Link building works without buying links when you give other sites a reason to link: original data, useful tools, a fix for a broken link or a correction to an unlinked mention. Link building is the work of getting other websites to link to your pages, and Google still uses those links to judge relevance and find new pages.
Link building is one part of SEO, next to technical health and content. A backlink is a link on another site that points to a page on your site. The working rule in this guide is simple: earn the link, or tag it. Any link you pay for, in money, goods or services, carries rel="sponsored", and everything else has to be worth linking to on its own merits.
How does link building help SEO, and does Google still use links?
Link building helps SEO because Google uses links in two ways: as a signal of what a page is about and how relevant it is, and as the main route to discover new pages. Google confirms both in its documentation, and it also says links are one signal among many, not the whole ranking system.
Google's SEO link best practices (updated December 2025) state that "Google uses links as a signal when determining the relevancy of pages and to find new pages to crawl." The ranking systems guide lists link analysis systems and PageRank as part of the core ranking systems, and adds that how PageRank works "has evolved a lot" since launch.
Google also puts links in context. PageRank is one of many ranking signals, according to Google's SEO Starter Guide, which also says Google "primarily finds pages through links from other pages it already crawled." That discovery role is why new pages without links often stall in Google indexing.
Links also matter for AI search. Google's AI features documentation says a page must be indexed and eligible to show with a snippet to appear as a supporting link, which is where the work in GEO vs SEO overlaps.
Which link building techniques earn links without paying for them?
Five link building techniques earn editorial links without paying for the link: digital PR, linkable assets, broken link building, resource page outreach and reclaiming unlinked brand mentions. Each one gives the linking site something of value for its own readers, which is the difference between an earned link and a bought one.
- Digital PR is pitching journalists a story, such as original research, that earns coverage with a link.
- A linkable asset is a page built to be cited, such as a free tool or a study.
- Broken link building is offering your page as a replacement for a dead link.
- Resource page outreach is asking curators of link lists to add a fitting page.
- Unlinked mention reclamation is asking sites that name your brand to add the link.
| Technique | What you need first | Effort per link | Main risk |
|---|---|---|---|
| Digital PR | Original data | High per story | Coverage without a link |
| Linkable assets | A tool, study or template | High upfront, then low | Ignored without promotion |
| Broken link building | A page matching the dead topic | Medium | Low reply rates |
| Resource page outreach | A page that fits the list | Low to medium | Stale lists |
| Unlinked mentions | Existing brand coverage | Low | Needs existing mentions |
Content marketing for link building is the base of all five; the Google AI content guidelines set the quality bar.
How do you do broken link building, step by step?
Broken link building means finding a dead outbound link on a relevant page, checking what the missing page used to say, and offering a page of yours that covers the same topic as a working replacement. It works because it fixes a real problem for the linking site, so the request is a favor, not an ask.
- Pick a topic you already cover well. Start from a complete, current and indexed page.
- Find pages that link out on that topic. Crawl guides and resource lists in your niche for dead outbound links.
- Confirm the link is dead. A not found error or an expired domain counts; a working redirect does not.
- Check what the dead page said. Open it in the Wayback Machine and confirm your page serves the same need.
- Close any gap in your page. The editor only swaps the link if your page fits as well as the original did.
- Email the editor with the exact location. Name the page, the dead URL and your replacement in three sentences.
- Follow up once, then log it. Record the page, contact, date and outcome.
Never offer money or a link swap in return: either one turns the request into link spam.
Where does a link building strategy cross Google's spam policies?
A link building strategy crosses Google's spam policies when links are created primarily to manipulate search rankings. Google calls that link spam, and it includes buying links that pass ranking credit, excessive link exchanges, automated link creation and keyword-rich anchors in guest posts or press releases distributed on other sites.
Google's spam policies (last updated August 2026) also name low-quality directory links, widely distributed footer links and forum comments with optimized links. The same page says buying links for advertising "is a normal part of the economy of the web" as long as the links are qualified with rel="nofollow" or rel="sponsored".
