What is an affiliate link?
An affiliate link is a unique trackable URL that tells you exactly which creator generated a sale. If somebody clicks the link, buys the product, and checks out, the purchase gets attributed automatically to that influencer, and they earn commission. The brand sees revenue tied to a specific partnership.
Before affiliate tracking became mainstream, brands mostly judged campaigns through reach, likes, or screenshots creators sent after posting. Now a skincare brand can see that Creator A drove $2,300 in sales while Creator B generated plenty of engagement but barely converted. Completely different conversation.
You’ve definitely seen these links before. Amazon creators use them everywhere. Beauty influencers drop them under “get ready with me” videos. Fashion creators add them to Stories after outfit breakdowns.
So, what is an affiliate link in practice? Let’s say a creator posts a TikTok about serum. Her audience clicks the link in bio. Twenty people buy within 24 hours. The brand gets attributed sales data instantly, and the influencer receives commission automatically without anyone manually calculating payouts in spreadsheets later.

UTM link vs affiliate link
It can be confusing, especially if you’re setting this up for the first time. One person says “tracking link,” the performance marketer starts talking about affiliate sales, and suddenly everyone is looking at different numbers in different dashboards.
Here’s the easiest way to think about them.
A UTM link tells you how visitors arrived at the page, whereas an affiliate link shows which click generated the sale.
Here’s a full breakdown:
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Type of link
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UTM link
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Affiliate link
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Main purpose
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Track traffic and campaign performance
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Track sales and creator commission
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Best for
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Awareness campaigns, traffic analysis
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Performance influencer marketing and affiliate programs
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Shows clicks and traffic sources
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Yes
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Usually limited
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Shows purchases and revenue
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No
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Yes
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Data usually appears in
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Google Analytics (GA4)
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Impact, Amazon Associates, PartnerStack
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Example parameter
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utm_source=instagram
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ref=emma15
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Can be combined together
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Yes
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Yes
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Teams often combine both into a single URL so they can see traffic, conversions, and creator-driven revenue in the same place.
How affiliate links work

Amazon affiliate link example. Source.
If we look inside a real creator affiliate link, here’s what it contains:
Looks a bit chaotic, but it’s actually quite functional once you know what each piece means.
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amazon.com
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The main domain. In this case, the Amazon website.
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/dp/B0C2C9QT91
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The product identifier path. B0C2C9QT91 is the ASIN (Amazon Standard Identification Number) pointing to the exact product page.
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th=1
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Product variation parameter. Usually controls version, seller, or configuration selection.
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linkCode=sl1
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Internal Amazon affiliate tracking parameter showing the link type or tracking format used.
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tag=joshburnste0e-20
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The affiliate or creator ID. This is the most important attribution parameter because it tells Amazon which creator should receive commission if a purchase happens.
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linkId=7dc68c80a1b5e65e488e7199b19efcb7
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Additional tracking identifier used internally by Amazon for attribution and reporting.
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language=en_US
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Language/localization parameter for the user session.
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ref_=as_li_ss_tl
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Amazon internal referral and affiliate tracking parameter.
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So how does it work? An affiliate partner recommends a product or service and shares their unique affiliate link on their platforms – blog, YouTube, Instagram, TikTok, or others.
The moment somebody clicks the link, the system remembers where that visitor came from and starts the attribution timer (often called ‘cookie window’). If the clicker buys before this period expires (from 24 hours to 30-60 days), the sale is automatically credited to the creator.
No purchase? The window expires, the attribution disappears, and no commission gets paid.
Then another person clicks the same link tomorrow, a new window opens again and the whole cycle restarts from zero.
That’s why old YouTube videos can still generate affiliate revenue years later. The content stays online, new viewers keep discovering it, and every new click opens a brand-new attribution window.
What is a ‘cookie window’, and how does it work?
A ‘cookie window’ is basically a period during which a creator can still receive credit for a sale after somebody clicks their affiliate link.
When someone clicks an affiliate link, the affiliate platform places a small piece of tracking information, called a cookie, in the customer’s browser. That cookie helps the platform remember which creator originally sent the visitor to the website. If the customer purchases during the attribution window, the creator receives the commission.
The problem with this type of tracking is that it has become much less reliable over the last few years. Privacy regulations like GDPR now require websites to ask users for permission before storing many tracking cookies. At the same time, browsers like Safari and Chrome increasingly restrict third-party cookies – cookies created by external advertising or affiliate platforms rather than by the website the customer is directly visiting.
In practice, that means the browser may block or delete the tracking cookie before the affiliate platform can properly attribute the sale. That’s why major affiliate platforms now use server-to-server (S2S) tracking and hybrid attribution systems instead. The brand’s server communicates directly with the affiliate platform’s server behind the scenes. Some platforms also combine first-party cookies, session data, or cross-device attribution to improve accuracy further. That makes attribution much more accurate and resilient against browser restrictions, ad blockers, and deleted cookies.

