Rankealo

ssl certificate checker

Free SSL Certificate Checker

Check any domain's SSL/TLS certificate in seconds. See validity, expiry, issuer, subject alternative names, TLS protocol, and cipher — free, no signup, works on any public domain.

Built for ssl certificate checker

Check SSL expiry and hostname coverage before it breaks trust

Use this SSL certificate checker to confirm that a domain is serving a valid certificate, the correct hostname coverage, and a modern TLS configuration before visitors hit warning screens.

It is especially useful for migrations, subdomain launches, CDN cutovers, and routine uptime checks where an expired or mismatched certificate can wipe out both conversions and rankings.

Common use cases

  • Catch expiring certificates before they take the site offline
  • Confirm SAN coverage for www, root-domain, and subdomain setups
  • Review TLS protocol and cipher details after hosting or CDN changes
Enter a domain to inspect its SSL/TLS certificate

How to Use the SSL Certificate Checker

  1. 1Enter a domain (example.com) — no https:// or path needed
  2. 2Click Check SSL to open a direct TLS connection on port 443
  3. 3Review certificate validity, expiry countdown, issuer, and subject
  4. 4Check the Subject Alternative Names to see which hostnames the cert covers
  5. 5Inspect TLS protocol and cipher to confirm you're on TLS 1.2+ with modern ciphers

Frequently Asked Questions

Don't Let Expired SSL Tank Your SEO

Rankealo monitors your site health continuously — including SSL expiry, schema errors, and indexing issues.

Keyword planning and topic scoring
Article generation with schema included
Publishing, tracking, and AI-search monitoring

AI Search Guides

Connect this tool to the bigger AI-search workflow

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GEO

Generative Engine Optimization

The core GEO framework, case study, and operating model for AI search visibility.

AEO

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GEO SEO

GEO SEO

How generative engine optimization fits into modern SEO and why the overlap matters.

AI Search

AI Search Optimization

The broader system behind modern AI search visibility across prompts, pages, and engines.

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