SSL Certificate Checker

Check SSL certificate validity and learn about TLS security.

Domain to Check

Opens SSL Shopper checker in a new tab

What to Look For

Valid certificate (not expired)

Correct domain match

Trusted certificate authority

Strong key (2048-bit RSA or 256-bit ECC minimum)

TLS 1.2 or higher

Complete certificate chain

Common SSL Errors

Error	Cause	Fix
ERR_CERT_DATE_INVALID	Certificate expired	Renew certificate, set up auto-renewal
ERR_CERT_COMMON_NAME_INVALID	Domain mismatch	Get cert for correct domain or add SAN
ERR_CERT_AUTHORITY_INVALID	Untrusted CA or self-signed	Use trusted CA (Let's Encrypt is free)
ERR_SSL_PROTOCOL_ERROR	TLS version mismatch	Update server to support TLS 1.2+
ERR_CERT_REVOKED	Certificate was revoked	Request new certificate from CA
ERR_SSL_VERSION_OR_CIPHER_MISMATCH	Weak cipher suite	Update server cipher configuration
NET_ERR_CERT_TRANSPARENCY	Missing CT logs	Use CA that supports Certificate Transparency
SSL_ERROR_HANDSHAKE_FAILURE	Handshake failed	Check server config, ciphers, and cert chain

Certificate Types

Type	Validation	Use Case	Cost
DV (Domain Validation)	Domain ownership only	Blogs, small sites	Free (Let's Encrypt)
OV (Organization Validation)	Domain + org verified	Business websites	$50-200/yr
EV (Extended Validation)	Full org verification	Banks, enterprise	$150-500/yr
Wildcard	Covers *.domain.com	Multiple subdomains	Varies
SAN/Multi-Domain	Multiple domains	Microservices	Varies

How to Use This Tool

Enter your domain

Type any domain name to check

Review the results

Check validity, expiry, and chain

Fix any issues

Use the error reference table below

Free SSL is Now the Standard

Let's Encrypt made SSL free and automated. There's no excuse for expired certificates in 2025. Use certbot with auto-renewal and monitor expiry dates — most outages from SSL are preventable.