SSL / TLS Certificate Checker
Network & Web ToolsGo BackendInspect SSL/TLS certificate validity, expiration date, issuer, cipher suite, and TLS protocol version.
SponsorNon-intrusive
What is SSL / TLS Certificate Checker?
Analyze the SSL/TLS certificate chain of any HTTPS website. Check certificate expiration dates, days remaining, Common Name (Subject), Certificate Authority (Issuer), Subject Alternative Names (SAN), TLS version, and cipher suites.
How to Use Online
- 1Enter Target DomainType any website domain or HTTPS hostname to inspect (e.g., github.com).
- 2Initiate TLS HandshakeClick Check SSL to perform a real-time SSL/TLS connection probe.
- 3Inspect Expiry & IssuerReview days remaining until expiration, issuer authority, and cryptographic key strength.
- 4Verify Subject Alternative NamesCheck all valid SAN domains and wildcard coverage for security completeness.
Key Features
- Calculates exact days remaining before SSL expiration
- Validates certificate chain and issuer authority
- Displays negotiated TLS version (TLS 1.2, TLS 1.3) and Cipher Suite
- Lists all Subject Alternative Names (SANs) covered by the cert
Common Use Cases
- Preventing unexpected website downtime caused by expired SSL certificates
- Verifying TLS 1.3 encryption compliance on production servers
- Checking wildcard and multi-domain certificate coverage
Frequently Asked Questions
Certificates expire (typically after 90 days to 1 year) to ensure encryption keys are rotated regularly and domain ownership is periodically re-verified.