Free · No sign-up required

SSL certificate & HTTPS checker

Enter your domain to see in seconds who your certificate was issued to, when it expires and whether your site uses HTTPS correctly.

Checks the certificate, HTTPS redirect, HSTS and mixed content.

What does it check?

HTTPS is one of Google’s ranking signals; browsers show sites with certificate problems to visitors with a “Not secure” warning.

  • Certificate validity, issuer and certificate chain
  • Expiry date and days remaining
  • Certificate covers your domain
  • TLS version: should be 1.2 or 1.3
  • Redirect from the http URL to HTTPS and the HSTS header
  • Insecure resources loaded over http on the page

Frequently asked questions

What happens when my certificate expires?
Browsers open your site with a full-page security warning, and most visitors leave. Auto-renewing certificates like Let’s Encrypt eliminate this risk.
What is mixed content?
Mixed content means images, scripts or stylesheets loaded over http on an HTTPS page. Browsers may block them or remove the padlock icon from the address bar.
What is HSTS, and should I add it?
HSTS tells browsers to always open your site over HTTPS. If all your subdomains support HTTPS, adding it with a max-age of at least 6 months is recommended.

Other free tools

Technology & CMS detectorWordPress, Shopify, Ticimax… and server details DNS & email securitySPF, DMARC, MX and DNS records Security headers testHSTS, CSP, X-Frame-Options and cookie flags SEO analysis80+ checks, category scores and prioritized recommendationsPopular SEO site auditTechnical and on-page checks for up to 15 pagesPopular AI visibility checkDo ChatGPT and Perplexity recommend you?Popular

All free tools

See where your site stands in 20 seconds.

Find your technical issues and AI visibility gaps with a free analysis, then leave the fixing to AutoAiSeo.

  • No card required
  • 5-minute setup
  • Cancel anytime
Analyze for free