SSL Certificate Checker

Analyze SSL/TLS certificates to verify encryption strength, validity dates, certificate chain, and security configuration.

100% client-side No signup Free forever

About SSL Certificates

SSL/TLS certificates secure the connection between your browser and websites. This tool checks the validity and details of a domain's SSL certificate.

  • Validity Period - Certificates expire and must be renewed
  • Issuer - The Certificate Authority (CA) that issued the certificate
  • SANs - Additional domains covered by the certificate
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How to Use SSL Certificate Checker

  1. Enter the domain name to check (e.g., example.com)
  2. Click "Check Certificate" to analyze the SSL/TLS setup
  3. View certificate validity dates and issuer information
  4. Check the certificate chain and trust status
  5. Review encryption strength and protocol support
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About SSL Certificate Checker

SSL/TLS certificates are the foundation of secure web communication, encrypting data between browsers and servers while authenticating website identity. Our SSL Certificate Checker performs comprehensive analysis to ensure your certificates are properly configured and your visitors' data remains protected.

What We Analyze

Our tool examines multiple aspects of SSL implementation that affect both security and user trust:

  • Certificate Validity: Confirmation the certificate hasn't expired and is currently active
  • Issuer Verification: Identification of the Certificate Authority and trust chain
  • Encryption Strength: Key size and cipher suites supporting modern security standards
  • Domain Coverage: Verification that the certificate covers the correct domains and subdomains
  • Chain Completeness: Detection of missing intermediate certificates that cause browser warnings
  • Protocol Support: Analysis of supported TLS versions (1.2, 1.3) and deprecated protocols

Why SSL Monitoring Matters

Expired certificates cause browser security warnings that immediately drive visitors away and damage brand trust. Search engines factor HTTPS into rankings, making valid SSL essential for SEO. E-commerce sites require properly configured SSL for PCI compliance and customer payment security.

Common Issues We Detect

Mixed content warnings occur when HTTPS pages load HTTP resources. Incomplete certificate chains leave visitors on older devices unable to verify trust. Weak cipher configurations may leave encrypted connections vulnerable to attacks. Our checker identifies these issues before they impact your users or search rankings.

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Frequently Asked Questions

What does the SSL checker verify?
We check: certificate validity (not expired), proper domain matching, complete chain of trust (intermediate certificates), strong encryption algorithms, trusted certificate authority, and potential vulnerabilities. You get a comprehensive security assessment.
What information is in an SSL certificate?
Certificates contain: domain name(s), issuing Certificate Authority, validity period (start/end dates), public key, organization info (for EV/OV certs), serial number, and signature algorithm. Our tool displays and explains all fields.
What do the different certificate types mean?
DV (Domain Validation) verifies domain ownership only. OV (Organization Validation) verifies company identity. EV (Extended Validation) requires extensive verification, showing company name in some browsers. All provide the same encryption - only validation level differs.
Why does my certificate show as untrusted?
Common causes: certificate expired, wrong domain (doesn't match URL), missing intermediate certificates (chain incomplete), self-signed certificate, or issued by untrusted CA. Our tool identifies exactly which issue is present.
How do I check my certificate chain?
We display the complete chain from your certificate to the root CA. Missing intermediate certificates cause "untrusted" errors in some browsers. If chain is incomplete, you need to install intermediate certificates on your server.
When should I renew my SSL certificate?
Renew before expiration! Most certs are valid 1 year (Let's Encrypt: 90 days). Renew at least 30 days early to avoid outages. Our tool shows days until expiration. Set calendar reminders or use auto-renewal services.