External Links SEO
An external link is a hyperlink on your page that points to a page on a different domain, also called an outbound link when it leaves your site.
Start here
- Only link when it genuinely helps the reader.
- Use descriptive anchor text, not "click here."
- Check the destination for relevance and trustworthiness.
- Apply nofollow, sponsored, or UGC attributes as needed.
- Don't obsess over link count — focus on quality.
What I'd do first
- Link only when it helps the reader. If the link doesn't add context or support a claim, skip it.
- Use descriptive anchor text. Instead of "click here," write something like "Google's guide to structured data."
- Check the destination. Make sure the page is relevant, trustworthy, and not spammy.
- Apply the right attribute. Use
rel="nofollow"for untrusted content,rel="sponsored"for paid links, andrel="ugc"for user-generated content.
Plain-English take
Think of external links like citations in a research paper. You're saying, "Hey, this other source backs up what I'm saying." They're not a ranking hack — Google doesn't reward you for just having a bunch of outbound links. But they do signal that you've done your homework and care about your reader's experience. A well-placed link to a trusted resource can make your content more useful and credible.
When it actually matters
- Supporting a claim. If you say "Studies show X," link to the study.
- Guiding readers to deeper resources. A link to a comprehensive guide can save you from writing a novel.
- Building topical credibility. Linking to authoritative sources in your niche signals you know the landscape.
- Avoiding thin content. If your page is short, a few high-quality external links can add value without padding.
What I got wrong
- Adding links just to have them. I used to think more links = better SEO. Nope. Irrelevant links just annoy readers.
- Linking to low-quality sites. A link to a spammy page can hurt your credibility. Vet the destination.
- Using vague anchor text. "Click here" tells no one anything. Be specific.
- Forgetting link attributes. I once linked to a sponsored post without
rel="sponsored". That's a no-no per Google's guidelines.
Next step
Quick answers
Do external links help SEO?
External links can improve SEO indirectly by enhancing user experience and topical credibility, but they are not a direct ranking factor.
What is the difference between an external link and a backlink?
An external link goes from your site to another site. A backlink is a link from another site to yours.
Should I use nofollow on all external links?
No, only use nofollow when linking to untrusted or paid content. For relevant, high-quality sources, dofollow is fine.
How many external links should a page have?
There is no fixed number. Focus on relevance and usefulness rather than quantity.
Sources
Primary documentation is linked directly. Anything commercial is marked nofollow.
- Google Search Central — Primary source for Google's link and quality guidance, including link attributes and best practices.
- Moz Learn SEO — Clear definition of external links and practical SEO explanation.
- Search Engine Land — Widely cited SEO reference covering external-link basics and usage.
- Ahrefs SEO Glossary — Concise industry definition contrasting external and internal links.
Notes from Callum Bennett.