Is it true that migrating to HTTPS still loses PageRank with a 301 redirect?

Is HTTPS really a major ranking factor?

No, and this is where many are mistaken. Google uses HTTPS as a tiebreaker signal, not as a direct positioning lever. Specifically, if two pages respond equally to a query, the one in HTTPS will have a slight advantage.

This nuance changes everything. Some have sold the migration to HTTPS as an opportunity to gain positions: false. It’s merely a safety net that prevents being penalized against a competitor in HTTPS. Nothing more.

Why does a 301 redirect no longer dilute PageRank?

Historically, each redirect resulted in a PageRank loss estimated between 10 and 15%. Google gradually abandoned this principle, particularly to avoid penalizing legitimate technical migrations.

Mueller confirms here: a 301 from HTTP to HTTPS transmits 100% of the PageRank. This is consistent with previous statements where Google acknowledged that permanent 301s do not cause dilution in the contexts of redesign or protocol migration. Crawling remains smooth, and link juice circulates.

Should we still worry about managing redirects during migration?

Yes, but not for the reasons one might think. The real risk is not the loss of PageRank, but configuration errors: redirect chains, loops, forgotten strategic pages, redirects to 404 or irrelevant pages.

A poorly managed HTTPS migration can generate degraded loading times if the SSL certificate is not properly configured or if mixed content (HTTP in HTTPS) disrupts the display. This is where the problems arise, not with PageRank.

• HTTPS does not boost your positioning except in cases of a tie with a competitor
• A 301 from HTTP to HTTPS transmits 100% of PageRank
• Migration errors stem from technical issues (chains, loops, certificates) and not from the principle of the redirect
• The SEO gain from HTTPS is marginal compared to classic levers (content, backlinks, UX)
• Google expects HTTPS everywhere, it has become a security standard before being an SEO signal

Is this statement consistent with field observations?

Yes, and this is confirmed by hundreds of observed migrations. No significant drop in organic traffic has been noted during well-executed HTTPS transitions. Variations in positions post-migration are almost always due to other factors: modified content, changed templates, 404 errors, loading times.

What’s concerning is the persistent ambiguity regarding the exact weighting of the HTTPS signal. Mueller refers to it as a 'tiebreaker,' but no numerical data is provided. How often does this criterion actually come into play? [To be verified] under real conditions, as perfect equality between two pages is rare.

What nuances should be added to this claim?

Mueller's statement holds for a standard HTTP → HTTPS migration with proper 301s. It does not cover complex cases: cascading redirects, temporary redirects (302), migrations coupled with a complete site redesign.

Another point: the recrawl delay. Google takes several weeks to reindex all URLs in HTTPS, especially for medium or large sites. During this period, fluctuations may appear, not due to HTTPS, but due to the double crawling between HTTP and HTTPS. The crawl budget is utilized.

In what cases does this rule not apply?

If you chain multiple redirects (HTTP → www HTTPS → final page), you enter a chain that can slow down the crawl and fragment the user experience. Google follows, but at a cost in latency. Each jump adds to the response time.

Another case: a site migrating to HTTPS without fixing its mixed resources (images, CSS, JS still in HTTP). The browser blocks part of the content, which disrupts the display and degrades UX metrics. Google may interpret the page as less qualitative, not because of HTTPS itself, but due to its collateral effects.

What should you do concretely before migrating to HTTPS?

Audit your entire HTTP site before making any changes. List all indexed URLs in Search Console, check incoming backlinks, identify strategic pages. If you have 10,000 indexed URLs but only 2,000 generate traffic, prioritize those 2,000 in your redirect plan.

Next, prepare a clean redirect file: one line per URL, HTTP → HTTPS, without chaining. Test the SSL certificate in pre-production, ensure all resources (images, CSS, JS) are called in HTTPS. A single HTTP request in an HTTPS page generates a browser warning and undermines user trust.

What errors should you absolutely avoid during the switch?

Never redirect all HTTP URLs to the HTTPS home page. This is a common mistake that destroys crawl depth and loses all PageRank distributed across internal pages. Each HTTP URL should point to its exact equivalent in HTTPS.

Another trap: forgetting to update the XML sitemap and canonical tags. If your sitemap remains in HTTP after the migration, Google will continue to crawl the old URLs and delay the adoption of HTTPS. The same goes for canonicals: they must point to the HTTPS versions; otherwise, you create signal confusion.

How to check that the migration is well recognized by Google?

In Search Console, add the HTTPS property as a new property and monitor the indexing progress. Compare the number of indexed URLs in HTTP vs HTTPS over 4 to 6 weeks. Normally, HTTP should gradually disappear from the index in favor of HTTPS.

Use the URL inspection tool to test a few strategic pages. Google should display the HTTPS version as canonical. If this is not the case, look for a redirect or canonical tag issue. Also monitor server logs: the Googlebot should predominantly crawl in HTTPS after a few weeks.

• Audit all indexed URLs before migration
• Prepare a 301 redirect file page by page (no global redirect to the home page)
• Ensure all resources (images, CSS, JS) are in HTTPS
• Update the XML sitemap with HTTPS URLs
• Correct canonical tags to point to HTTPS
• Add the HTTPS property in Search Console
• Monitor indexing for a minimum of 4 to 6 weeks