What SSL certificate details are shown?
View issuer (CA), validity dates, certificate chain, encryption strength (256-bit), supported protocols (TLS 1.2/1.3), and any errors or warnings. Full SSL/TLS analysis for any domain.
SSL Checker
Check SSL certificate details for any domain online for free. Verify expiry, issuer, and security status instantly to keep your site secure.
Common Questions
Frequently Asked Questions
Everything you need to know about using our SSL Checker
SSL Checker - Frequently Asked Questions
How do I know if my SSL certificate is expiring?
Enter your domain to see exact expiry date and days remaining. We show 'Valid', 'Expiring Soon' (30 days), or 'Expired' status with color coding. Set calendar reminders based on this date.
Can I check if a site has proper SSL security?
Yes! We verify: certificate trust chain, hostname matches, no weak ciphers, proper HSTS headers, and TLS 1.2+ support. Red/green indicators show security health at a glance.
What's the difference between SSL and TLS?
TLS is the modern successor to SSL. TLS 1.2 and 1.3 are current standards. 'SSL' is still commonly used to mean both. Our checker looks for TLS certificates (true modern security).
About This Tool
What It Does
Check SSL/TLS certificates for any domain online for free. Our SSL checker validates certificate chains, verifies expiration dates, tests encryption strength, and identifies configuration vulnerabilities. Perfect for web developers launching new sites, DevOps engineers monitoring production certificates, and security auditors assessing HTTPS implementations. Get detailed reports with remediation recommendations.
Technology
How It Works
Enter any domain name (e.g., example.com). The tool connects via HTTPS and retrieves the full certificate chain: server certificate, intermediate certificates, and root CA. Checks: expiration date, issuer identity, SAN coverage, TLS version support (1.0-1.3), cipher suites, HSTS headers, and OCSP status. Vulnerabilities like expired certs, weak ciphers, and mismatched hostnames are flagged with severity levels.
Popular Uses
Common Use Cases
1
Pre-launch checks - validate SSL setup before deploying new websites and apps
2
Certificate monitoring - track expiration dates and receive alerts before renewal
3
Security audits - identify weak ciphers, outdated TLS versions, and misconfigurations
4
Vendor assessment - verify third-party APIs and webhooks have proper SSL certificates
5
Compliance - confirm HTTPS meets PCI DSS, HIPAA, and SOC 2 certificate requirements
Compatibility
Supported Formats
Domain nameURLIP address
Comparison
How We Compare
| Feature | Keynou | SSL Labs | DigiCert |
|---|---|---|---|
| Price | Free | Free | Free/Premium |
| No Signup | Yes | Yes | No |
| TLS 1.3 Check | Yes | Yes | Yes |
| Remediation Tips | Yes | Limited | Yes |
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