Internal vs External Links in SEO: Differences and Best Practices
How internal and external links each help SEO, and simple rules for using both well.
Every link on your page is either internal (to another page on your own website) or external (to a different website). Both matter for SEO, but in different ways.
Internal links
Internal links connect your own pages. They:
- Help search engines discover pages and understand how they relate.
- Pass authority from strong pages (like your homepage) to deeper pages.
- Help visitors find the next useful page, keeping them on your site longer.
You control them completely, which makes them one of the easiest SEO improvements. Read internal linking strategy for small websites.
External (outbound) links
External links point readers to other websites. They:
- Support your claims with sources.
- Give readers further reading or official information.
- Show you are part of a topic's wider conversation.
Linking to a reputable source does not "leak" your rankings. A helpful page links to the information readers need, wherever it is.
Links from other sites to you
Backlinks โ external sites linking to you โ are a separate topic and among the strongest signals of trust. See how to get backlinks for a new website.
Best practices for internal links
- Link from relevant text with descriptive anchors โ see what anchor text is.
- Link new pages from older, well-linked pages.
- Avoid pages with no internal links โ read how to find orphan pages.
- Use as many links as genuinely help readers; there is no fixed limit.
The internal link suggestions tool finds natural linking opportunities in your text.
Best practices for external links
- Link to authoritative, relevant sources โ official sites, research, documentation.
- Check links still work over time.
- Use
rel="sponsored"for paid or affiliate links andrel="ugc"for links in user comments. - Use
rel="nofollow"when you do not want to vouch for a link. - Opening external links in a new tab is a design choice, not an SEO requirement.
A worked example
A personal finance blog avoided all external links, worrying they would hurt rankings. Its tax guides made claims without sources. The editor added links to official tax department pages for rates and deadlines, and internal links between related guides. Readers gained confidence, time on site rose, and the guides became easier to trust and cite.
A quick link review for any page
- Does the page link to the two or three most related pages on your site?
- Do at least a few other pages link to it?
- Are anchor texts descriptive rather than "click here"?
- Do claims and statistics link to their sources?
- Are paid or affiliate links marked sponsored?
- Do all links still work?
Running this review on your top pages once a quarter keeps your linking healthy as the site grows.
Related guides
More free tools: browse all our free SEO tools, no sign-up needed.
Frequently asked questions
Do external links help SEO?
Linking to useful sources improves content quality for readers. It does not hurt your rankings.
Is there a limit on internal links per page?
No fixed limit โ use as many as are genuinely helpful. Quality and relevance matter more than count.
Should external links be nofollow?
Only paid, affiliate, user-generated or untrusted links need nofollow, sponsored or ugc.
Do internal links need nofollow?
No. Internal links should normally be followed.