When you link to other sites from your content, every link passes some authority to the destination. The mechanism is generally good. Strong sites linking to other strong sites builds the web ecosystem that everyone benefits from. But sometimes you want to link without passing authority. Maybe you are linking to a competitor for comparison purposes. Maybe you are linking to a paid placement. Maybe you are linking to user generated content you cannot fully vouch for. Nofollow attributes handle these situations by telling search engines not to pass authority through specific links.
For business owners managing websites, knowing when and how to use nofollow attributes helps you handle external linking properly. The attributes have specific purposes that affect both SEO and compliance with search engine guidelines. Strong implementation uses nofollow appropriately while preserving the value of links that should pass authority.
This guide covers what nofollow attributes are, when to use them, and how they affect SEO when implemented correctly.
What Nofollow Attributes Actually Are
Nofollow is an HTML attribute added to specific links that tells search engines not to pass authority through those links. The attribute appears within the link code as rel equals nofollow.
The default behavior for links is to pass authority. Without nofollow attributes, every link from your content to other sites passes some link equity to those destinations. The behavior matches how the web naturally works as a system of connected resources.
Nofollow modifies this default behavior for specific links. The attribute does not prevent users from clicking the links or visiting the destinations. It only affects how search engines treat the links for ranking purposes.
Google introduced nofollow originally to combat comment spam. Sites struggling with spam comments could use nofollow on comment links to remove the SEO incentive for spammers. The mechanism has since expanded to handle various other situations.
In 2019, Google announced that nofollow became a hint rather than a strict directive. Search engines may sometimes consider nofollow links for ranking purposes despite the attribute. The change made nofollow less absolute than it originally was while preserving its general purpose.
When to Use Nofollow Attributes
Several specific situations call for nofollow implementation.
Paid Links & Sponsored Content
When you receive payment for placing links, those links should be marked as nofollow or use the more specific sponsored attribute. The marking distinguishes paid placements from genuine editorial recommendations.
Google guidelines require disclosure of paid links through nofollow, sponsored, or other appropriate attributes. Sites that do not properly mark paid links can face penalties.
User Generated Content
Links in user generated content should typically use nofollow or the ugc attribute. Comments. Forum posts. User reviews with links. Each represents content you did not write and cannot fully vouch for.
The nofollow protects against spam links from users while limiting your responsibility for content others produce on your platform.
Affiliate Links
Affiliate links where you earn commissions from referred sales should typically use nofollow. The financial relationship makes the links different from genuine editorial recommendations.
Strong affiliate marketing practices include proper nofollow implementation alongside disclosure of affiliate relationships.
Untrusted Content
Links to sites you do not fully trust can use nofollow to limit any negative association. Sites with questionable practices. Sites you are referencing critically. Sites where you are documenting issues rather than recommending. Each can warrant nofollow.
Login & Sign Up Pages
Some sites use nofollow on links to login pages, sign up pages, and similar pages that do not need to receive link equity. The implementation preserves equity for content that benefits from it.
Embed Codes That Generate Links
Widgets and embed codes that generate links automatically can use nofollow. The implementation prevents large scale link generation from manipulating SEO. Embeddable infographics, calculators, and similar tools often include nofollow attributes in their embed code.
How Nofollow Works in Practice
Several practical considerations affect how nofollow attributes work.
The PageRank Sculpting Issue
In early implementations, nofollow could be used to redirect PageRank flow through pages by selectively marking some links as nofollow. The practice was called PageRank sculpting.
Google changed how nofollow affects PageRank flow to eliminate sculpting benefits. The change means nofollow no longer redirects equity to other links on the page. The equity for nofollowed links is essentially lost rather than redistributed.
This means using excessive nofollow does not provide the benefits some early SEO practitioners hoped for. Nofollow should be used purposefully rather than strategically.
The 2019 Hint Change
Google’s announcement that nofollow became a hint rather than directive changed how the attribute works in subtle ways. Search engines may consider nofollow links for ranking and crawling purposes in some situations.
The practical effect for most sites is small. Nofollow still serves its core purposes for paid links, user generated content, and untrusted destinations. The change just makes the attribute slightly less absolute.
The Sponsored & UGC Attributes
Google introduced more specific attributes alongside nofollow. The sponsored attribute specifically marks paid placements. The ugc attribute specifically marks user generated content. Each provides clearer signals than generic nofollow.
Strong implementation uses the most specific attribute that applies. Sponsored for paid links. Ugc for user generated content. Nofollow for other situations that warrant it. The specificity helps search engines understand link contexts more accurately.
