Is Link Building Still Relevant to SEO in 2025?

Most SEO debates swing between two extreme positions: link building is either the single most powerful ranking lever available, or it is a relic of a more manipulable internet that Google has been quietly deprecating for years. Neither position is accurate. The reality sits somewhere more nuanced — and more useful.

So, is link building still relevant to SEO in 2025? The short answer is yes, but the type of link building that matters has shifted considerably. What worked in 2015, or even the version of the practice that dominated conversation in 2019, is not what earns authority now. Understanding the distinction is the difference between an SEO budget well spent and one that actively introduces risk.

If you're looking for expert help in this area, explore how Indexed's link building services can drive measurable results for your business.

Why Links Still Matter to Google

Google's core algorithm has used links as a proxy for trust and authority since PageRank was first published in 1998. The logic has always been straightforward: if a credible, independent source chooses to reference your content, that reference carries implicit editorial endorsement.

What has changed is Google's ability to assess the quality of that endorsement. Early iterations of the algorithm treated all links roughly equally; modern systems can distinguish between a link from a nationally recognised news outlet and one from a domain created last month with no traffic, no audience, and no topical relevance. The signal itself has not gone away — the noise around it has simply become easier to filter.

What Google Has Actually Said

Google's public guidance on links has shifted in tone over the past few years. In 2023, Google updated its documentation on how Search works to describe links as one of several signals used to assess relevance and authority — not the primary signal it was once framed as. Google's Search Relations team has also stated that the weight given to links has been reduced over time as other quality signals have improved.

This does not mean links are irrelevant. It means low-quality links contribute progressively less — and high-quality links from editorially independent, topically relevant sources remain a strong signal that is difficult to replicate through other means.

What Has Actually Changed Since the Link Building Debates of 2019

The link building conversation of 2019 was dominated by guest post volume, domain authority as a headline metric, and the proliferation of link brokers operating in plain sight. That era produced two predictable outcomes: a short-term rankings boost for sites willing to pay for links at scale, and a series of manual and algorithmic penalties that wiped out significant organic visibility for sites caught doing so.

Helpful Content Updates and Their Effect on Link Value

Google's Helpful Content updates, rolled out and refined from 2022 onwards, changed how content quality is assessed. Sites producing thin content at scale — often the same sites that published paid links in bulk — saw significant ranking volatility. This matters for link building because it affects the value of the source, not just the destination.

A link from a site that has been hammered by a Helpful Content update carries far less authority than it did before that update. Any link acquisition strategy that relies on a fixed list of publications without monitoring those publications' own search performance is operating on outdated assumptions.

How AI-Assisted Evaluation Has Raised the Bar

Google's application of machine learning to link evaluation means the patterns that once allowed low-quality link networks to pass undetected are now much more visible at scale. Anchor text that is too consistent, link velocity that spikes without a corresponding content event, links appearing on sites with no organic traffic — these patterns are easier to identify algorithmically than they were manually.

The practical effect is that link building volume as a strategy has become riskier, while link building quality as a strategy has become more defensible.

What Actually Makes a Link Valuable in 2025

The metrics that dominated link evaluation for a decade — domain authority (DA), domain rating (DR) — are third-party proxies, not Google signals. They are useful as rough filters, but they have never been what Google measures. Two links with an identical DR can have drastically different impact depending on factors those scores do not capture.

Topical Relevance Over Raw Authority

A link from a mid-sized trade publication that covers your specific sector in depth is worth considerably more to a specialist business than a link from a high-DR lifestyle aggregator with no topical overlap. Google's systems are increasingly effective at understanding what a site is about at a granular level, and links that make thematic sense carry more weight than those that simply come from a large domain.

Editorial Independence as a Trust Signal

The distinction between a link that was placed because a journalist or editor chose to reference your content, and a link that was paid for or exchanged, is something Google has invested heavily in detecting. Google's spam policies explicitly classify paid link schemes as a violation. This does not mean all commercial link acquisition is off the table — but it does mean the execution needs to produce links that would withstand editorial scrutiny.

The Case That Competitors Rarely Make: Links Compound

Most discussions about link building treat it as a transactional activity — you acquire a link, it influences a ranking, job done. This framing misses the more significant commercial argument for building a strong backlink profile over time.

Authority compounds. A site that earns high-quality links consistently over two or three years builds a profile that is genuinely difficult for a new entrant to replicate quickly, regardless of budget. This is not primarily because of ranking positions — it is because referral traffic, brand mentions, and citation patterns that develop alongside a strong link profile create multiple reinforcing signals that a sudden spike of purchased links cannot produce.

