Is having a preferred domain in Google Search Console really essential to avoid losing link juice?

Why did Google emphasize the preferred domain so much?

In the days of the old Search Console, the preferred domain setting allowed webmasters to indicate to Google which version of a site (with or without www) should be considered canonical. The goal was simple: prevent backlinks pointing to example.com and www.example.com from being treated as two distinct entities.

In the reality of the 2010s, this fragmentation was common. A site would receive links either to its www version or its non-www version. Google would then divide the authority between these two variations, weakening the overall ranking potential of the domain.

Is this recommendation still valid today?

No, and that’s where the issue lies. Google removed this setting from Search Console in 2019, considering that webmasters should manage this unification at the technical level via 301 redirects or canonical tags. Today, if you do not correctly redirect one version to the other, you still risk diluting your authority.

The engine has become smarter in detecting duplicates, but nothing replaces a clean redirect. Relying on Google to guess which version to prioritize remains a risky strategy, especially if there are inconsistencies in your canonicals or internal linking.

What are the concrete risks of poor unification?

The first risk is PageRank dilution. If your backlinks are split between two technically different URLs, Google will not automatically consolidate this authority onto one variant. Result: your site underperforms without apparent reason.

The second risk concerns indexing. Google can index both versions, creating internal duplicate content. Even though the engine generally manages this situation well, you lose control over which version appears in the SERPs, and you waste crawl budget.

• Always implement a 301 redirect between www and non-www versions, without exception.
• Check the consistency of canonicals: all should point to the same domain variant.
• Audit existing backlinks to identify any distributions and, if possible, contact webmasters to correct the URLs.
• Control internal linking: a single internal link to the wrong version can create conflicting signals.
• Do not rely on Google to handle this unification for you, even if the engine has improved.

Is this statement still consistent with observed practices?

Partially. The principle remains valid: poor management of domain variants harms a site's authority. However, the recommended method (the setting in Search Console) no longer exists. This statement, likely from the late 2000s or early 2010s, has not been updated to reflect the current state of tools.

On the ground, it is observed that Google manages duplicates better than before, but not perfectly. Poorly configured sites still see their authority fragmented across multiple versions. [To be verified]: some SEOs claim that Google now automatically consolidates signals even without redirects, but no official data confirms this.

What nuances should be added to this recommendation?

The first nuance: the 301 redirect has become the only reliable lever. The preferred domain setting was a band-aid to address webmasters' technical shortcomings. Today, there are no excuses: a proper server or CDN configuration should automatically manage this redirect.

The second nuance: canonicals are not enough. While they signal to Google which version to prioritize, they do not consolidate backlinks at the HTTP level. A link to example.com remains a link to example.com, even if your canonical points to www.example.com. Only the 301 redirect truly transfers authority.

In what cases can this rule be circumvented?

Rare case: if your site uses strategic subdomains (blog.example.com, shop.example.com), each subdomain is treated as a distinct entity by Google. In this context, the www/non-www question arises for each individual subdomain.

What should be done concretely to unify your domain?

First step: choose a canonical version (www or non-www) and stick to it. There is no "best" objective choice, but the www version has historically been more common in larger organizations. Once this choice is made, configure a permanent 301 redirect from the other version to it.

Second step: deploy consistent canonical tags. All your pages should include a canonical pointing to the version with www (or without, according to your choice). Check that your CMS templates generate these tags automatically and correctly.

What mistakes should be avoided during this configuration?

First mistake: redirecting with a 302 instead of a 301. A temporary redirect does not transfer link authority. Google may ignore these redirects or interpret them as temporary, maintaining fragmentation.

Second mistake: forgetting to update internal linking. If your internal links point to the wrong version, you create unnecessary redirects with each click, slowing down crawl and diluting signals. Run a crawler (Screaming Frog, Oncrawl) to detect these inconsistencies.

How can I check that my site is correctly unified?

Test manually: type all four possible variants in your browser (http://example.com, http://www.example.com, https://example.com, https://www.example.com). All should redirect with a 301 to the chosen canonical version.

Use Search Console to verify that Google only indexes one property. If you see pages indexed on both versions (www and non-www), your redirects or canonicals are failing. Also, audit your backlinks via Ahrefs or Majestic to identify referring domains pointing to the wrong version.

• Set up a 301 redirect from the non-preferred version to the canonical version (www or non-www).
• Deploy consistent canonical tags across all pages, pointing to the correct variant.
• Ensure that internal linking consistently uses the canonical version in links.
• Test the four variants (HTTP/HTTPS, www/non-www) to confirm the redirection to the unique version.
• Audit indexing in Search Console to detect any residual duplicates.
• Monitor backlinks to spot links to the wrong version and contact webmasters as necessary.