SSL Certificate Checker
Inspect certificate details, issuer, SANs, and expiry.
About this SSL Certificate Checker
Check SSL certificate details, SANs (Subject Alternative Names), issuer information, and expiry dates for any host. Our SSL checker verifies SSL/TLS certificate validity, displays certificate information, checks expiration dates, and identifies certificate issues. Perfect for monitoring certificate expiration, verifying SSL configuration, troubleshooting SSL problems, or ensuring websites have valid certificates.
Key Features
Check SSL certificate validity
Display certificate details (issuer, subject, validity period)
Show SANs (Subject Alternative Names)
Check certificate expiration dates
Verify certificate chain
Identify certificate issues
Test any hostname or domain
Works entirely in your browser
How to Use
Enter the hostname or domain to check
Click 'Check SSL' to verify certificate
View certificate details and information
Check expiration date and validity period
Review SANs and certificate chain
Identify any certificate issues
Monitor certificate expiration
Verify SSL configuration
Popular Use Cases
Monitor SSL certificate expiration
Verify SSL certificate installation
Check certificate validity for websites
Troubleshoot SSL connection issues
Verify certificate chain configuration
Check SANs for multi-domain certificates
Ensure websites have valid SSL certificates
Monitor certificate renewal dates
Tips & Best Practices
Check certificates regularly to avoid expiration
Monitor expiration dates well in advance
Verify that certificates cover all required domains (SANs)
Check certificate chain for proper configuration
Use for troubleshooting SSL connection problems
Verify certificate issuer and validity
Set reminders for certificate renewal
Frequently Asked Questions
What is an SSL certificate?
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables encrypted connections. It's essential for HTTPS websites.
How do I know if a certificate is valid?
The checker will show certificate validity, expiration date, and any issues. A valid certificate should not be expired, should match the domain, and should have a proper certificate chain.
What are SANs?
SANs (Subject Alternative Names) are additional domain names covered by a single SSL certificate. They allow one certificate to secure multiple domains or subdomains.
What happens when a certificate expires?
When an SSL certificate expires, browsers will show security warnings and users may not be able to access the site securely. Certificates should be renewed before expiration.