Why is HTTPS still considered a minor ranking factor even though it is mandatory?

Does HTTPS actually provide measurable SEO benefits?

The answer is nuanced. Google introduced HTTPS as a ranking factor in 2014, but immediately labeled it as "light." This means that two strictly equivalent pages will see the HTTPS one slightly favored. However, this boost remains marginal compared to signals like content quality, backlinks, or user experience.

In practice, many sites have migrated to HTTPS without noticing an improvement in rankings. Why? Because the positive impact of HTTPS is largely offset by the risk of technical errors during the migration: poorly configured redirects, wasted crawl budget, loss of PageRank signals if the 301 redirects do not cover all URLs. The theoretical benefit vanishes quickly if the execution is shaky.

Why does Google emphasize planning the migration?

Because the slowdowns mentioned by Mueller are not about loading speed, but about disruptions in crawling and indexing. A poorly orchestrated HTTPS migration forces Google to recrawl the entire site, reevaluate trust signals, and consolidate old HTTP URLs with new HTTPS ones. This process takes time.

During this transition phase, you risk fluctuations in rankings, even temporary drops in visibility. Google must relearn your site’s structure, and any bugs (broken SSL certificate, mixed content, misconfigured canonicals) amplify the problem. Rigorous planning thus becomes a non-negotiable prerequisite to limit damage.

What are the most common technical pitfalls?

The first pitfall is mixed content: resources (images, CSS, JavaScript) loaded over HTTP on an HTTPS page. Browsers block or alert users, degrading the user experience and possibly affecting how the page is rendered to Googlebot. The result: incomplete pages in the index.

The second pitfall: partial 301 redirects. Many sites only redirect the homepage and a few main pages, leaving thousands of deep URLs still on HTTP. These orphaned pages lose their SEO value and gradually disappear from the index. Finally, forgetting to update Search Console with the new HTTPS property prevents error tracking and delays the detection of critical issues.

• HTTPS is a weak signal: it does not compensate for structural deficiencies (poor content, faulty internal linking).
• The migration is the real challenge: redirects, canonicals, Search Console, sitemaps must be impeccably configured.
• Mixed content ruins the experience: all resources must be served over HTTPS without exception.
• Crawl budget is quickly consumed: Google must recrawl the entire site, which can take several weeks for large volumes.
• Monitoring tools are essential: Google Search Console, server logs, and crawling tools help detect errors before they settle in.

Is this statement consistent with real-world observations?

Completely. Audits show that HTTPS alone never propels a site from page 3 to page 1. Instances where HTTPS has a visible impact concern ultra-competitive SERPs where all other factors are equal. In other words, HTTPS acts as a tie-breaker, not as a growth lever.

What seems less aligned is Google's push for HTTPS primarily for security reasons (Chrome displays "Not secure" for HTTP sites) while minimizing its SEO weight. The message is twofold: "Do it, but don't expect miracles." [To verify]: Google has never published quantitative data on the exact extent of the HTTPS boost. We remain in a fog of uncertainty.

What nuances should be added to this recommendation?

First, industry context matters. For an e-commerce site or a platform handling sensitive data, HTTPS is non-negotiable for legal reasons (GDPR) and user trust. The SEO signal becomes secondary. In contrast, for an informational blog without forms, the pressure is lower, even if Chrome will display a warning.

Next, the age of the site plays a role. Migrating a 10-year-old site with 50,000 indexed pages and thousands of external backlinks poses significant risk. The incoming backlinks lead to HTTP URLs: if the 301s are not permanent or if some referring sites break their links, you lose PageRank. Conversely, a new site starts directly on HTTPS without friction.

In what cases does this rule not fully apply?

For international multi-domain sites, the HTTPS migration complicates things: each ccTLD or subdomain requires its own SSL certificate. Wildcard certificates or multi-domain (SAN) certificates exist, but their configuration is trickier. A certificate error on a single subdomain can block the indexing of entire sections of the site.

Another edge case: sites with many external resources (iframes, widgets, ads). If these third parties do not support HTTPS, you are stuck with mixed content that cannot be corrected without cutting these integrations. Sometimes, the migration cost (loss of ad revenue, redesign of widgets) far exceeds the hypothetical SEO gain. Let’s be honest: in these situations, HTTPS becomes more of a technical constraint than an optimization lever.

What should you do before migrating to HTTPS?

Before touching anything, audit all your resources: pages, images, scripts, stylesheets, fonts, iframes. Use a crawler (Screaming Frog, Oncrawl) to list all internal and external HTTP URLs. Identify which URLs need to switch to HTTPS and which will remain HTTP (uncontrollable third-party resources).

Next, acquire and install a valid SSL certificate for all your domains and subdomains. Favor a wildcard certificate if you have multiple subdomains. Test the installation on a staging environment before pushing it to production. Make sure the certificate covers all variants (www and non-www) and does not generate any browser alerts.

What mistakes should you absolutely avoid during migration?

Never migrate without implementing permanent 301 redirects from each HTTP URL to its HTTPS equivalent. The redirects must be individual (page by page), not generic redirects to the homepage. A wrongly configured .htaccess or nginx rule can send all traffic to a single page, destroying indexing.

The second fatal mistake: forgetting to update your XML sitemaps, robots.txt files, and canonical tags. If your canonicals still point to HTTP URLs after migration, Google will consider the HTTP version as the primary and ignore the HTTPS version. The result: content duplication and dilution of PageRank. Lastly, do not neglect updating your backlink profiles (directories, partners) so they point directly to HTTPS.

How can you check if the migration went smoothly?

Use Google Search Console to track the indexing of the new HTTPS property. Compare the number of indexed URLs before and after migration. A sudden drop signals a problem (broken redirects, pages blocked by robots.txt, SSL errors). Also, monitor coverage errors and security warnings.

Analyze your server logs to verify that Googlebot is crawling the HTTPS URLs and no longer the HTTP ones. If the bot continues to hit the old HTTP URLs massively, your redirects are not functioning correctly. Finally, manually test a sample of pages with tools like SSL Labs to detect configuration issues (expired certificate, outdated TLS protocols, residual mixed content).

• Create a comprehensive inventory of all resources (pages, media, scripts) to be migrated.
• Install a valid SSL certificate covering all relevant domains and subdomains.
• Configure permanent 301 redirects page by page, never in bulk to the homepage.
• Update XML sitemaps, robots.txt, canonicals, hreflang, and Open Graph tags.
• Add the new HTTPS property in Google Search Console and submit the HTTPS sitemap.
• Monitor server logs and Search Console reports for at least 4 weeks post-migration.