About SSL / TLS Certificate Checker & Security Inspector
Audit SSL/TLS certificates for any website. Inspect Certificate Authority (CA) issuers (Let's Encrypt, DigiCert, Sectigo, Cloudflare), validity start and expiration dates, Common Name (CN), Subject Alternative Names (SANs), and TLS encryption compliance.
Key Capabilities & Features
- Queries Certificate Transparency (CT) logs to inspect valid SSL certificates
- Identifies Certificate Authority (CA) issuer and root trust chain
- Displays certificate validity start date and expiration countdown
- Validates Common Name (CN) and Subject Alternative Names (SANs)
- Security guidance on modern TLS 1.3, HSTS headers, and auto-renewal
How to Use SSL / TLS Certificate Checker & Security Inspector
Enter Website Domain
Type the domain name (e.g., cloudflare.com or github.com).
Inspect SSL
Click Inspect SSL to query certificate status and validity.
Verify Expiration
Check remaining validity days and issuer identity to ensure site trust.
Privacy & In-Browser Execution Guarantee
Audits public Certificate Transparency (CT) logs and HTTPS endpoints without storing domain data.
Frequently Asked Questions
How does the SSL/TLS certificate inspector verify security?
The inspector validates certificate expiration dates, issuing Certificate Authority (CA), SAN alternate domain names, and TLS protocol cipher suites.
What happens when an SSL/TLS certificate expires?
Web browsers immediately display full-screen security warnings (e.g. NET::ERR_CERT_DATE_INVALID), blocking visitors from accessing the website until renewed.
What is the difference between DV, OV, and EV SSL certificates?
Domain Validation (DV) confirms domain ownership. Organization Validation (OV) verifies the business legal identity. Extended Validation (EV) requires rigorous corporate verification.