Check SSL certificate: expiration, chain of trust, protocol, encryption
SSL/TLS is the encryption protocol that protects data between the browser and server. Our tool analyzes the certificate, chain of trust, TLS version, and known vulnerabilities.
Issuer, validity period, signature algorithm, covered domains (SAN), and validation type (DV/OV/EV).
Full chain verification: from leaf certificate through intermediates to root CA.
Protocol version (TLS 1.2/1.3), cipher suites, Perfect Forward Secrecy (PFS) support.
Set up a monitor — get Telegram and email alerts 30/14/7 days before expiration.
www and subdomains.Strict-Transport-Security header forces browsers to always use HTTPS.Verify SSL/TLS certificates for any domain: expiration date, issuer, chain validity, supported protocols (TLS 1.2, 1.3), cipher suites, and OCSP status. Our tool connects directly to the server and performs a real TLS handshake. Essential for monitoring certificate expiration, debugging HTTPS issues, and ensuring secure configuration.
Essential checks include certificate expiry date, trust chain completeness, TLS protocol versions (1.2/1.3), cipher suite strength, and OCSP stapling support. The tool also detects common issues like mixed content, certificate name mismatches, and weak key sizes.
Schedule regular SSL checks or set up monitoring to get alerts before certificates expire. Combine with security header analysis for a complete website security audit. For DNS-related issues, use our DNS lookup to verify CAA records and name server configuration.
SSL/TLS is an encryption protocol that secures data between a browser and server. SSL (Secure Sockets Layer) is the legacy name; TLS (Transport Layer Security) is currently used. An SSL certificate enables HTTPS connections.
Enter the URL in the form above — our tool will check the certificate, chain of trust, protocol, cipher, and validity period. You can also click the lock icon in the browser address bar for basic information.
An expired certificate means the browser will show a security warning and users cannot access the site without acknowledging the risk. This critically affects trust, SEO, and conversion.
A certificate chain is the sequence from your certificate through intermediates to the root CA. Browsers verify the entire chain to establish trust. An incomplete chain may cause errors on some devices.
Let's Encrypt certificates last 90 days and renew automatically. Commercial certificates are typically issued for 1 year. It is recommended to set up expiry monitoring to avoid missing renewals.
DV (Domain Validation) confirms domain ownership only, issued in minutes. OV (Organization Validation) verifies the organization, issued in 1-3 days. EV (Extended Validation) has maximum verification, formerly showed a green bar in browsers.
Google has used HTTPS as a ranking factor since 2014. Sites without HTTPS are marked as "Not Secure" in Chrome, reducing user trust and increasing bounce rate. HTTPS is also required for HTTP/2 and Service Workers.