How does Google actually handle backlinks after a domain change?

Does Google really guarantee the total transmission of PageRank during a redirect?

Mueller's statement is reassuring on the surface: links to the old domain count as if they pointed directly to the new one. This theoretically means that no dilution occurs in the transfer of PageRank.

However, this claim deserves some nuance. Field observations show that the transmission is never instantaneous, and Google sometimes takes weeks to recrawl all redirected pages. During this latency period, your new domain operates with only a fraction of its link capital.

Why is it necessary to check backlinks in Search Console after a migration?

Mueller emphasizes the need to consult the link reports in Search Console. This advice is not trivial: it implies that Google may encounter difficulties interpreting certain redirects.

In practical terms, if you notice that historically strong links no longer appear in your reports, it is likely that Google is not properly following the redirect chain. This often happens with multiple redirects (301 to 302 to 301) or poorly managed GET parameters.

Does the type of redirect influence the transfer of power?

Google doesn't explicitly state this here, but not all redirects are created equal. A permanent 301 is interpreted as a definitive transfer of authority. A temporary 302, in theory, should not transmit PageRank in the same way.

In practice, Google tends to treat 302 redirects as 301s if they remain in place long enough. But this tolerance is not officially documented, and you take an unnecessary risk by not setting up a real 301 from the start.

• Backlink transmission: Google considers links to the old domain as pointing to the new one, but with a variable recrawl delay.
• Mandatory verification: Search Console is the go-to tool to confirm that Google is actually following your redirects.
• Type of redirect: Always prefer a permanent 301 to avoid any ambiguity in Google's interpretation.
• Redirect chains: Avoid cascading redirects (A→B→C), as Google may stop following beyond 3 jumps.
• Long-term maintenance: Keep redirects active for at least 12 months, ideally indefinitely for high-traffic URLs.

Does this statement reflect the reality observed in the field?

Yes and no. In well-executed migrations, with clean 1:1 redirects, the transmission actually works as described. We see a retention of 80-95% of organic traffic in the 2-3 months following the switch.

However, in complex migrations — structural redesign, merging multiple domains, drastic changes in hierarchy — things get trickier. Google can take 6 to 9 months to stabilize positions, even with technically perfect redirects. Mueller's statement does not mention these adjustment periods, which can create false expectations. [To be verified]: no official data on the average time for a complete recrawl after migration.

What unmentioned pitfalls exist in this statement?

Mueller does not address the gradual loss of power from redirected backlinks. A direct link is always worth more than a link going through a redirect, especially if that redirect traverses multiple domains or remains in place for years.

He also omits the issue of link anchors. If your old domain received backlinks with highly optimized exact anchors, and you redirect to URLs with slightly different content, Google may reassess the relevance of these links. Result: they count, but not with the same strength as before.

In what cases does this rule not apply as expected?

First exception: penalized domains. If your old domain faced manual action or partial deindexing, Mueller does not guarantee that you will start with a clean slate. Google may very well transfer the penalty, especially if the content remains unchanged.

Second exception: international migrations with a change in geotargeting. Redirecting a .fr to a .com changes the geographical relevance perceived by Google. French backlinks will continue to count, but their relative weight may diminish if Google detects an intention to target a different market.

What concrete steps should you take before switching to a new domain?

First, map all your URLs with a professional crawler (Screaming Frog, Oncrawl). You need to identify every page receiving at least one external backlink, even if weak. Then, create a 1:1 correspondence table between old and new URLs.

Don't simply redirect all 404s to the homepage. That’s the worst mistake possible. Each URL must point to its closest thematic equivalent on the new domain. If a page has no direct equivalent, redirect it to the relevant parent category, never to the homepage.

How can you ensure that Google correctly handles the redirects?

Once the migration is complete, submit both sitemaps (old and new domain) in Search Console. Force a recrawl of the main URLs using the URL inspection tool. Don’t rely on Google to discover your redirects passively.

Monitor coverage reports daily for the first 4 weeks. If you see 4xx or 5xx errors increasing, some redirects are failing. Compare the list of backlinks before and after migration: if historically strong links disappear from the reports, investigate immediately.

What critical mistakes must be avoided at all costs?

Never delete the old domain until Google has recrawled 95% of the redirected URLs. This can take 6 months for a large site. Too many people cut the redirects after 2-3 months, thinking that is sufficient. Result: a loss of 30-40% of organic traffic.

Avoid modifying both the site structure AND the domain simultaneously. A successful migration is an isolated migration: change the domain first, stabilize positions, then redesign the structure if necessary. Mixing both variables makes diagnosing problems nearly impossible.

• Establish a 1:1 redirection matrix before any technical switch
• Ensure all redirects return a 301 status code, not 302 or 307
• Test redirects with an external tool (redirect-checker.org) to detect loops or chains
• Keep both Search Console properties active for a minimum of 12 months
• Monitor the evolution of detected backlinks each week post-migration
• Maintain the old domain active and redirects operational for at least 1 year