Should you really set inter-site links to nofollow?

What exactly makes an inter-site link natural?

Google differentiates between links from completely independent sites and those that connect properties belonging to the same entity. An international .com linking to its UK counterpart .co.uk falls into the latter category.

The engine views these connections as logical from a user perspective: a UK visitor directed to the local version of the site enjoys a better experience. This perceived naturalness allows the transfer of PageRank without triggering negative signals.

How does this statement contradict certain established practices?

For years, many SEOs have systematically applied nofollow to all outbound links, including those to their own properties. This conservative approach aimed to preserve internal PageRank.

Mueller's position turns this logic on its head: blocking the flow of PageRank between legitimately related sites is a strategic mistake. You prevent your satellite properties from benefiting from the authority accumulated by the main site.

In what context does this rule truly apply?

The key lies in the legitimacy of the inter-site relationship. A group owning multiple brands, geolocalized versions, or specialized sub-brands can establish a natural link structure.

Conversely, a network of sites created artificially to manipulate PageRank remains punishable. Google analyzes the editorial and commercial consistency: do the sites share an identity, legal notices, and an obvious business logic?

• Legitimate inter-site relationships: language versions (.fr/.de/.it), regional variations (.com/.co.uk), brands from the same group with clear identity
• Allowed PageRank transfer: no need for nofollow if the connection provides real user value
• Consistency required: shared legal notices, common visual identity, transparent business logic
• Limit to respect: the linking structure must not be created solely to manipulate rankings

Is this statement in line with real-world observations?

Experience feedback generally confirms this stance. Multi-country sites that have removed the nofollow from their cross-version navigation links have not faced penalties, and some have even noticed an improvement in rankings on secondary versions.

The critical point concerns the definition of "natural" that Google uses here. Mueller intentionally remains vague on the precise criteria that determine whether a network of sites is acceptable or manipulative. [To be verified] to what extent mere common legal ownership suffices, or if Google requires a more thorough editorial consistency.

What nuances should we add to this rule?

The volume of links matters as much as their nature. A main site pointing to five regional variations via a language selector remains within normal limits. The same site creating fifty contextual links to satellite properties would trigger alerts.

Excessive reciprocity is also a negative signal. If site A heavily links to site B, and B systematically links back to A with the same intensity, the pattern becomes suspicious even if both properties belong to the same entity.

In what cases does this rule not apply at all?

PBNs (Private Blog Networks) remain firmly outside the acceptable framework, even if you own them. Google deems a network of sites created solely to generate artificial backlinks as failing to meet any legitimate user needs.

Satellite sites created to capture traffic on ancillary queries and then redirect to the main site also fall into the red zone. If a site’s only function is to serve as an SEO relay without offering coherent standalone content, the link should be nofollow or the site reconsidered.

What steps should you take with your inter-site links?

Start by mapping out your entire digital ecosystem: list all the sites, their legal relationships, their business functions, and their editorial consistency. This overall view often reveals overlooked inconsistencies.

For each existing inter-site link, ask yourself this question: "Does this link provide clear value to the user?" A language selector, a link to a sister brand in a comparison article, or a redirect to a regional store: yes. A generic footer link to ten unrelated properties: no.

What mistakes should you avoid when restructuring inter-site linking?

Don't remove nofollow en masse without analyzing each case. A site can contain both legitimate links to regional versions and dubious links to abandoned microsites created five years ago for a marketing campaign.

Also, avoid the opposite excess: over-optimizing the anchor text of inter-site links with exact keywords. Google detects these patterns. A link to your UK site should use a natural and descriptive anchor ("UK Version" or "Shop in GBP"), not "buy cheap widgets online UK".

How can you check if your multi-site architecture is compliant?

Use Search Console to analyze the incoming link profile of each property. If 80% of a site's backlinks come from other sites you control, the imbalance raises alarm bells.

Check the consistency of legal notices, terms of sale, and privacy policies among sites. Google cross-references this information to establish relations between properties. Obvious inconsistencies (different addresses, legal entities without apparent ties) undermine the network's legitimacy.

• Audit all links between your properties and identify those that truly serve the user
• Remove nofollow only for links justified by a clear business logic (language versions, regional links, sister brands)
• Check the consistency of legal entities and legal notices between linked sites
• Maintain a healthy balance between inter-site links and independent external backlinks
• Use natural and descriptive anchors, never over-optimized
• Document the relationship between sites in an internal file to justify the strategy during any potential manual audit