Link building
Link building is the process of acquiring external hyperlinks from other websites to improve domain authority and search engine rankings.
Link building is an SEO discipline encompassing methods of acquiring external links: content marketing, outreach, guest posting, digital PR, and other link profile growth techniques.
What is link building
Link building is the systematic process of acquiring external hyperlinks pointing to your website's pages. External links are one of Google's three core ranking factors, alongside content and technical SEO.
The goal of link building is not simply link volume, but an authoritative, topically relevant link profile that signals to search engines: this site is trustworthy and an expert in its niche.
Why links matter for SEO
A link is a vote of trust from one site to another. The more authoritative sites link to a page, the higher its PageRank and the higher its rankings for competitive queries. Without a link profile, even perfectly optimised content rarely reaches the top 3.
Ranking factor
Links are in Google's top-3 ranking factors according to the company itself
Pages without traffic
According to Ahrefs research, 91% of pages get no organic traffic — most have no links
Traffic difference
Pages with external links receive on average 3.8× more traffic
Typical 1-year growth
Systematic link building in a niche project typically yields a DR increase of 30–50 points in 12 months
White-hat link building methods
- Content marketing
- Creating valuable content (research, infographics, calculators) that attracts links organically. The most long-term and safest method.
- Guest posting
- Writing articles for authoritative publications with a mention of your site. The content must be genuinely valuable, not created 'just for the link'.
- Broken link building
- Finding broken links on third-party sites and offering your page as a replacement. Effective when you have relevant content.
- Digital PR
- Media coverage through press releases, expert commentary, and exclusive data. Delivers links from high-authority domains.
- Resource page link building
- Finding niche resource pages and suggesting your content be added. Works when your content genuinely helps their audience.
- HARO / Expert media quotes
- Responding to journalist requests via Help A Reporter Out (HARO). A fast way to earn links from media outlets.
Grey and black-hat methods
Some link building methods violate Google's guidelines and carry penalty risk. Understanding them matters — both for assessing your own risks and protecting against negative SEO.
| Method | Risk | Why people use it |
|---|---|---|
| Buying links on exchanges | High | Fast results at low cost |
| PBN (private blog networks) | Very high | Full control over links |
| Link exchanges A↔B | Medium | Low cost, fast agreement |
| Crowd marketing (comments) | Low–medium | Cheap, creates appearance of mentions |
| Guest posts at scale | Medium | Anchor control, niche relevance |
Outreach: how to earn links
Outreach is the process of personally contacting website owners with a proposal to add a link. Effective outreach is built not on mass templates but on genuine value for the recipient.
- Find potential donors by niche and authority (Ahrefs, Semrush, Google search)
- Research each site: content, audience, contact information
- Write a personalized email — explain why your page benefits their readers
- Suggest a specific context for placing the link
- Follow up after 5–7 days if there's no response
- Track results and scale what works
Link quality metrics
- DR (Domain Rating)
- Ahrefs metric — domain authority on a 0–100 scale. Prioritise donors with DR 40+.
- DA (Domain Authority)
- Moz metric — similar to DR, 0–100 scale. Not to be confused with Google's algorithm.
- Donor traffic
- A site with real organic traffic is more valuable than one with a formally high DR but no visitors.
- Topical relevance
- A link from a topically relevant resource passes more valuable topical authority.
- Link position
- Links in the main page content (editorial) are more valuable than links in sidebars and footers.
Common questions
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