Outbound Links

What Are Outbound Links?

When you link to the official Google Search Central documentation in an SEO article, you signal to Google: this content is part of a high-quality thematic context. Conversely, links to spam sites can damage your own trustworthiness. Place outbound links deliberately where users genuinely need more context — and use the nofollow attribute for links whose quality you cannot control.

Outbound links are links from your own website to external websites. Unlike backlinks (incoming links), outbound links don’t directly help your ranking — Google does not pass its “link power” through outbound links. However, outbound links are still important: they signal topical relevance and context (when you link to a thematically relevant source), improve the credibility of the page, and help users find more information. Especially on content pages (blog, knowledge pages), several outbound links to reputable sources are a quality signal.

Technically, outbound links use an <a href="[https](/en/glossary/https/)://external-site.com">Link Text</a> tag. By default, outbound links are “follow links,” meaning Google follows them and uses the linking as a relevance signal. With the attribute rel="[nofollow](/en/glossary/nofollow/)" you can prevent Google from following the link — this is useful for uncertain or uncontrolled links (e.g., in comment sections). Outbound links to spam sites can theoretically have a negative effect; links to high-quality sources have a positive effect. A website that only links to spam could itself appear suspicious.

In practice, you should deliberately link to high-quality, thematically relevant sources — not randomly, but as an enhancement to your content. When you write an “SEO basics” article and link to the Google Search Central documentation, you signal to Google: your content is part of a larger, high-quality context. Too many outbound links to low-quality sites are viewed critically by Google. Too few or no outbound links are also not ideal. The optimum is 3–5 high-quality external links per 1,000 words of content — placed where users genuinely need more context.