Google enforces this with algorithms and people. The December 2022 link spam update used SpamBrain, Google's AI-based spam prevention system, to detect sites buying links and sites selling them, and the credit those links passed was lost. A manual action is a penalty a human reviewer at Google applies when pages break the spam policies.
The earned link test is a three question decision rule for any single link:
- Was anything of value exchanged? If yes, tag it
rel="sponsored"or skip it. - Would the link exist without search engines? If no, skip it.
- Would the linking page's readers click it? If no, skip it, even when free.
A link that passes all three needs no rel value.
Which rel attribute should a link carry: sponsored, ugc or nofollow?
A link carries rel="sponsored" when it is an ad, a paid placement or an affiliate link, rel="ugc" when it sits in comments or forum posts, and rel="nofollow" when neither applies but you do not want to vouch for the target. A normal editorial link needs no rel value at all.
Google introduced sponsored and ugc in its September 2019 nofollow announcement, 14 years after nofollow arrived in 2005. Since then all three are "treated as hints about which links to consider or exclude within Search," rather than strict commands. The current guide to qualifying outbound links (updated December 2025) says nofollow is "still an acceptable way" to flag paid links, though sponsored is preferred, and that values can be combined, as in rel="ugc nofollow".
The rule cuts both ways for a link building program. In its July 2021 post on qualifying links, Google asked sites to tag affiliate links with rel="sponsored" and warned that sites publishing or acquiring links through excessive sponsored and guest posting without proper tags may face "algorithmic and manual actions." Duy Nguyen, Search Quality Analyst at Google, closed that post with: "Focusing on producing high quality content and improving user experience always wins out compared to manipulating links."
How do you evaluate a link building program or vendor?
Evaluate a link building program or vendor by asking where the links will come from, what the vendor exchanges for them and how each link would hold up against Google's spam policies. A vendor that guarantees metrics, sells from a fixed list of sites or hides placements is selling ranking credit, which is the definition of link spam.
Domain Rating (DR) is Ahrefs' score of a site's backlink profile, and Domain Authority (DA) is Moz's equivalent. Neither is a Google metric.
| What to check | Red flag | What a safe program does |
|---|---|---|
| Promised outcome | A guaranteed count of high DR links | Promises pitches and assets, not links |
| Link source | Fixed site menu with a price per placement | Pitches sites that fit each story |
| Payment to sites | Fee or free product per published link | Pays for its own work, never the link |
| rel values | "Dofollow guaranteed" on sponsored posts | Paid placements carry rel="sponsored" |
| Anchor text | Exact match anchors on request | Editors choose natural anchors |
| Transparency | Will not name sites before you pay | Reports every target and live link |
Run the earned link test on three sample links from the vendor's past work before you sign. One failed sample means the program relies on links Google says it neutralizes.
Common mistakes with link building
The common mistakes with link building are buying links that pass ranking credit, chasing third party metrics instead of relevant sites, and running outreach before there is a page worth linking to. Each mistake either adds risk under Google's spam policies or wastes outreach effort, and each has a direct fix.
- Paying for "dofollow" guest posts. Google lists paid links that pass ranking credit as link spam. Tag paid placements with
rel="sponsored"or skip them. - Judging links by DR or DA alone. These are vendor scores, not Google signals. Judge a link by the relevance and audience of the linking page.
- Using exact match anchors everywhere. Google's spam policies name optimized anchor text in guest posts and press releases. Let editors use your brand name or a natural description.
- Disavowing links out of fear. The disavow tool help page says most sites will not need it and that incorrect use can harm performance. Use it only for spammy links tied to a real or likely manual action.
- Reading the Links report as a full list. The Links report shows a sample, caps tables at 1,000 rows (as of October 2026) and does not show whether a link is nofollow. Spot check linking pages by hand.
