What is a Nofollow Link?
A nofollow link is a special attribute you can add to an HTML link tag. It tells search engines like Google to ignore that link when calculating page rank and authority. Think of it as a polite suggestion to search engines: "Don't follow this link and don't pass any SEO value through it."
The attribute looks like this in code:<a href="example.com" rel="nofollow">Link Text</a>. Google introduced thenofollowattribute in 2005 to combat comment spam. Before this, spammers would often drop links in blog comments to gain SEO benefits.
Over time, Google updated its guidance. Whilenofollowused to be a directive, it's now considered ahint. This means Google might still choose to crawl or consider the link, but it generally won't pass PageRank. Other specific attributes likesponsoredandugc(user-generated content) were introduced later for more specific use cases.
Why Nofollow Links Matter for SEO
Nofollow links are crucial for maintaining the integrity of the web and preventing link manipulation. Without them, SEO could be easily gamed by creating countless low-quality links. They help ensure that only genuinely valuable and editorially given links contribute to a site's authority.
From your perspective, using nofollow correctly helps you avoid penalties. If you sell links or receive payment for links, making them nofollow (orsponsored) is a must. Failing to do so can result in a manual action from Google, which can severely impact your search rankings. For example, a site that sells dozens ofdofollowlinks for money might see a 50% drop in organic traffic.
They also help manage your site'slink equity. While nofollow links don't pass PageRank, they don't necessarily dilute it either. You can judiciously use nofollow on internal links to guide Googlebot to your most important pages, though this is a more advanced strategy.
How to Use Nofollow Links
Mark paid links: Any link where you received payment or a product in exchange for the link must benofolloworsponsored. This includes affiliate links.
User-generated content: Links in comments, forum posts or guest book entries should usenofolloworugc. This prevents spammers from exploiting your site.
Untrusted content: If you link to a page you don't fully endorse or trust, usenofollow. This protects your site's reputation.
Internal links (rare): For very specific technical SEO reasons, you might nofollow some internal links. This is less common now that Google treats it as a hint.
Common Mistakes
Nofollowing all external links: This is usually unnecessary and can make your site look less credible. It also hinders the natural flow of link equity across the web.
Forgetting to nofollow sponsored links: This is a policy violation and can lead to penalties from Google. Always declare paid relationships.
Using nofollow for internal links to hide thin content: Google can still find and index those pages. Usenoindexin yourrobots.txtor meta tags for this purpose.
Confusingnofollowwithdisavow:Nofollowis for links you add on your site.Disavowis for telling Google to ignore bad links pointing to your site.