Can having both HTTP and HTTPS hurt your rankings, or is it just wasting crawl budget?

Why does Google make a distinction between ranking and indexing?

Google clearly separates ranking impact from crawl efficiency. The HTTP/HTTPS duplication does not trigger an anti-duplicate content filter like genuine spam or scraping might do. The engine understands that these are two protocols for the same content.

But this tolerance has a cost: Googlebot must crawl two versions of the site instead of one. As a result, the crawl budget is split between HTTP and HTTPS. For a small site, the impact remains marginal. For a catalog of thousands of pages, or a media outlet publishing daily, the indexing delay becomes measurable.

What is crawl budget, and why does it matter here?

Crawl budget represents the number of pages that Googlebot is willing to crawl on a site within a given timeframe. This budget depends on domain authority, server response speed, and update frequency.

When HTTP and HTTPS coexist without a clear directive, Googlebot visits both. It wastes time on identical pages instead of exploring new URLs or refreshing modified content. Specifically, a page published in the morning may take twice as long to get indexed if the bot exhausts its quota on the HTTP version before crawling the HTTPS.

Do canonicals and redirects serve the same purpose?

No, their functions differ. A 301 redirect automatically sends the user and the bot from HTTP to HTTPS. This is the recommended solution for a migrated site: it transfers authority and eliminates duplication at the source.

The rel="canonical" indicates to Google which version to index but does not block the crawl of the other. The bot can still visit HTTP, see the canonical pointing to HTTPS, and adjust accordingly. It's a signal, not a barrier. In practice, the 301 is more effective and cleaner for managing HTTP/HTTPS.

• No ranking penalty: Google does not punish HTTP/HTTPS duplication as duplicate content.
• Crawl budget consumption: the bot visits the same content twice, slowing down the indexing of new content.
• Preferred 301 redirect: it transmits authority and eliminates duplication upstream, unlike the canonical, which remains a signal.
• Impact proportional to site size: the larger and more frequently updated the catalog, the greater the indexing delay.
• HTTPS as a standard: for years, Google has favored HTTPS in its algorithm; thus, migration is strategically important.

Is this statement consistent with real-world observations?

Yes, it aligns with what we observe during audits. Sites that keep both HTTP and HTTPS accessible simultaneously without a 301 redirect see their crawl frequency fragmented. In server logs, we observe Googlebot alternating between both protocols, sometimes multiple times a day on the same URLs.

On e-commerce sites with 50,000 references or media with daily publications, the delay in indexing can be measured in hours or even days. A product launched at 9 AM might not appear in the SERPs until the next day if the bot crawled the HTTP version first, consumed its quota, and will only return to HTTPS later. [To verify]: Google does not provide an official metric to quantify this delay based on site size.

What nuances should be added to this statement?

Mueller states that HTTP/HTTPS duplication

What concrete steps should I take to avoid this issue?

The reference solution: implement a permanent 301 redirect from all HTTP URLs to their HTTPS equivalents. This can be configured at the server level (Apache, Nginx) or via the CDN (Cloudflare, Akamai). The 301 transfers authority, eliminates duplication, and forces Googlebot to crawl only HTTPS.

If, for technical reasons, the 301 is not immediately feasible, add a rel="canonical" pointing to HTTPS in the of all HTTP pages. This is a stopgap measure that limits damage by signaling to Google which version to index. But keep in mind that the bot will still crawl HTTP, so the crawl budget remains fragmented.

What mistakes should I avoid during the HTTPS migration?

The first classic mistake: implementing HTTPS but forgetting to redirect HTTP. As a result, both versions remain accessible, and Google indexes both or hesitates between them. Ensure that all HTTP URLs redirect to HTTPS, including old pages, images, PDF files, etc.

The second pitfall: leaving internal links pointing to HTTP after the migration. This forces Googlebot to follow a redirect for each link, slowing crawl and diluting authority. Update your internal linking, XML sitemap, and hreflang tags to point directly to HTTPS.

How can I check if my site is correctly configured?

Start by testing manually: enter the HTTP URL in a browser and check that it redirects instantly to HTTPS. Then use a tool like Screaming Frog or Sitebulb to crawl the site and identify any residual HTTP URLs, poorly configured canonicals, or redirect chains.

In Google Search Console, monitor crawl statistics: if you still see crawl on HTTP while everything should be in HTTPS, it means there are still links or pages accessible in HTTP. Also, check that the submitted XML sitemap contains only HTTPS URLs, and that the HTTP and HTTPS properties are correctly grouped, or that only HTTPS is active.

• Implement a permanent 301 redirect from HTTP to HTTPS on all URLs
• Ensure that internal linking, XML sitemap, and hreflang point to HTTPS
• Add rel="canonical" to HTTPS if the 301 cannot be implemented immediately
• Crawl the site with Screaming Frog to detect residual HTTP URLs
• Monitor server logs to confirm that Googlebot is no longer crawling HTTP
• Check in Search Console that only the HTTPS property receives crawl and impressions