YouTube description affiliate links: the complete guide.

YouTube is one of the largest affiliate marketing platforms in the world by revenue, and also one of the worst places for link hygiene. Once a video goes live, its description becomes a write-once, read-never document. The creator moves on to the next upload; the old description sits quietly for years, its links slowly dying.

This guide covers what YouTube allows, where creators actually put links, why those links rot, and the workflow that keeps them working. For the other major platforms, see the Instagram and TikTok guides. The failure modes are different but the core pattern is the same.

YouTube's rules on affiliate links

Required disclosure

YouTube requires creators to disclose paid relationships, and many jurisdictions (US FTC, UK ASA, EU directives) require affiliate-link disclosure specifically. YouTube's Partner Program rules reinforce this. The safest format: state "[includes affiliate links]" or "[ad]" near the links themselves, not only in a general disclaimer at the bottom of the description.

Shortened and cloaked links are allowed

YouTube does not flag shortened or cloaked URLs by default. Bit.ly, amzn.to, go.yourdomain.com, and managed URLs all pass. The platform cares about destination safety, not URL format.

Spammy links are flagged

What gets flagged: links that mislead (clickbait title linking to unrelated products), links to malware or phishing, excessive external links (dozens in one description), adult content. Normal affiliate links to real products are fine.

Where creators actually put links

Video description (the default)

Most clicks come from the description box. Creators say "link in description," viewers scroll, click. Works on desktop and mobile. The catch: YouTube collapses the description after the first ~3 lines. Anything below that is hidden until the viewer taps "Show more."

Pinned comment

A pinned comment is always visible at the top of the comment section. Some creators put affiliate links there as a backup or primary location. Works well for shorter lists (2-3 items). Avoids the 3-line truncation of the description.

YouTube cards and end screens

These exist but don't support direct affiliate URLs for most creators. YouTube only permits cards to link to "associated websites" (verified via the dashboard) and other YouTube content. Workaround: link a card to your own website's landing page, where affiliate links live.

Channel "About" section

For evergreen links (a mic or camera you recommend across many videos), the About section is useful. Viewers find it when they go looking for "what mic does this creator use." Lower traffic, higher intent.

Why YouTube descriptions are a link graveyard

You don't re-open old videos

Once a video is uploaded and optimized, creators almost never go back to edit the description. Yet the affiliate links inside those descriptions keep accumulating. And decaying. For years. A creator with 200 videos may have 500+ affiliate links across their channel, most of them written into descriptions at upload time and never touched again.

Mobile editing is brittle

YouTube Studio on mobile is usable but not enjoyable. Editing a description from your phone, without accidentally breaking another link, is a slow careful operation. Most creators deliberately avoid it.

First-3-lines collapse hides most links

Unless the viewer taps "Show more," only the first ~3 lines of a description show on mobile. If your affiliate link is the 7th line down, it may as well not exist for the majority of your audience.

Amazon is especially fragile here

Amazon product URLs rotate ASINs and products move between listings. See why Amazon links break more often. Because YouTube descriptions never get re-audited, a two-year-old review video can have every Amazon link in its description quietly dead (see also: why YouTube affiliate links return 404).

Best practices for affiliate links on YouTube

Use managed URLs

Post go.affiliyo.com/headphones (or a cloaked URL on your own domain) instead of the raw affiliate URL. When the destination breaks or the ASIN rotates, you update the destination once and every video description keeps working. See managed URLs explained.

Disclosure line above the first link

"[affiliate links below. At no cost to you I get a small commission]" or similar. Position it above the links so it's visible in the first 3 lines when possible.

Prioritize top 3 links

The first 3 lines are the only ones most mobile viewers see. Put your best-performing affiliate link there. Secondary links can go further down, but accept they'll convert less.

Short slugs for mobile

Even after cloaking, a long URL wraps onto 2 lines in the description. Keep managed URL slugs short (6-12 characters). Better for scanning.

The workflow that scales

For a channel with 20+ videos, the only sustainable approach is to treat affiliate links as infrastructure:

• Track every affiliate link across every video in one place, not in each individual description.
• Monitor destinations actively, not reactively. Get alerted when a product goes unavailable, not when a viewer emails you.
• Fix destinations in one place (the monitoring dashboard), not in each individual video.

This is what Affiliyo does. Add the links from your top 10 videos on Free. See the leak. Decide if you want monitoring on all of them.