You’ll still hear marketers use the phrase “cookie window” today, even when programs actually use newer attribution methods underneath. In most cases, they simply mean the attribution period during which a creator can still receive credit for the conversion.
How long ‘cookie window’ lasts
Creators usually prefer longer ‘cookie windows’ because they increase the chance of getting paid. A 30-day period gives followers time to browse, forget, come back next week, compare products, and still purchase with attribution attached to the influencer.
Brands are more cautious about that because it often distorts the attribution and inflates payout cost. Let’s say somebody clicks a creator’s affiliate link today, then spends the next three weeks seeing retargeting ads, email campaigns, Google search results, and maybe content from three other influencers before finally buying. If the original cookie is still active, the first creator may still receive full commission.
Which is why programs structure attribution differently:
- Amazon Associates often uses a 24-hour cookie window
- Many ecommerce brands prefer 7- or 30-day attribution
- SaaS affiliate programs sometimes go up to 90 days because customers need longer to decide
First-click vs last-click attribution
Another problem with attribution in affiliate marketing is that clicks alone can’t always show who actually influenced the purchase, especially when brands run multiple channels at the same time.
Imagine somebody discovers a supplement through a fitness creator on YouTube, clicks the affiliate link, leaves, compares alternatives, then finally buys a week later after opening the brand’s discount email. Technically, the email campaign may receive the final attribution even though the creator generated the original interest and product discovery.
This is last-click attribution in action: whichever link is clicked last receives the commission. But real customer journeys rarely work that neatly.
According to DataSlayer, 41% of marketers still rely on single-touch attribution models because they’re easier to track and report across platforms.
At the same time, industry is shifting away from pure single-touch attribution. Based on The Global State of Affiliate Marketing 2025 report by Impact (one of the largest affiliate platforms), 94% of brands are already experimenting with or considering alternative attribution models: mixed media modeling (MMM), first-party data, and server-side tracking to better understand how creators influence conversions alongside paid ads, search, email, and organic traffic. Only 22% still use first-click attribution, while just 19% rely on pure last-click attribution today.
Image Source.
Special case: how to get an Amazon affiliate link
Originally, Amazon was built for creators and publishers running affiliate traffic independently, not for brands managing structured influencer campaigns. That’s why there are now several different systems living inside the Amazon at the same time.
Amazon Associates vs Amazon Influencer Program
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Amazon Associates is the classic affiliate program. Creators join the platform, generate their own product links, and earn commission from qualifying purchases tied to their account.
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The Amazon Influencer Program adds storefronts on top of that. Creators can build curated Amazon pages with product recommendations, livestreams, collections, and category lists tied to their audience.
For brands, though, there are usually two different workflows.
Some simply send creators the Amazon product page or the ASIN (Amazon Standard Identification Number, basically Amazon’s unique product ID). Then the creator generates their own affiliate link through Amazon Associates and publishes it independently. This is extremely common in open creator ecosystems, especially on YouTube, TikTok, blogs, or Amazon storefront content.
How brand marketers get creator-led Amazon affiliate links via Levanta or Brand Referral Bonus
Other brands run creator campaigns directly through platforms like Levanta, Amazon Attribution, or integrated affiliate systems. In that setup, the brand usually generates the tracking links internally and sends creators ready-to-use URLs instead.
That approach gives brands much cleaner attribution, more standardized reporting, and better visibility into which creators actually drive sales.
And many Amazon-first brands prefer Amazon checkout anyway because conversion rates are often higher there. Customers already trust the platform. Prime shipping removes friction. Mobile checkout is faster than many DTC sites.
The tradeoff is data visibility. Compared to Shopify or a brand-owned ecommerce store, Amazon gives brands much less access to the full customer journey, retention behavior, or long-term LTV data.
So which setup is better? A lot of it comes down to what the brand cares about more. Some ecommerce teams want customer emails, retention data, and full visibility into the buying journey, so they push creator traffic to their own website. Others care more about fast conversion and lower checkout friction, which is why they send people straight to Amazon instead. And many larger brands now do both at the same time, depending on the campaign, product category, or creator audience.
Affiliate links and SEO: do they hurt your rankings?
Many marketers assume their affiliates’ links may damage rankings or trigger Google penalties. But the global engine doesn’t really care about them the way people think it does.
Affiliate links are completely normal on the web. The problem is not the links themselves but a weak content wrapped around them, said Google’s John Mueller back in 2023.
John Mueller's 2023 statement. Watch the full video.
So, if you’re wondering, “Do affiliate links hurt SEO?” the short answer is no. There’s a huge difference between a creator publishing a real product review and a page built only to squeeze clicks out of search traffic.
A detailed comparison article. A tutorial. A YouTube breakdown showing how the product actually performs in real life. Completely fine.
Now compare that with a page containing copied Amazon descriptions, generic stock photos, and twenty “Buy now” buttons with almost no original commentary. That absolutely can hurt rankings because the page adds almost nothing useful for the reader.
Google’s Helpful Content Update pushed this even further. Thin affiliate pages became much riskier, especially for creators trying to scale SEO traffic aggressively without adding original expertise or experience.
What Google actually wants creators to do
When creators publish affiliate content on blogs or websites, the affiliate URL itself usually gets tagged inside the page code.
That’s where attributes like these appear:
- rel="sponsored" for affiliate or paid partnerships
- rel="nofollow" when the site does not want to pass SEO authority through the link
- rel="ugc" for user-generated content
Usually, the creator, publisher, or whoever manages the website handles this part technically. But smart influencer teams still include these requirements inside creator briefs so nothing gets missed later.
A running creator, for example, might link to marathon shoes like this:
<a href="brandlink.com" rel="sponsored">Best running shoes for marathon training</a>
That tiny tag tells Google the relationship is commercial, which keeps the setup aligned with search guidelines.
Brands should also encourage creators to:
- disclose affiliate relationships clearly
- write original commentary around products
- avoid stuffing pages with excessive links
- use descriptive anchor text instead of vague “click here” buttons
Read also: Influencer SEO: The Smart Growth Strategy for 2026