com/go/kettle, which then redirects to the long tracking URL. People call this link cloaking, but it is not what search engines mean by cloaking.
| Practice | What it is | Search engine view |
|---|---|---|
| Redirect or short link | A tidy URL that forwards to the tracking link | Fine when the reader ends up where the link text said |
| Cloaking | Showing search engines different content from what readers see | A spam policy violation |
| Sneaky redirect | Sending readers somewhere they did not expect | A spam policy violation |
Redirect links still need rel="sponsored" on the link in your page. Some programs also ban short links that hide the destination, so check the rules of every program first.
Never redirect search engines to one page and readers to another, and never use a redirect to send readers to a store the link text did not mention. That is the deceptive kind the policies target.
Affiliate link mistakes and fixes
| Problem | Fix |
|---|---|
| Editor strips the rel value when you save | Add it in the HTML view or use a plugin setting that adds it on output |
| Old posts have untagged links | Search your database for the tracking domain and update them in one pass |
| Link text says one store, link goes to another | Match the text to the destination every time |
| Links in email newsletters | Check program terms; some do not allow affiliate links in email |
| No disclosure near the links | Add a plain sentence before the first link |
Tags are for search engines, disclosure is for people
rel="sponsored" is invisible to readers. It does not replace telling them you earn a commission. Regulators such as the US FTC, the UK's ASA and India's ASCI expect a clear disclosure that people see before they click. See the affiliate disclosure guide for wording and placement, and the affiliate SEO hub for the rest of the ranking picture. Owners who earn from SEO tools themselves can read about SEO and website affiliate programs.
Do both on the same day you publish: tag the link, then write the disclosure line above it. Fixing them later across fifty posts is a chore you will put off.
Questions people ask
Does having affiliate links hurt SEO?
Not when they are marked with rel="sponsored" or rel="nofollow" and the page offers original value. Rankings suffer when the page is thin, copied or mass produced. The links themselves are not the issue.
Do affiliate links help SEO?
They do not pass ranking value back to you. They can make a page more useful when they point to several sellers and come after an honest verdict, and useful pages tend to rank better over time.
Should affiliate links be sponsored or nofollow?
Google prefers rel="sponsored" for affiliate and paid links and still accepts rel="nofollow". You can use both together. Either is far better than no tag.
Is link cloaking bad for SEO?
A short redirect link on your own domain is not search engine cloaking, as long as readers land where the link text promised. Cloaking means showing search engines different content from readers, which breaks spam policies. Some affiliate programs ban masking their links, so check the terms.
Do I need to tag affiliate links in old posts?
Yes, it is worth doing. Search your site for each program's tracking domain and add the tag in bulk. It is a one time job that removes a risk you do not need.
Does rel sponsored replace an affiliate disclosure?
No. The tag talks to search engines and readers never see it. Regulators expect a visible disclosure in plain words before the reader clicks.