What is a backlink and how to tell a good one (2026 guide)

A backlink is a link from another website to yours. Search engines read it as a reference: someone else thought your page was worth pointing to. A good backlink comes from a real site, with real readers, on a topic related to yours, and sits inside content that someone would actually read.

That is the short answer. The longer one matters, because not every link helps, and some can hurt.

Why backlinks still matter in 2026

Google has always used links to discover pages and to understand which ones other people trust. That has not changed. What has changed is where trust shows up. When ChatGPT, Perplexity or Google's AI Overviews describe a company or recommend a supplier, they lean on sources they already consider reliable: established publications, sector sites, well-linked guides.

So a backlink from a respected UK publication now does two jobs at once. It helps your page rank, and it puts your brand inside the sources that AI tools read before they answer.

The parts of a backlink

Paid links and what Google asks

Google is clear on this. If a link was paid for, it should carry `rel="sponsored"` or `rel="nofollow"`, as explained in its guidance on qualifying outbound links. Buying links that pass ranking credit without that label falls under its link spam policies.

That does not make paid placements useless. A sponsored article on a respected UK title still brings readers, brand recognition and a mention that AI tools can find. The value moves from «link juice» to visibility and trust. Treat any offer that promises «dofollow links that Google can't detect» as a warning sign.

How to tell a good backlink from a bad one

Use this checklist before you accept, earn or pay for any link.

1. Is the site real?

Look for a publication that publishes regularly, has named writers and covers more than one advertiser. A site where every article links out to a different commercial page is a link network, not a publication.

2. Does it have readers?

Metrics like Domain Authority (Moz) and Domain Rating (Ahrefs) are estimates, not Google scores. They are useful for comparing sites, but check that the site ranks for its own subject and that its traffic did not appear from nowhere in a few months.

3. Is it relevant to you?

A link from a UK fintech publication to a payments company is worth more than three links from general lifestyle blogs. Relevance is also what helps AI tools connect your brand with your category.

4. Is the link in the body of the content?

Links in the middle of a real article carry more weight than links in footers, sidebars or author boxes. They are also the ones people click.

5. Is the anchor text natural?

Your brand name, a URL or a descriptive phrase looks natural. Twenty links that all say «best accountant London» do not.

6. Would you want it if Google did not exist?

This is the test I use most. If the link would bring you readers, credibility or a quote you can show to clients, it is worth having. If its only purpose is to move a ranking, skip it.

Good and bad examples

How many backlinks do you need?

There is no fixed number. A local service business can move with a handful of relevant local and sector links. A national ecommerce brand in a competitive category needs more, and needs them steadily over time rather than all at once. Start with the page that matters most to your revenue, compare it with the pages that outrank it, and look at the kind of sites linking to them.

Where to find good backlinks

• Digital PR: data, opinions and stories that journalists want to cover. See our guide to digital PR services.
• Expert commentary: answering journalist requests in your field.
• Publishing on sector titles: choosing the outlet by audience and topic before anything else. Our media catalogue lets you filter UK and international outlets by country, metrics and price.
• Useful assets: tools, templates and guides that other sites want to reference.

If you want a broader view of how links, PR and AI visibility fit together, read our page on SEO, digital PR and GEO.

Frequently asked questions

Is buying backlinks illegal in the UK?

No. It is not a legal issue. Google asks for paid links to be labelled, and UK advertising rules require advertising to be identifiable as such. The risk is buying unlabelled links from networks built only to sell links.

Do nofollow links have any value?

Yes. They bring readers, brand mentions and signals that AI tools can read. A nofollow link in a major publication can be worth more to a business than a followed link on an unknown blog.

How long does a backlink take to have an effect?

Google has to find and process the page first. Expect weeks, not days, and judge results over 60 to 90 days rather than after a single link.

This article was written with artificial intelligence and checked by a second AI before publication. Backlinks Global editorial team.