Consider a UK professional services firm that has spent three years contributing expert commentary to industry publications, earning citations in trade press, and being referenced in research roundups. Their backlink profile reflects a real-world reputation. A competitor that tries to close that gap in six months through volume-based link acquisition is not acquiring the same asset — they are acquiring a superficially similar metric that behaves very differently under algorithmic scrutiny.

Links as a Trust Signal in AI-Generated Results

As AI Overviews and generative search surfaces become more prominent, the question of which sources AI systems treat as authoritative is increasingly relevant. The evidence so far suggests that sites with strong backlink profiles from editorially independent sources are more likely to be cited in AI-generated answers. This is consistent with how these systems are trained — they draw on content that is itself well-referenced and trusted by other sources.

Link building, done correctly, contributes to the kind of authority profile that makes a brand more citable — not just in traditional search results, but in the AI surfaces that are increasingly intercepting search journeys. For a deeper look at how AI systems evaluate and cite sources, see our article on how AI search engines decide what to cite.

What to Stop Doing: The Practices That Now Introduce More Risk Than Reward

The honest answer to "is link building still relevant to SEO?" includes a clear-eyed look at which version of link building is being discussed. Several practices that were mainstream five years ago now sit in territory where the risk-to-reward ratio has inverted.

• Guest posting purely for links: Large-scale guest posting campaigns targeting sites with no genuine audience, where the primary goal is the link rather than the readership, remain explicitly against Google's guidelines. The scale at which this was done has made the pattern easy to identify algorithmically.
• Link exchanges and private blog networks: Reciprocal linking arrangements and PBNs produce metrics that look like links but behave differently under scrutiny. The short-term ranking lift they occasionally produce tends to be fragile.
• Anchor text over-optimisation: A backlink profile where a high proportion of external links use exact-match commercial anchor text is a pattern associated with manipulation, not natural editorial reference. Natural profiles show significant variation.
• Chasing DA/DR targets without traffic validation: A link from a site with DR 60 and no organic traffic of its own is not the same asset as a link from a DR 60 site with a genuine audience. Validate source sites against organic traffic data, not just a third-party score.

FAQ

Is link building still relevant to SEO, or has content replaced it?

Content and links are not substitutes for each other — they are complementary. High-quality content is what earns editorial links from credible sources. Strong links are what signal to Google that the content is worth surfacing. Sites that invest in content without any link acquisition tend to rank below sites with comparable content and a stronger backlink profile, particularly in competitive sectors.

How many links does a page need to rank?

There is no fixed number. The relevant benchmark is the competitive gap — how does your page's authority profile compare to the pages currently ranking for the same query? In low-competition niches, strong on-page signals alone may be sufficient. In competitive sectors, the pages at the top of the results typically have significantly more referring domains than those below them.

Does Google still penalise sites for bad backlinks?

Google continues to apply manual actions for clear violations of its spam policies, including paid link schemes. Algorithmically, the position has shifted: rather than penalising sites for low-quality links, Google increasingly simply discounts those links — meaning the investment is wasted rather than actively harmful in most cases. The disavow tool remains available for sites that have received manual actions.

Is digital PR the same as link building?

Digital PR is one method of earning links — specifically, links from news and media publications through editorial coverage. It is not a synonym for link building as a whole, which encompasses a broader range of tactics including resource link building, expert contributions, data-led outreach, and relationship-based placement. Digital PR tends to produce the highest-authority links but requires a sustained content and outreach operation to generate links consistently.

What to Do This Week

If you are reassessing your link building activity, here are the specific decisions worth making now rather than adding to a strategic backlog:

• Audit your current backlink profile. Pull your referring domains in Ahrefs or Semrush and filter for sites with organic traffic below 500 visits per month. Links from sites with no real audience should be deprioritised or disavowed if they reflect a pattern of paid acquisition.
• Identify your competitive authority gap. For your three most commercially important target pages, compare your referring domain count to the top three ranking pages. That gap is your baseline — any link strategy without a number to close against is not a strategy.
• Choose one editorial outreach angle. Original data, expert commentary on a recent industry development, or a well-cited guide in your sector are all repeatable formats that earn links naturally. Pick one and brief it as a content piece with outreach built in from the start, not added as an afterthought.
• Define what a qualifying link source looks like for your business. Before any outreach, establish minimum thresholds: topical relevance, organic traffic floor, editorial independence. A written brief on link source criteria prevents inconsistent acquisition and keeps quality standards explicit.

Related Reading

• Paid vs Editorial Backlinks: What Builds Authority
• What Makes a High-Quality Backlink? (And What to Avoid)
• How AI Search Engines Decide What to Cite
• Entity SEO: How to Build Knowledge Graph Authority
• Is SEO Dead or Evolving in 2026?