SSL Certificate Checker

This tool allows you to check the SSL certificate details of any website. Enter a domain name to verify the SSL certificate status, expiration date, issuer information, and other important security details.

Enter a domain without http:// or https:// (e.g. example.com)
Certificate Status

Certificate Information
Issuer
Organization
Valid From
Valid To
Lifespan
Technical Details
Public Key Algorithm
Public Key Size
Signature Algorithm
Additional Domains

No additional domains found.

About SSL Certificates

SSL (Secure Sockets Layer) certificates are digital certificates that authenticate the identity of a website and enable an encrypted connection. They're essential for website security and customer trust.

Why Check SSL Certificates?
  • Verify if a website has a valid SSL certificate
  • Check when a certificate expires to avoid security warnings
  • View technical details about the encryption used
  • See which domains are covered by the certificate

About SSL Certificate Checker

Check the validity and details of an SSL certificate for any website. View expiration dates, issuer information, and security details.

Connect to a host and inspect the presented TLS certificate, hostname coverage, issuer, validity dates, chain, and common configuration issues.

Key features

  • Diagnostic scope Connect to a host and inspect the presented TLS certificate, hostname coverage, issuer, validity dates, chain, and common configuration issues.
  • Target input Enter the public domain or host whose HTTPS certificate should be checked, using the service port supported by the page.
  • Checks to review Review subject alternative names, issuer, serial, signature, valid-from/to dates, days remaining, chain trust, and hostname match.
  • Diagnostic result The report identifies the certificate currently served to the checker and highlights expiry or trust details useful for remediation.

How to use SSL Certificate Checker

Follow this workflow to work with SSL/TLS certificates safely and accurately.

  1. Enter the target Enter the public domain or host whose HTTPS certificate should be checked, using the service port supported by the page.
  2. Select the diagnostic scope Review subject alternative names, issuer, serial, signature, valid-from/to dates, days remaining, chain trust, and hostname match.
  3. Run the network check Run the SSL/TLS certificates diagnostic and retain status, timing, returned values, and the observation point needed to reproduce it.
  4. Correlate the result The report identifies the certificate currently served to the checker and highlights expiry or trust details useful for remediation.

Usage tips

  • Check every hostname and endpoint behind a CDN, load balancer, IPv4, and IPv6 path.
  • Renew early and monitor continuously; do not rely on a manual check near the expiry date.
  • Serve the complete intermediate chain while avoiding an unnecessary root certificate.

Frequently asked questions

Connect to a host and inspect the presented TLS certificate, hostname coverage, issuer, validity dates, chain, and common configuration issues.
Enter the public domain or host whose HTTPS certificate should be checked, using the service port supported by the page.
Review subject alternative names, issuer, serial, signature, valid-from/to dates, days remaining, chain trust, and hostname match.
The checker observes one network path and handshake. SNI, geo/CDN routing, client trust stores, TLS versions, and mutual TLS can produce different results elsewhere.