SSL Checker

Instantly verify SSL certificate status, expiry, TLS version, fingerprints, HSTS and full certificate chain for any website.

100% Free Instant Results No Registration

Enter website to check SSL certificate

Instant CheckResults in under 3 seconds

Full ChainChecks entire cert chain

TLS DetectionDetects TLS 1.2 and 1.3

FingerprintsSHA-256 & SHA-1

About SSL Checker

The SSL Certificate Checker is a free online tool that verifies the SSL/TLS certificate status of any website — showing you whether the certificate is valid, when it was issued, when it expires, who issued it and whether the certificate chain is correctly configured. SSL certificates encrypt data between your website and visitors, and their validity is critical for both security and SEO.

Google has used HTTPS as a ranking signal since 2014. A missing, expired or misconfigured SSL certificate triggers browser security warnings that drive visitors away and hurt your rankings.

How to Check SSL Certificate

Enter the domain name (e.g. example.com)
Click Check SSL
View certificate details: issued by, valid from/to, domain coverage, chain status

What to Look For

Valid certificate — shows green padlock in browser address bar
Expiry date — set up auto-renewal; let's Encrypt certs expire every 90 days
Certificate covers your domain — including www. variant and any subdomains
Full chain installed — intermediate certificates included

Common SSL Issues

Expired certificate — renew immediately
Mixed content warnings — HTTP resources loaded on HTTPS page
Certificate hostname mismatch
Incomplete certificate chain

Free, instant SSL check, no login required.

Want to learn more? Read our complete guide: What is SSL and Does HTTPS Affect Google Rankings? →

Frequently Asked Questions

What does an SSL checker do?

An SSL checker connects to your website over HTTPS, retrieves the SSL/TLS certificate, and displays key details — including the issuer, expiry date, validity, TLS version, cipher suite, SANs, fingerprints, and HSTS status.

How do I fix an expired SSL certificate?

Log in to the platform where you purchased your SSL (or use a free CA like Let's Encrypt), renew or reissue the certificate, then install the new certificate on your server. Most hosting control panels (cPanel, Plesk) have a one-click SSL renewal option.

What is the difference between TLS 1.2 and TLS 1.3?

TLS 1.3 is faster and more secure than TLS 1.2 — it removes weak cipher suites and reduces the handshake to one round trip (vs two for TLS 1.2). Modern servers should support TLS 1.3 while keeping TLS 1.2 as a fallback.

What is HSTS and why does it matter?

HSTS (HTTP Strict Transport Security) is a security header that forces browsers to always use HTTPS for your domain, preventing protocol downgrade attacks. Without HSTS, attackers can intercept HTTP redirects to HTTPS.

Why do I see a certificate warning in browsers?

Common reasons: the certificate is expired, the domain doesn't match the certificate's Common Name or SANs, the certificate chain is incomplete, or the certificate is self-signed. Our SSL checker identifies all of these issues.

What are Subject Alternative Names (SANs)?

SANs are additional domain names secured by a single SSL certificate. Since Chrome 58 (2017), browsers only trust the SAN fields and ignore the Common Name. A certificate with SAN: example.com, www.example.com covers both domains.