SSL Certificate Check Online

The 101IP SSL Certificate Checker lets you instantly verify a website's SSL/TLS certificate — expiry date, issuer, protocol version, cipher suite and trust status — without any software installation.

What does the SSL checker show?

• Certificate grade — A (excellent) to F (error/untrusted);
• Expiry date and days remaining — know when to renew;
• Issuer — Certificate Authority (Let's Encrypt, DigiCert, Sectigo, etc.);
• TLS protocol version — TLS 1.2, TLS 1.3, etc.;
• Cipher suite and key length — encryption strength;
• Subject Alternative Names (SANs) — all domains covered by the certificate.

When is SSL checking useful?

• checking certificate expiry before it causes browser warnings;
• verifying that a new certificate was installed correctly;
• security audit of your website or third-party service;
• checking which Certificate Authority issued the certificate;
• diagnosing HTTPS connection issues.

Bookmark 101IP and use our free online SSL checker to monitor your website's certificate status.