Backlinks are links that lead from one website to another. These ref­er­ences help users navigate the internet and reach ad­di­tion­al websites with just a single click. This article explains how to build strong, compliant backlinks and what to keep in mind when doing so.

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A backlink consists of a target URL and the element that links to it. In the case of a text link, a specific word or phrase—known as the anchor text—is hy­per­linked and directs users to the linked website. Images or graphics can also serve as links. Both types of backlinks are important for search engine op­tim­isa­tion and can pos­it­ively influence rankings.

A much greater influence on ranking comes from the dis­tinc­tion between dofollow and nofollow backlinks. These two forms differ tech­nic­ally by an attribute in the HTML code that affects Google’s eval­u­ation and ranking. The following table explains the exact impact and how and when to use dofollow and nofollow backlinks:

Link type Meaning Effect on SEO Example code
dofollow Links to trusted sources. Fully counted as a ranking signal. Without attribute: <a href="https://example.org/">Anchor text</a>
nofollow Links to sources you don’t want to ex­pli­citly endorse. Since 2019 treated as a hint and usually has only limited impact on rankings. With attribute: <a href="https://example.org/" rel="nofollow">Anchor text</a>
Note

Social signals are nofollow links from social networks. They can generate traffic but have limited SEO relevance and are therefore not suitable as a primary backlink strategy.

Google also dis­tin­guishes between two at­trib­utes for specific link types. They improve trans­par­ency and help prevent potential penalties.

Attribute Use SEO effect Example code
rel="sponsored" Labels paid or in­centiv­ised links (affiliate links, col­lab­or­a­tions, product samples). Provides trans­par­ency and helps avoid negative ranking effects. <a href="https://example.org/" rel="sponsored">Anchor text</a>
rel="ugc" User generated content (forum posts, blog comments, community platforms). Indicates the content was not created by the site operator. <a href="https://example.org/" rel="ugc">Anchor text</a>

Google evaluates a page’s link pop­ular­ity using the PageRank algorithm. In the early days of search engine op­tim­isa­tion, the guiding principle was that the more links pointed to a website, the more relevant it was con­sidered. Site operators took advantage of this focus on quantity by gen­er­at­ing large numbers of backlinks through so-called link farms. Google responded with several updates to its algorithm. Today, backlink eval­u­ation is much more soph­ist­ic­ated and also considers link quality.

Google improved its backlink analysis by di­ver­si­fy­ing ranking factors. However, the most widely used search engine does not reveal how heavily in­di­vidu­al factors are weighted. When building backlinks, it is therefore advisable to take all ranking factors into account and focus on natural link building. The following overview high­lights the most important ranking factors and explains how they influence rankings:

Ranking factor Impact on ranking
Anchor text and link context Using de­script­ive words or phrases in the clickable anchor text that reflect the content of the linked page is viewed pos­it­ively.
Authority of the linking page Links from low-quality sites or link farms can harm rankings and may even lead to penalties.
Topical relevance Backlinks from websites covering similar or relevant topics are valued more highly and can improve rankings.
Placement of backlinks Links placed prom­in­ently within the main content are generally con­sidered more valuable than those in the footer, nav­ig­a­tion bar, or sidebar.
Freshness of backlinks A lack of new backlinks over time can neg­at­ively affect rankings.
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Building backlinks is one of the online marketing basics for companies and a key part of off-page search engine op­tim­isa­tion. For lasting success, it’s important to avoid practices that Google devalues, as they can result in lower rankings for your website. The following section outlines the most frequent backlink-building mistakes.

Selecting websites

One of the most common mistakes occurs when selecting the websites where backlinks are placed. As a rule, you should avoid the following types of sites:

  • Websites that have no topical relevance to your own content
  • Websites that appear ma­nip­u­lat­ive and contain an unusually high number of links, which Google may classify as a link farm
  • Websites that sell backlinks or exist solely to create backlinks
  • Websites without real added value, a clear topical focus, or articles of no more than 400 words

Companies often support each other through net­work­ing, part­ner­ships, or other forms of col­lab­or­a­tion. When building backlinks, they may also agree to link to one another’s websites. However, Google ex­pli­citly warns against excessive re­cip­roc­al linking in its Webmaster Guidelines and may penalise this practice, even if both sites in­di­vidu­ally have high authority and cover similar topics.

Tip

Co­ordin­ate with at least two other website operators so that each site links to a different one. This prevents direct re­cip­roc­al linking, for example Website A links to Website B, Website B links to C, and C links back to A. Each website gains a new backlink without mutual linking between the same two sites.

