Check Your SSL Certificate
Enter any domain to check its SSL certificate status, expiry date, and chain validity. Free, no signup.
What Is an SSL Certificate Checker?
An SSL certificate checker is a tool that validates the SSL/TLS certificate installed on a web server. It verifies that the certificate is properly configured, not expired, issued by a trusted certificate authority, and matches the domain it's installed on. SSL certificates encrypt data between your visitors' browsers and your server — if a certificate expires or is misconfigured, browsers display security warnings that drive visitors away and can break payment processing on e-commerce sites. Visual Sentinel's free SSL checker inspects the full certificate chain, reports the issuer, expiry date, key size, signature algorithm, and Subject Alternative Names (SANs). For ongoing protection, you can set up continuous SSL monitoring that alerts you at 30, 14, and 7 days before expiry.
Certificate Details
See issuer, expiry date, key size, algorithm, and subject alternative names.
Expiry Warnings
Instantly see if your certificate is expiring soon or has already expired.
No Signup Needed
Check unlimited domains for free. No account or credit card required.
Need Continuous SSL Monitoring?
Get alerts before your SSL certificate expires. We check daily and warn you 30 days in advance.
Learn about SSL monitoring