SEO Linkbuilding: What it is and how to do it right in 2026

If you've been reading about SEO for a while, you've heard that "content is king." It is true, but incomplete. A website with excellent content that no one links to is unlikely to appear in the top positions of Google.

That's where link building comes in: the art – and technique – of getting other quality websites to point to yours. It is one of the most important positioning factors and also one of the most misunderstood.

In this article we explain what exactly it is, how it works, what types of links exist and how to build a strategy that delivers results without risking penalties.
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 What Link Building Is (and What It Isn't)

Link building is the process of getting external links — also called backlinks — that point from other websites to yours. Each link acts, from Google's perspective, as a vote of confidence: someone considers your content relevant and useful, and recommends it.

 But not all votes weigh equally. A link from a leading media outlet in your industry is worth much more than ten links from generic directories or blogs with no traffic.

 What link building is not: buying packages of 500 links for 20 euros, massively exchanging links with websites unrelated to your sector, or publishing content on artificial blog networks. These practices existed and worked years ago. Today, Google detects and penalizes them effectively.

 Why Google still values links so much

Google's algorithm has evolved enormously, but the weight of external links has not fallen – quite the contrary. The reason is simple: a link is difficult to spoof at scale when it comes from a site with real authority.

 Google uses links to understand two things:

• Domain Authority: How many trustworthy sites talk about you and recommend you.
• Thematic relevance: if the sites that link to you are related to your sector, they confirm that you are a benchmark in that area.

In addition, with the emergence of generative AI in search engines (Google AI Overviews, ChatGPT with search, Perplexity...), link building also plays a role in GEO (Generative Engine Optimization): AIs tend to cite and recommend websites that already have authority and a proven online presence.

Types of links you should know

Not all backlinks have the same impact or risk. These are the main ones:

Editorial links (the most valuable)

They are the ones you get naturally because your content or your product deserves to be cited. A hospitality blog that links to your article on booking management, or a digital media that names you as a reference in your sector. They are the most difficult to get and the ones that weigh the most on Google.

Guest posts

You write a valuable article for another website in your sector and, within the content, you include a link to yours. Done well—with genuine content, on relevant websites—is one of the most effective tactics. Poorly done – filler texts on spam websites – is a penalty waiting to happen.

 Press releases and media appearances

When your company has real news to tell —launches, industry data, expansion, success stories— distributing it in digital media generates mentions and links on portals with high authority.

Directories and sector listings

 Appearing in reference directories in your industry (not generic bulk paid directories) brings signals of trust and moderate-quality but legitimate links.

Link from partner and collaborator websites

If you work with suppliers, distributors or partners who have reputable websites, a mutual mention can be completely natural and beneficial for both parties.

 How to Evaluate Link Quality

Before investing time or money in getting a link, it is advisable to assess these factors:

• Domain authority: Does the website linking to you have real traffic, age, and good reputation?
• Thematic affinity: Does it make sense for that website to talk about you? A travel portal that links to an SEO agency generates less signal than a digital marketing portal.
• Link context: Does it appear within relevant text or is it in a generic footer or sidebar?
• Link attribute: Dofollow links convey authority. Nofollow or sponsored do not transmit it directly, but they also provide visibility and profile diversity.

Link building mistakes that damage your rankings

More than one company has suffered a crash on Google after hiring a cheap link building service. These are the most frequent mistakes:

• Buy links from private blog networks (PBNs): Google detects them better every year and the penalties are severe.
• Force anchor text with the exact keyword: If 90% of your links use exactly "SEO agency Barcelona", it seems artificial. Diversity is the sign of naturalness.
• Getting a lot of links at once: A link profile that grows from 10 to 500 in a month raises red flags. Growth must be progressive.
• Ignore thematic relevance: Ten links from cooking websites are not going to position you as an SEM agency, no matter how much authority those domains have.

 How to Build an Effective Link Building Strategy

 A good link building strategy is not improvised. These are the steps we follow at Semseo with our clients:

1. Auditing the Current Link Profile

Before you start building, it's a good idea to know where you're starting from: how many backlinks you have, what quality they are, if there's any toxic ones that should be disavowed.

1. Competitor analysis

Where do your main competitors get their best links from? Those same media and portals are natural candidates for you.

1. Definition of objectives and budget

Link building is a medium-long term investment. Defining how much you can allocate each month and which pages you want to boost makes the difference between dispersing your budget and concentrating it where it matters.

1. Creating Linkable Content

The best backlinks are achieved when you have something worth linking to: guides, case studies, industry data, free tools, infographics. Content is the magnet for natural links.

1. Outreach and media relations

Contacting media and blogs in the sector in a personalized way, with real value propositions, is the lever to get the most valuable links.

 Frequently asked questions about link building

How many links do I need to rank?

There is no magic number. What matters is the quality and thematic affinity of the domains that link to you. Ten links from relevant media are worth more than a hundred generic directories.

How long does it take for link building to yield results?

 The effects of link building on positioning begin to be noticed between 2 and 6 months after getting the links. It is a strategy of substance, not of immediate results.

Can I do link building myself?+

Yes, especially if you have relationships in your industry or the ability to create quality content that others want to link to. However, scaling a link building strategy consistently often requires expertise, tools, and time that few companies have in-house.

Is link building the same as mentions without a link?

Not exactly. Unlinked mentions also have some value for Google, especially in the context of GEO and the perception of brand authority. But a dofollow link in a relevant context is still superior in terms of direct impact on positioning.

What happens if I am linked to low-quality websites without my request?

It happens with some frequency, especially in places with some authority. You can use Google Search Console's Disavow tool to tell Google not to consider those backlinks.

Is link building also useful for local SEO?

Yes. For local businesses, getting links from media and directories in the city or region where you operate greatly reinforces the local relevance signals that Google needs to show you in geolocated results.

How do I know if a link I'm offered is quality or spam?

Analyze the domain before accepting or paying: check its estimated organic traffic, penalty history, site theme, and whether the content is genuine or auto-generated. Tools like Ahrefs, Semrush, or Sistrix give you a pretty clear picture.

Conclusion

Link building isn't an old-school tactic or something that has lost its currency with Google's latest updates. It remains one of the three pillars of SEO alongside technical SEO and content, and will remain so as long as the algorithm is based on signals of authority and trust between domains.

What has changed is how to do it well: less quantity, more quality. Less automation, more strategy. Fewer shortcuts, more real relationships with relevant websites in your sector.

If you want to know how your current link profile is doing and what opportunities you have to improve it, at Semseo we can help you. Tell us about your project and we will analyse it without obligation.

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