SSL Checker
Error
Valid Certificate Invalid / Expired
Subject (Owner) Details
| Common Name (CN) | |
| Organization (O) | |
| Organizational Unit (OU) |
Issuer (CA) Details
| Common Name (CN) | |
| Organization (O) | |
| Organizational Unit (OU) |
Certificate Validity
| Valid From | |
| Valid To | |
| Serial Number |
Properties & Constraints
| Basic Constraints | |
| Key Usage | |
| Extended Key Usage |
Subject Alternative Names (SANs)
Verify SSL and TLS certificates for any website. Check certificate validity, issuer information, expiration dates, and HTTPS security status instantly.
Monitor certificate expiration dates, trusted certificate authorities, and renewal schedules to help prevent browser security warnings and service interruptions.
Review supported TLS versions, certificate chain, encryption details, key length, and other technical information to evaluate your website's SSL configuration.
Frequently Asked Questions
What is an SSL certificate?
An SSL certificate is a digital certificate that encrypts communication between a website and its visitors. It verifies the website's identity, enables HTTPS, and helps protect sensitive information during transmission.
Why should I check my SSL certificate?
Regular SSL checks help ensure your certificate is valid, trusted, correctly configured, and not expired. This helps prevent browser security warnings and protects your website visitors.
What information does the SSL Checker display?
DomainScan displays certificate validity, issuer, expiration date, certificate chain, supported TLS versions, encryption details, and other publicly available SSL information.
Why does my browser show an SSL warning?
SSL warnings may appear if a certificate has expired, does not match the domain name, is not trusted by the browser, or the website is using an outdated TLS configuration.
How often should SSL certificates be renewed?
Most SSL certificates are valid for up to one year, while providers such as Let's Encrypt issue certificates valid for 90 days. Renew certificates before they expire to maintain uninterrupted HTTPS protection.
Can I use SSL Checker with other DomainScan tools?
Yes. Combine SSL Checker with WHOIS Lookup, DNS Lookup, DNS Propagation Checker, Domain Location Lookup, and Open Port Checker to perform a more comprehensive website and network analysis.