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Technical SEO · Free Tool

Free SSL Certificate Checker

An expired or misconfigured SSL certificate can destroy user trust and tank your search rankings overnight. This tool checks your certificate's validity, days until expiry, issuer, TLS version, HSTS header, and whether HTTP automatically redirects to HTTPS.

What This Tool Checks

  • check_circleCertificate validity: valid/expired/not-yet-valid status
  • check_circleDays until expiration with visual warning at 30 days
  • check_circleCertificate issuer and CA (Certificate Authority) name
  • check_circleTLS protocol version: TLS 1.2, TLS 1.3 (TLS 1.0/1.1 flagged as insecure)
  • check_circleHSTS header presence: Strict-Transport-Security check
  • check_circleHTTP → HTTPS redirect: confirms automatic secure redirect is in place
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Why This Matters for SEO

HTTPS is a confirmed Google ranking factor since 2014. An expired SSL certificate triggers browser "Not Secure" warnings that immediately destroy user trust and increase bounce rate dramatically. Modern browsers block users from accessing sites with invalid certificates. Beyond SEO, SSL is required for GDPR compliance and any payment processing.

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Frequently Asked Questions

What is an SSL certificate?expand_more
An SSL certificate (more accurately called a TLS certificate) is a digital document that authenticates your website's identity and enables encrypted HTTPS connections. When a visitor connects to your site, the certificate proves your server is who it claims to be, and establishes an encrypted tunnel so data can't be intercepted in transit. Browsers display a padlock icon for sites with valid SSL certificates.
Does SSL affect Google rankings?expand_more
Yes. Google confirmed HTTPS as a ranking signal in 2014. Sites serving over HTTPS receive a slight ranking boost over HTTP equivalents. More importantly, since 2018 Chrome marks all HTTP pages as "Not Secure," which significantly damages user trust and click-through rates from search results. Having a valid SSL certificate is now a baseline requirement, not a competitive advantage.
How do I check if my SSL certificate is valid?expand_more
Enter your domain URL above and click "Check SSL." Our tool connects directly to your server, retrieves the SSL certificate, and checks: whether it's currently valid, how many days until it expires, whether the domain names match, the TLS version used, and whether HSTS is configured. The whole check takes under 5 seconds.
What is HSTS and why does it matter?expand_more
HSTS (HTTP Strict Transport Security) is an HTTP header that tells browsers to always connect to your site over HTTPS, never HTTP — even if the user types the URL without "https://". Without HSTS, users who type your URL directly may briefly connect over HTTP before being redirected. HSTS eliminates that insecure window and is considered a security best practice.
What TLS version should my site use?expand_more
Your site should use TLS 1.2 or TLS 1.3. TLS 1.3 is the latest and fastest version, offering improved performance and security. TLS 1.0 and TLS 1.1 are deprecated and insecure — major browsers have removed support for them. If our tool detects you're using TLS 1.0 or 1.1, you should update your server configuration immediately.
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Get SSL expiry alerts before your site breaks

PerfBee monitors your SSL certificate and sends you an alert 30 days before it expires — so you never get caught out. Get daily crawl reports, broken link alerts, Core Web Vitals tracking, and AI fix suggestions — across your entire site.

  • checkCrawl unlimited pages — daily, automatic
  • checkBroken link detection across your whole site
  • checkCore Web Vitals & Lighthouse audits per page
  • checkAI-powered code fix suggestions
  • checkWhite-label PDF reports for clients
  • checkEmail alerts for new issues & downtime
Start Free Uptime & SSL Monitoringarrow_forwardView Pricing

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