SSL Certificate Checker
Check SSL/TLS certificate validity, expiry and issuer for any domain.
Try it with this example
Enter a domain like google.com to verify its SSL/TLS certificate: expiry date, issuer, and full chain. Catch expiring certs before downtime.
What is this tool?
HTTPS relies on SSL/TLS certificates to encrypt traffic and prove a server's identity. A valid certificate shows visitors that the connection is secure and that the domain belongs to the expected organization. Expired or misconfigured certificates cause browser warnings, break APIs, and damage trust. This SSL Checker lets you verify a domain's certificate: expiry date, issuer, chain, and key details. Enter a domain and get an instant report.
The tool fetches the certificate presented by the server and displays its common name, issuer (Certificate Authority), validity period, and fingerprint. It also checks the chain: whether the certificate is signed by a trusted CA and whether intermediate certificates are correct. A broken chain can cause "certificate not trusted" errors even when the certificate itself is valid. Seeing the full chain helps diagnose those issues. Expiry is critical—certificates typically last 90 days to a year. Set a calendar reminder before expiration; this tool shows exactly when renewal is due.
Site owners use the checker to verify their own certificates after installation or renewal. Before going live, confirm the certificate covers the right domain, hasn't expired, and chains to a trusted root. Developers integrating with third-party APIs check certificates to ensure connections are secure and to debug TLS errors. Support teams use it when users report "your connection is not private" or similar warnings—the report shows whether the problem is expiry, mismatch, or chain issues.
Let's Encrypt and other CAs provide short-lived certificates to encourage automation. Manual checks still matter for monitoring and troubleshooting. If a certificate expires, the site becomes unreachable until it's renewed. Running this check periodically, or after changes to your hosting or CDN, helps avoid surprises. The tool also reveals certificate details that might explain interoperability issues with older clients or specific browsers.
No signup or API key needed. Enter any domain and get the result. The check runs from our server, so you see what the public internet receives when connecting to that domain.