Link Quality & Risk
Nofollow Links
A hyperlink with a rel="nofollow" attribute, telling search engines not to pass ranking credit to the destination page.
What Is Nofollow Links?
A nofollow link is a hyperlink that carries a `rel="nofollow"` attribute in its HTML, explicitly instructing search engines not to pass ranking value (link equity) through that link to the destination page. The attribute was introduced specifically to give site owners a way to link to something — for legitimate reasons, like citing a source or allowing user comments — without that link being interpreted as an unqualified editorial endorsement worth passing ranking credit for. Nofollow is commonly applied to several categories of link: user-generated content like blog comments and forum posts (where the site owner has no control over what gets linked), paid or sponsored placements (which use a more specific `rel="sponsored"` attribute today, but nofollow was historically used for this too), and any link the site owner simply doesn't want to vouch for. It's worth noting that search engines have said nofollow links may still be used as a weaker signal in some contexts, and they can still drive real referral traffic and brand exposure even though they don't pass the same ranking credit as a dofollow link.
Why Nofollow Links Matters for SEO
Controls what a site vouches for
Nofollow lets site owners link out for legitimate reasons — citations, comments, disclosure — without those links being read as a full editorial endorsement.
Guideline compliance for paid content
Marking sponsored or paid links appropriately (nofollow or sponsored) is required to stay within search engine guidelines around disclosure.
Still valuable beyond pure ranking signal
Nofollow links can drive genuine referral traffic and brand visibility even without passing the same direct ranking credit as a dofollow link.
A Simple Example
A news site allows reader comments on its articles, and every link a commenter posts is automatically marked `rel="nofollow"`. This lets the site preserve open commenting without effectively endorsing — in a ranking sense — whatever links random visitors choose to post.
Best Practices
- Use nofollow (or the more specific sponsored/UGC attributes) appropriately for paid content and user-generated links.
- Don't dismiss nofollow links entirely — they can still contribute referral traffic and brand awareness.
- Disclose sponsored content honestly using the correct rel attribute rather than presenting it as an ordinary dofollow link.
Common Mistakes to Avoid
- Failing to mark paid or sponsored links appropriately, risking a guideline violation.
- Assuming nofollow links have zero value and ignoring opportunities that would still drive real traffic.
- Applying nofollow indiscriminately to all outbound links out of excessive caution, when many outbound citations are genuinely fine as dofollow.
Key Takeaways
- Nofollow is a rel attribute telling search engines not to pass ranking credit through a link.
- It's commonly used for user-generated content, paid links, and content a site doesn't want to endorse.
- It exists to help with guideline compliance, particularly around disclosure.
- Nofollow links can still provide real referral traffic and brand exposure.