Verify SSL certificates, check expiry dates, and get detailed security information for any domain.
5 free checks available
Our free SSL Certificate Checker performs a real-time TLS handshake with the target domain to retrieve its SSL/TLS certificate. We then analyze the certificate to provide you with comprehensive security information including validity status, expiry date, issuer details, and protocol version.
Check if a certificate is valid, expired, or about to expire with our easy-to-understand grading system.
View issuer information, TLS protocol version, fingerprint, and Subject Alternative Names (SANs).
See exactly how many days remain until the certificate expires with color-coded urgency indicators.
We grade SSL certificates based on their validity and configuration:
Monitor certificate expiry across multiple domains to prevent unexpected outages and security warnings.
Audit SSL configurations, verify certificate chains, and ensure compliance with security policies.
Verify SSL setup after deployment, debug certificate issues, and check staging/production environments.
Check SSL status of potential acquisitions and monitor certificate health across domain portfolios.
An SSL/TLS certificate is a digital certificate that authenticates a website's identity and enables encrypted connections. When you see "https://" and a padlock icon in your browser, it means the site has a valid SSL certificate.
When a certificate expires, browsers will show security warnings to visitors, which can damage trust and cause significant traffic loss. Search engines may also penalize sites with expired certificates.
SANs are additional domain names that a single certificate covers. For example, a certificate for "example.com" might also include SANs for "www.example.com" and "api.example.com".
TLS 1.2 and TLS 1.3 are the recommended versions. TLS 1.3 offers better security and performance. Older versions (TLS 1.0, 1.1, SSL 3.0) should be disabled as they have known vulnerabilities.
Add domains to your watchlist and get automatic SSL expiry notifications. Never let a certificate expire unexpectedly again.
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