Op­tim­ising anchor texts poorly

Ideally, anchor texts should be mean­ing­ful and include the main keyword of the linked page or other relevant terms. However, re­peatedly using the same anchor text every time you link to a website can lead to penalties from Google. Vary your anchor texts as much as possible and combine the keyword with other suitable wording. A natural mix of brand, nav­ig­a­tion­al, and keyword-based anchor texts is re­com­men­ded.

You have only limited control over anchor texts used on external websites that link to your website. Nev­er­the­less, it can be worth­while to contact other web­mas­ters and request more suitable anchor texts.

Backlinks from pages that are not indexed by Google, for example those marked with a noindex tag, have little or no impact on rankings. Since they do not appear in search results, Google gives them less weight. If a page has been removed from the index due to a violation of the Webmaster Guidelines, placing a backlink there is risky and should be avoided.

Google’s algorithm evaluates not only each backlink in­di­vidu­ally but also the overall set of links pointing to a website. This broader view helps determine whether a link profile has developed naturally or whether there are clear signs that many backlinks were created de­lib­er­ately by the site operator.

A natural link profile also includes a certain pro­por­tion of nofollow backlinks. If almost all links pointing to a page are dofollow, Google may treat this as sus­pi­cious. For the same reason, backlinks should be built gradually over time. It is also important that linking websites are varied and not limited to a single type of source, such as only forums or only web dir­ect­or­ies.

There are many ways to build backlinks, and it’s up to you to choose the ap­proaches that suit your website best. Keep in mind that quality matters more than quantity and avoid practices that could result in Google penalties. The following sections introduce the most common methods for building backlinks.

Web dir­ect­or­ies allow you to create backlinks that point to your own website. Although these submitted links carry re­l­at­ively little weight in Google’s eval­u­ation, they can be an easy way to establish a small number of backlinks at the beginning. Relevance is important here as well, so whenever possible, choose dir­ect­or­ies related to your industry. Local dir­ect­or­ies can be es­pe­cially valuable for location-based search results.

Another option for higher-quality links is forum par­ti­cip­a­tion. The challenge is that ex­per­i­enced mod­er­at­ors often recognise and remove obvious pro­mo­tion­al links. To build backlinks suc­cess­fully in forums, you should stay active beyond posting links and par­ti­cip­ate like a regular community member.

To earn or­gan­ic­ally generated backlinks, you need to create content that is spe­cific­ally designed for this purpose. These pieces are known as linkable assets. Par­tic­u­larly effective formats include in­ter­act­ive content such as in­nov­at­ive tools, useful resources, curated lists, graphics, contests, or engaging articles. In­fograph­ics require more effort to produce, but because of their high value, they are es­pe­cially likely to attract links from other websites.

Ideally, other site operators will share and link to your content without being prompted. In practice, however, mentions are not always ac­com­pan­ied by an active link. It is therefore advisable to regularly search for ref­er­ences to your content or brand and ask the re­spect­ive website owners to add a backlink. During this process, you can also review existing backlinks to ensure they are accurate and use ap­pro­pri­ate anchor texts. If necessary, reach out to web­mas­ters directly to request ad­just­ments.

Tip

YouTube Analytics shows an overview of all websites where your videos are embedded.

Guest posts are an effective way to build backlinks while also in­creas­ing brand awareness. Based on key backlink quality criteria, choose suitable websites for guest posting. First, check whether the sites are them­at­ic­ally relevant to your topic, even when dealing with high-quality blogs. Also review the existing outbound links and consider whether they add value and lead to reputable pages.

Note

It’s important that guest posts provide real added value and are not primarily intended for backlink building.

With ar­ti­fi­cial in­tel­li­gence, backlink strategies can be executed more ef­fi­ciently and with greater precision. Modern tools analyse com­pet­it­ors, identify high-quality link op­por­tun­it­ies, and pri­or­it­ise them based on relevance, authority, and topical fit. AI can also reveal content gaps on competing websites that you can address with targeted articles, studies, or visu­al­isa­tions, which supports natural backlink growth. It also makes outreach more efficient and more per­son­al­ised by gen­er­at­ing tailored emails, sug­gest­ing suitable anchor texts, and refining tone, timing, and subject lines.

AI reduces research time, improves success rates, and makes it easier to scale backlink-building efforts. However, it does not replace genuine re­la­tion­ship building with website operators or strong editorial quality. Creating valuable content that pub­lish­ers willingly link to remains essential.

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