Free SSL Certificate Checker
Test your SSL/TLS certificate validity, expiration date, and get an instant security grade (A+ to F)
Certificate Validity
Verify that your SSL certificate is valid, properly issued, and not expired.
Expiration Alerts
Get alerts about upcoming certificate expiration to prevent downtime.
Chain Verification
Ensure your certificate chain is complete and properly configured.
Security Analysis
Get a security grade and recommendations to improve your SSL configuration.
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 an encrypted connection. When you see HTTPS and a padlock icon in your browser, it means the site has an SSL certificate protecting your data.
What do the SSL grades (A+ to F) mean?
SSL grades indicate the security strength of your certificate configuration. A+ is the highest rating, meaning excellent security with modern protocols and cipher suites. F indicates serious security issues. Most websites should aim for at least a B grade, while e-commerce and banking sites should target A or A+.
How often should I check my SSL certificate?
We recommend checking monthly and especially before your certificate expires. Set up monitoring for expiration dates - most certificates are valid for 90 days (Let's Encrypt) to 1 year. An expired certificate will cause browser warnings and loss of visitor trust.
What is a certificate chain and why does it matter?
A certificate chain connects your SSL certificate to a trusted root Certificate Authority (CA). If the chain is incomplete, some browsers won't trust your certificate. Our checker verifies the complete chain including intermediate certificates.