Dofollow / Nofollow

Every hyperlink carries an implicit or explicit attribute that tells search engines whether to credit it for ranking purposes.

Dofollow links are links with no explicit attribute — the default state. These links pass authority (also called link equity or PageRank) from the referring domain to your site. Google's crawlers follow these links, process them as votes of confidence, and factor them into ranking algorithms.

Nofollow links carry the rel="nofollow" attribute in the HTML: <a href="https://example.com" rel="nofollow">link text</a>. This attribute tells Google: "I'm linking to this site, but I don't endorse it enough to pass authority." Google officially treats nofollow links as signals to discount or ignore for ranking purposes.

Sponsored and UGC attributes are newer labels: rel="sponsored" (for paid links, ads, affiliate links) and rel="ugc" (for user-generated content like comments, forum posts, social shares). These allow publishers to be explicit about link intent without using nofollow's catch-all discount.

Nofollow was introduced in 2005 to combat comment spam and artificial link schemes. Before nofollow, spammers flooded blog comments and forum posts with keyword-rich links, gaming search rankings. The rel="nofollow" attribute gave publishers a way to allow comments (preserving user engagement) without passing authority to spam links.

Today, nofollow appears in legitimate contexts:

• Comment sections — forums, blog comments, social media platforms apply nofollow to user-submitted links
• Paid partnerships — affiliate links, sponsored content, ads should carry rel="sponsored" (or legacy nofollow)
• Untrusted sources — links you want to include but don't fully endorse get nofollow
• Policy requirements — Google's Webmaster Guidelines require nofollow or sponsored on paid links
• Internal linking strategy — some sites use nofollow on login pages, shopping carts, or low-value internal links to concentrate ranking power on core content

Publishers who don't explicitly mark paid links risk manual penalties. Google's algorithm actively penalizes hidden sponsored links.

The distinction matters for how backlinks affect your rankings. A backlink from a high-authority domain passes roughly 10-100x more ranking signal if it's dofollow than nofollow.

For link building, focus on securing dofollow links from topical, authoritative sources — industry publications, relevant directories, chamber of commerce listings, guest posts on established blogs. A single dofollow link from a domain with an established backlink profile is worth more than 50 nofollow links from low-quality directories.

Nofollow links still have value: they drive referral traffic, increase brand visibility, and signal relevance (which LLMs and AI Overviews may use for citation ranking, even if Google doesn't count them for PageRank). A nofollow link from TechCrunch is worth far more than a dofollow link from a spam site with no traffic.

The distinction broke down slightly in 2019 when Google announced it treats nofollow as a ranking signal hint rather than a strict instruction. This means Google may choose to pass authority through nofollow links in specific contexts — for example, a nofollow link to a brand-new site may still influence its initial ranking potential. Treat nofollow as a strong downweight, not a complete signal kill.

LLMs and AI Overviews cite domains with strong authority profiles. The authority signal still derives largely from dofollow backlinks — the transitive web of trust that Google's PageRank algorithm modeled in 1998.

When ChatGPT or Perplexity answer a local business question, the recommended domains typically have strong dofollow backlink profiles from authoritative sources. A business with hundreds of dofollow links from relevant local news sites, industry associations, and established directories will be cited more frequently in AI outputs than a competitor with a weaker link profile, even if both have identical content quality.

This doesn't mean nofollow links are worthless for AI visibility — a nofollow link from a major publication still increases brand awareness and may indirectly boost topical authority signals. But for direct ranking impact in both search and AI results, dofollow links from authoritative domains remain the foundational currency.

Use the Backlinks API to audit which of your backlinks are dofollow vs nofollow. Quality APIs return this attribute for every detected backlink, letting you quickly identify your strongest link sources.

If you're publishing content that links to other sites, be explicit about intent. Internal links to core content pages should be dofollow (the default). External links require judgment:

• Trusted sources you fully endorse → dofollow (default)
• Sponsored content, affiliate links, paid partnerships → rel="sponsored" (or nofollow for legacy sites)
• User comments, forum posts, community content → rel="ugc" or nofollow
• Untrusted or low-quality sources you mention for context → nofollow

Be consistent. If you nofollow 95% of your external links out of caution, you're signaling that your site exists in isolation, which undermines topical authority signals. Legitimate publishers link to other legitimate sources.