SSL Checker — Free HTTPS Certificate Inspector

Verify any website's SSL/TLS certificate in seconds. Our free SSL checker shows the issuer, validity dates, subject and SAN domains, key strength, chain of trust, and supported TLS versions — useful for confirming an HTTPS rollout, debugging certificate errors, and spotting weak crypto.

What an SSL checker reveals

Issuer (Let's Encrypt, DigiCert, Sectigo, Google Trust Services), validity window, common name, all SAN entries, signature algorithm, key size, and the full intermediate chain. We also report the highest TLS version the server negotiates.

Why your SSL might fail in browsers

Expired certificate, missing intermediate, wrong common name, self-signed cert, mixed-content warnings, or unsupported TLS version (browsers now drop TLS 1.0 and 1.1). Each shows up as a specific error in this checker.

SSL grade vs SSL checker

Our checker reports the facts of the certificate. SSL Labs goes further and gives an overall A–F grade including cipher suites and protocol downgrades. Use both.

TLS versions and current browser support
VersionStatusRecommendation
TLS 1.3Modern, fastestRequired for new deployments
TLS 1.2Widely supportedKeep enabled as a fallback
TLS 1.1DeprecatedDisable — blocked by major browsers
TLS 1.0InsecureDisable — known POODLE/BEAST issues
SSL 3.0BrokenMust be disabled

Frequently Asked Questions

Is the SSL checker free?

Yes — free, unlimited, no signup.

How do I check if my SSL certificate is valid?

Enter your domain above. We connect over HTTPS and report issuer, expiry, chain, and TLS version.

Can I check SSL for any port?

Default is 443. Many services (SMTPS 465, IMAPS 993, custom) also serve TLS — supply a port if needed.

Why does my certificate say 'not trusted'?

Usually a missing intermediate. Re-install the full chain bundle from your CA — Let's Encrypt's fullchain.pem is the canonical example.

How often should I renew SSL?

Let's Encrypt expires every 90 days and most clients renew automatically at day 60. Commercial certs typically run 1 year.

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