Free Online SSL Certificate Checker (Verify TLS & Expiration)
Diagnose SSL certificate health for any domain. Check remaining days until certificate expiration, verify Certificate Authority trust, and inspect TLS cipher suites.
Establishing secure TLS handshake and inspecting certificate chain...
Certificate is Valid
google.com
Covered Domains (SANs)
How to Use This Tool – SSL Certificate Checker
Enter Domain Name
Type any domain name (e.g. example.com) to test.
Run TLS Handshake Inspection
Connects securely to inspect the SSL/TLS certificate chain, cipher suite, and protocols.
Review Certificate Details
Inspect issuer (Let Encrypt, DigiCert, etc.), expiration date, SAN domains, and trust status.
Key Features & Capabilities – SSL Certificate Checker
Days Until Expiration Warning
Displays exact expiration date and counts down remaining days before renewal is required.
Complete Certificate Chain Verification
Validates leaf certificate, intermediate CA, and root authority trust.
TLS Protocol & Cipher Audit
Identifies TLS 1.3, TLS 1.2 support and flags obsolete SSLv3/TLS 1.0 vulnerabilities.
Subject Alternative Names (SAN)
Lists all subdomains and aliases covered under a single multi-domain or wildcard certificate.
Frequently Asked Questions
Why is my SSL certificate showing as expired?
What is TLS 1.3?
Does this check wildcard certificates?
Is my domain check logged publicly?
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