Free SSL Certificate Checker Online
Verify SSL certificate details, expiration, and validity for any domain
Complete SSL Analysis
Verify certificate validity and configuration at a glance
See the certificate issuer, subject, serial number, and signature algorithm used for the SSL certificate.
Check the exact issue and expiration dates to ensure your certificate is current and plan renewals.
Get an instant pass or fail assessment of the certificate validity including chain verification.
About Our SSL Checker
Our free SSL certificate checker retrieves and analyzes the SSL/TLS certificate for any domain name. See the certificate issuer, validity period, protocol version, and overall status in a clean, readable format. Essential for website security monitoring and troubleshooting HTTPS issues.
Frequently Asked Questions
What is an SSL certificate?
An SSL/TLS certificate is a digital document that authenticates a website identity and enables encrypted communication between the browser and server.
Websites with valid SSL certificates show a padlock icon in the browser address bar and use the HTTPS protocol.
SSL certificates are issued by Certificate Authorities (CAs) like Let's Encrypt, DigiCert, and Comodo.
Why should I check my SSL certificate?
Expired or misconfigured SSL certificates cause browser security warnings that drive away visitors and harm search rankings.
Regular checks help you catch expiration dates before they cause downtime and verify that renewals were applied correctly.
Checking also helps identify misconfigured certificate chains that may cause issues on some devices.
What happens when an SSL certificate expires?
When a certificate expires, browsers display a prominent security warning page that most visitors will not bypass. This effectively makes your website inaccessible.
Search engines may also downrank sites with expired certificates, and some services that depend on HTTPS will stop working.
Set up monitoring or auto-renewal to prevent certificate expiration.
What is a certificate chain?
A certificate chain is the sequence of certificates from your domain certificate up through intermediate certificates to the root Certificate Authority.
All certificates in the chain must be valid and properly configured for browsers to trust the connection.
Missing intermediate certificates are a common cause of SSL errors on some devices while working fine on others.