Implementation Mechanics
Nofollow attributes appear within the rel attribute of link tags. The syntax looks like rel equals nofollow with the attribute in quotes. Multiple rel values can appear together, like rel equals nofollow sponsored.
For CMS users, plugins typically provide options to add nofollow attributes through interfaces rather than requiring direct HTML editing. WordPress SEO plugins commonly include nofollow controls.
When Not to Use Nofollow
Several situations make nofollow inappropriate or counterproductive.
Genuine Editorial Links
Editorial links to authoritative sources should generally not use nofollow. The links represent genuine endorsements and benefit from passing authority. The natural web behavior produces value for everyone.
Marking all external links as nofollow misses the point of how the web works and may signal manipulation to search engines.
Internal Links
Internal links within your own site should not use nofollow. Internal linking distributes authority within your site to support overall rankings. Nofollow on internal links prevents this distribution without producing benefits.
Links to Sites You Are Citing
When you cite authoritative sources to support your content, the links should pass authority. The citations contribute to web ecosystem value. Strong content cites sources without nofollow attributes.
Strategic Nofollow Use
Some early SEO practices involved selective nofollow to manage how authority flowed. The practices no longer produce benefits. Strong implementation uses nofollow for its genuine purposes rather than strategic positioning.
How to Implement Nofollow
Several practices implement nofollow effectively.
Use Specific Attributes
When situations fit specific attributes, use them. Sponsored for paid placements. Ugc for user generated content. The specificity provides clearer signals than generic nofollow.
Apply Through CMS Features
Most content management systems include nofollow features through plugins or built in functionality. The interface based application is easier than direct HTML editing for most users.
Configure User Generated Content Systems
Comments. Forum software. Other user generated content systems. Each typically includes options to apply nofollow automatically to user submitted links. Strong implementation enables these options.
Mark Affiliate Links Consistently
Affiliate marketers should implement nofollow systematically across all affiliate links. The consistency supports compliance with disclosure requirements and search engine guidelines.
Audit External Links Periodically
Periodic audits of external links identify links that need nofollow added or removed. New paid relationships. Changed source trust. Each can warrant attribute adjustments.
Common Nofollow Mistakes
Several patterns produce problems with nofollow usage.
Marking all external links as nofollow misses how the web naturally works. Strong sites pass authority through editorial links while using nofollow for specific situations.
Forgetting to mark paid links as nofollow or sponsored can produce guideline violations. Strong implementation marks paid placements consistently.
Using nofollow on internal links wastes link equity without producing benefits. Strong implementation passes equity through internal linking.
Trying to use nofollow for PageRank sculpting no longer produces benefits. Strong implementation uses nofollow for its actual purposes.
Inconsistent nofollow application across similar situations produces inconsistent signals. Strong implementation applies nofollow systematically based on link types and situations.
Failing to use the more specific sponsored or ugc attributes when they apply misses opportunities for clearer signaling. Strong implementation uses the most specific attribute that fits.
What This Means for Your Site
If you use external links in your content, nofollow implementation deserves attention for appropriate situations.
Mark paid links and sponsorships with sponsored or nofollow attributes. The marking maintains compliance with search engine guidelines.
Apply nofollow or ugc to user generated content links. The implementation prevents spam manipulation while limiting your responsibility for content from others.
Use nofollow for affiliate links consistently. The implementation supports compliance while preserving the editorial trust your other content builds.
Avoid using nofollow on genuine editorial links. The natural authority flow benefits both you and the broader web ecosystem.
Audit periodically to ensure nofollow application matches current circumstances.
For business owners, nofollow implementation is part of responsible link management. The work supports compliance with guidelines while preserving the link relationships that benefit SEO.
Bringing It Together
Nofollow attributes serve specific purposes in managing how search engines treat links. Strong implementation uses nofollow for paid links, user generated content, untrusted sources, and other situations that warrant it. Weak implementation either fails to use nofollow where needed or applies it too broadly to genuine editorial links.
For business owners, the practical move is to understand when nofollow applies and use it appropriately rather than as a blanket approach. The differences between situations matter. Specific attributes like sponsored and ugc provide clearer signals than generic nofollow when they apply.
Mark paid links. Handle user generated content properly. Manage affiliate links consistently. Preserve authority flow through genuine editorial links. Each practice supports the kind of link management that protects your SEO while supporting your responsibilities for compliance.
The sites that manage their linking well use nofollow purposefully rather than carelessly. Match your approach to this discipline, and your link practices support both your SEO and your relationships with the broader web. Take nofollow seriously as the specific tool it is, and your business benefits from link management that aligns with how search engines actually work.