What is link building?
Link building is the work of getting other websites to link to yours. It works because search engines read links as a sign of trust and as a description of the page. The methods range from free requests to paid placements that break Google's policy.
In short
- Link building is proactive work to obtain links from other sites, and link earning is the name for links given with no request.
- Google's spam policies, last updated in August 2026, define link spam as links created primarily to manipulate rankings, and allow paid links only with a sponsored or nofollow attribute.
- Every method follows the same five steps, which are to find a site, give it a reason to link, get the link placed, check it and record it.
- BuzzStream's 2026 data puts a paid guest post at $295 on average bought direct and a niche edit at $179, while reclaiming your own lost links costs little more than time.
- Ahrefs' January 2025 study of one million keywords found a correlation of 0.255 between referring domains and rankings, slightly lower than in 2019.
Link building is the work of getting other websites to link to yours. It is the largest part of off-page SEO, and it exists because search engines treat a link as evidence: another site was willing to send its readers to you.
The term covers very different activities. Emailing a supplier to ask for a place on its partners page is link building. So is running a press campaign, and so is paying a blog to publish an article with your link in it. What they share is intent: you set out to get the link.
Why links are worth building
A link from another site does two jobs in Google. A Google engineer interview, published as an exhibit in the US antitrust case and reported in May 2025, describes PageRank as “a single signal relating to distance from a known good source” that feeds a quality score for the site. The same exhibit lists anchors, the clickable words of links, as one of three core relevance signals. So a link can raise trust in your site and tell Google what the linked page is about.
Links also bring readers directly, and coverage on other sites puts your name in front of people and AI assistants whether or not it carries a link.
Building and earning
The industry separates two ideas.
- Link building is proactive: outreach, guest articles, digital PR, broken link replacement, partnerships and paid placements.
- Link earning is passive: someone cites your data, tool or news because it deserved a citation, and nobody asked.
The line is thinner than it sounds. Most “earned” links follow deliberate promotion, because a study nobody hears about earns nothing. Two questions are more useful. Did the linking site make its own editorial decision? And if money changed hands, is that disclosed?
How link building works
Every method follows the same five steps.
- Find sites that could link. These are sites that cover your topic, already link to competitors, or already mention you. Comparing your links with those of competitors is the standard way to build the list.
- Give them a reason. The reason may be a useful page, a quote from an expert, a correction to a dead link, an existing business relationship or a fee.
- Get the link placed. That means an email, a pitch or an order, followed by the site publishing or editing a page.
- Check it. The link is on the live page, it points to the right URL, and the page can be indexed.
- Record and monitor it. Links get removed and pages get deleted, so tracking your backlinks is part of the job.
What differs between methods is step 2. That step decides the cost, the speed and the risk.
The main methods
The table groups the common methods by the reason the other site links. Costs marked as working estimates come from practitioner experience, not from a published dataset.
| Method | Why the site links | Typical cost per link | Risk under Google’s policy |
|---|---|---|---|
| Link reclamation | It already linked and the link broke | Close to nothing. Working estimate | None |
| Partner, supplier and testimonial links | You already do business together | Free. Working estimate | None |
| Linkable assets with outreach | Your page is worth citing | $150 to $400. Working estimate | None |
| Digital PR | You gave a journalist a story | $300 to $1,500. Working estimate | None |
| Guest posting | You wrote something its readers want | $150 to $600 in labour. Working estimate | Low, rising with scale |
| Link exchanges | You linked to it | Free to low. Working estimate | Moderate. “Excessive” exchanges are named in the policy |
| Paid guest posts | You paid | $295 direct, $461 through a vendor, per BuzzStream’s June 2026 data | Breaks the policy unless labelled |
| Niche edits | You paid for a link in an old article | $179 on average, per BuzzStream’s August 2026 data | Breaks the policy unless labelled |
| Private networks and automated links | The seller controls the site | Very low | High. Explicit violation |
The tactics chart covers each one in full.
What Google allows
Google’s spam policies, last updated in August 2026, define link spam as “the practice of creating links to or from a site primarily for the purpose of manipulating search rankings”. The listed examples include buying or selling links for ranking purposes, excessive link exchanges, automated link creation, low-quality directory links and widely distributed footer links.
The same page says buying and selling links is “a normal part of the economy of the web” for advertising, and is not a violation when the link carries rel="sponsored" or rel="nofollow".
So the policy does not ban link building. It bans links that exist only to move rankings and that hide what they are. Asking a real partner for a link or pitching a story to a reporter sits well inside it. An unlabelled paid link does not, which is why the industry sorts tactics into white, grey and black hat.
In practice, Google mostly ignores links it judges to be spam instead of punishing the site. The common cost of a bad link is the money spent on it.
Does it still work?
Yes, with less force than it once had. Ahrefs’ study of one million US keywords, published in January 2025, found a correlation of 0.255 between referring domains and rankings. Comparable keywords scored 0.27 in 2019. Google’s Gary Illyes said in September 2023 that links are important but that people overestimate them. A correlation is not proof of cause, because pages that rank also attract links.
Two things have changed around link building. Quality matters far more than count, and brand mentions now carry value for AI answers. Do backlinks still matter goes through the studies.
Who does the work
There are three routes: do it in-house, hire an agency, or buy placements through a platform. Agencies and productised services sell the labour as well as the link. Marketplaces sell access to publishers and leave the judgement to you. Our comparison of link building services lists the main vendors by category.
Whichever route you choose, the test of a link is the same. Is the page indexed, is the site read by real people, and would the link make sense if search engines did not exist?
Where to go next
If you are starting from zero, your first 100 links puts the cheapest tactics in order. Unfamiliar terms are in the glossary.
Common questions
What is link building in simple terms?
It is the work of getting other websites to add a link to your site. You do it by asking, by publishing something worth linking to, by pitching journalists or by paying for a placement.
Is link building against Google's rules?
Not in itself. Google's policy targets links made primarily to manipulate rankings, such as bought links that pass ranking credit, excessive exchanges and automated links. Links a site chooses to give are what Google wants to count.
Does link building still work?
Yes, with less force than a decade ago. Ahrefs' January 2025 study found referring domains still correlate with rankings at 0.255, and Google's own ranking systems guide still lists link analysis and PageRank.
What is the difference between link building and link earning?
Link building means you went out to get the link. Link earning means someone linked without being asked. In practice most earned links follow deliberate promotion, so the two overlap.
How long does link building take to show results?
Usually weeks to months. The link has to be placed, crawled and indexed before it can count, and the first link from most tactics takes between a few days and three months to arrive.
