RankWiki

Technical SEO

SSL SEO

SSL in SEO refers to using an HTTPS-secured site connection that encrypts data between the browser and server and is treated by Google as a lightweight ranking signal.

Also called
TLS (Transport Layer Security)
Applies to
Technical SEO, HTTPS migration
Commonly confused with
HTTPS, certificate validation levels

Key points

  • HTTPS is a baseline security and trust requirement for any website.
  • Google treats HTTPS as a lightweight ranking signal, but it is not a replacement for content or links.
  • Migrating to HTTPS requires full redirects and internal link updates to avoid losing rankings.
  • Mixed content on HTTPS pages can cause browser warnings and weaken security.
  • Installing an SSL certificate does not significantly boost rankings on its own.

Why it matters

Failing to implement HTTPS correctly can break user trust and browser behaviour. If you host your site on a seo vps, SSL configuration must be correct to avoid certificate errors. Similarly, web designer seo best practices include ensuring all assets load over HTTPS. Mixed content, where HTTP resources are loaded on an HTTPS page, can trigger security warnings and block rendering. This directly affects how Googlebot can crawl google the site; blocked resources may prevent indexing. Proper HTTPS implementation is a baseline requirement; without it, the site risks losing rankings and credibility.

Where it changes your decision

  • Deciding to migrate from HTTP to HTTPS: requires full redirect mapping and internal link updates to preserve ranking signals.
  • Reviewing a site for browser security warnings: mixed content or expired certificates can cause padlock warnings, reducing user confidence.
  • Choosing between certificate validation levels: the validation level (DV, OV, EV) does not affect SEO; only secure implementation matters.
Read next Tinypng After securing your site with HTTPS, image optimisation with TinyPNG can further improve page speed and user experience.

Questions people ask

SSL vs TLS?

SSL and TLS are cryptographic protocols. TLS is the successor to SSL and is more secure. Modern websites use TLS, but the term SSL is still commonly used as shorthand.

Is SSL deprecated?

SSL has been deprecated in favour of TLS. The SSL protocol has known vulnerabilities and is no longer considered secure. Most browsers and servers reject SSL connections.

Is SSL still used?

Yes, the term SSL is still widely used to refer to TLS-based secure connections. However, the actual SSL protocol is almost never used; modern implementations use TLS.

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Sources

  1. Google Search Central Best source for Google's guidance on HTTPS, site migrations, and search-related best practices.
  2. Google Search Central documentation on HTTPS Direct guidance on HTTPS as a ranking signal and implementation expectations.
  3. Google Search Central site moves with URL changes Useful for HTTP-to-HTTPS migration behavior, redirects, and preserving signals.
  4. SSL.com Clear technical explanations of SSL/TLS, certificates, encryption, and HTTPS.

Written and maintained by Nora Lindholm. Last updated 27 July 2026.

Spotted an error? Email me — corrections are logged and credited on the entry. Outbound links are unpaid; most are nofollow.