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Should you link out to other websites from your blog posts? Many writers worry that external links send readers away or leak SEO value, so they avoid them. In reality, used well, external links add credibility, improve the reader experience, and can even support your SEO. The key is knowing when and how to use them, including when to add a nofollow attribute. This practical guide explains how to use external links in blog posts effectively.
External linking, done thoughtfully, is a mark of quality content, not a leak. It complements internal linking and fits within SEO blog writing and the wider blog post writing resources.
Why Link Out at All
External links benefit your content in several ways. They add credibility by backing your claims with authoritative sources, they improve the reader experience by pointing to useful further information, and they signal to search engines that your content is well-researched and connected to the broader web. Far from hurting you, relevant external links to quality sources are a feature of trustworthy content.
The fear that external links bleed away SEO value or readers is largely overblown. Linking to credible sources where genuinely helpful enhances your content’s authority and usefulness. As Backlinko notes, citing authoritative sources is associated with quality content. Linking out is not a weakness; it is part of being a helpful, credible resource. Understanding why external links matter, credibility, experience and trust signals, frees you to use them confidently and well.
When to Use External Links
Link out when it genuinely helps the reader or supports your content. Good occasions include citing a statistic or claim, pointing to an authoritative source for further reading, referencing a study or original research, or directing readers to a useful tool or resource you mention. In each case, the external link adds value the reader would otherwise have to seek out themselves.
Avoid linking out gratuitously or to low-quality, irrelevant sites. Each external link should serve a clear purpose: backing a claim, adding credibility, or genuinely helping the reader. Linking to reputable, relevant sources at the right moments strengthens your content; random or poor-quality links do not. Knowing when to use external links, at points where they add genuine value or credibility, ensures your linking enhances rather than clutters your posts and reflects well on your content.
Link to Credible, Relevant Sources
Quality matters: link to credible, authoritative, relevant sources. Citing well-regarded publications, original research, recognised authorities or reputable tools lends your content credibility, while linking to dubious or low-quality sites can undermine it. Choose your external links carefully, ensuring each destination is trustworthy and genuinely relevant to the point it supports.
Before linking, consider whether the source is reputable and whether it genuinely supports your point. A link to a respected source strengthens your claim; a link to an unreliable one weakens it. As Google Search Central guidance implies, the company your content keeps, through its links, reflects on its quality. Linking to credible, relevant sources is what makes external linking a credibility-builder, so be selective and ensure every external link points somewhere worth the reader’s trust and attention.
Understand Nofollow and Link Attributes
Links can carry attributes that tell search engines how to treat them. A normal (followed) link passes authority to the destination, which is fine for genuine editorial links to quality sources. A nofollow link (rel=nofollow) tells search engines not to pass authority, and is appropriate for links you do not fully endorse, paid or sponsored links, or user-generated content.
For most editorial external links to reputable sources, a normal followed link is fine and natural. Use nofollow for sponsored or paid links (which Google requires you to mark), links to sources you cannot vouch for, or untrusted user-generated links. Related attributes include rel=sponsored and rel=ugc for those specific cases. Understanding nofollow and link attributes lets you link out appropriately, following best practices and Google’s guidelines while still providing valuable external links to your readers.
Open External Links in a New Tab
A practical best practice is to open external links in a new tab (using target=_blank), so readers do not lose your page when they click out. This keeps your content open while they explore the external resource, improving the reader experience and reducing the chance they leave your site entirely. It is a small detail that helps retain readers.
When opening links in a new tab, also include rel=noopener for security. This combination, opening external links in a new tab with noopener, is a common, sensible default for outbound links. It addresses the worry that external links send readers away, since your page stays open behind the new tab. Opening external links in a new tab is a simple practice that improves usability and keeps readers engaged with your content while still letting them benefit from your external references.
Keep External Links Balanced
Use external links judiciously, neither avoiding them nor overusing them. A few well-chosen, relevant external links per post, where they add value, is ideal. Too many external links can clutter your content and distract readers, while none can make your content seem less researched. Aim for a natural balance that supports your points and helps the reader without overwhelming the post.
Let each external link earn its place by adding credibility or value, and combine them with strong internal links and good on-page SEO. This balanced approach uses external links as one element of well-rounded, credible content. Keeping your external links balanced and purposeful ensures they enhance your posts, building trust and serving readers, without detracting from your content or sending readers away unnecessarily. Used this way, external links are a genuine asset to your blog.
How to Choose Trustworthy Sources
Because the sources you link to reflect on your own credibility, it is worth having a simple way to judge them. Prefer primary sources over second-hand summaries: link to the original study, the official documentation, or the organisation that actually produced the data rather than a blog that merely reported on it. Look for sources with genuine authority in their field, recognised publications, academic or government bodies, established industry leaders, and check that the information is current rather than years out of date. A quick glance at who is behind a source, and whether they have a reason to be reliable, usually tells you what you need to know.
Be especially careful when citing statistics, since stats travel around the web losing accuracy as they go. Trace a figure back to its origin before you cite it, both to confirm it is real and to link readers to the authoritative version. Avoid linking to direct competitors for commercial terms, and steer clear of sites that look spammy, are riddled with ads, or make claims with no evidence. Building a small mental shortlist of go-to authoritative sources in your niche makes this faster over time. Choosing trustworthy sources deliberately ensures your external links strengthen your credibility rather than quietly undermining it, which is the whole point of citing them.
Maintain Your External Links Over Time
External links have a particular weakness that internal links do not: you do not control the destination, so they can break, change or degrade without warning. Pages get moved or deleted, leaving broken links that frustrate readers and signal neglect, and sometimes a once-reputable site changes hands or declines in quality, so a link you were proud of now points somewhere you would not endorse. Because of this, external links benefit from occasional review, especially on your most important and most-trafficked posts.
A periodic check for broken outbound links, using a free link-checking tool, lets you repair or remove dead links before they accumulate. When you find a broken link, look for the content at its new location or a comparable authoritative source, and update accordingly rather than simply deleting the citation, since the point it supported still needs backing. It is also worth refreshing external references when you update a post, swapping in newer studies or more current sources keeps your content accurate and authoritative. Treating external links as something to maintain, not just add and forget, protects both the reader experience and the credibility that good external linking is meant to provide.
How Content That Sales Can Help
Thoughtful external linking, with correct attributes, is part of how we produce credible, well-researched content. Our team writes blog posts that cite authoritative sources appropriately, apply nofollow where needed, and balance external and internal links for maximum value. Explore our blog post writing service to see how we craft trustworthy, SEO-friendly content that links smartly to serve both readers and search.
Frequently Asked Questions
Are external links good or bad for SEO? Used well, they are good. Relevant external links to credible sources add credibility, improve the reader experience, and signal well-researched content. The fear that they leak SEO value or send readers away is largely overblown.
When should I add a nofollow attribute? Use rel=nofollow for sponsored or paid links (which Google requires you to mark), links to sources you cannot fully vouch for, and untrusted user-generated content. Most editorial links to reputable sources can be normal followed links.
Should external links open in a new tab? It is a sensible default. Opening external links in a new tab (with rel=noopener for security) keeps your page open while readers explore the external resource, improving usability and reducing the chance they leave your site.
How many external links should a post have? A few well-chosen, relevant links where they add value is ideal. Too many clutter the content and distract readers; none can make your content seem less researched. Aim for a natural, purposeful balance.