SSL Certificate Checker: Verify Your Site's Security
Our SSL certificate checker instantly verifies the validity, expiration, and security configuration of any website's SSL/TLS certificate. Check certificate details including issuer, validity dates, cipher suites, and Subject Alternative Names (SANs).
SSL/TLS certificates are essential for encrypting data between browsers and servers. An expired or misconfigured certificate causes browser warnings and can damage user trust and SEO rankings.
What We Check
Certificate Validity: Whether the certificate is currently valid and trusted.
Expiration Date: When the certificate expires and days remaining.
Issuer: The Certificate Authority (CA) that issued the certificate.
TLS Version: Which TLS protocol version is being used (TLS 1.2, 1.3).
Cipher Suite: The encryption algorithm used for the connection.
SANs: All domains covered by the certificate.
Key Strength: The size of the encryption key (2048-bit, 4096-bit).
Why SSL Matters
Security: Encrypts data in transit, protecting passwords and sensitive information.
Trust: The padlock icon shows visitors your site is secure.
SEO: Google uses HTTPS as a ranking signal—secure sites rank higher.
Compliance: Required for PCI DSS, HIPAA, and other regulations.
Certificate Expiry Guidelines
🟢 >90 days: Certificate is healthy, no action needed.
🟡 30-90 days: Start planning renewal.
🟠 7-30 days: Renew soon to avoid disruption.
🔴 <7 days: Critical—renew immediately.
❌ Expired: Users will see security warnings.
FAQ
What's the difference between SSL and TLS?
TLS (Transport Layer Security) is the successor to SSL (Secure Sockets Layer). SSL is deprecated, and modern "SSL certificates" actually use TLS. The term "SSL" persists due to familiarity.
Why does my certificate show as invalid?
Common reasons: expired certificate, domain mismatch (certificate issued for different domain), self-signed certificate, or missing intermediate certificates in the chain.