SSL Certificate Checker
Check SSL certificate details, expiry dates, and security configuration. Comprehensive SSL certificate analysis tool.
- Enter the domain (e.g., example.com).
- Optional: Set the port (default 443).
- Click Check SSL Certificate.
- Review the summary, server certificate, chain, security info, and fingerprints.
What is an SSL Certificate Checker?
An SSL Certificate Checker is a diagnostic tool that analyzes the SSL/TLS certificate installed on a website. It verifies the certificate's validity, checks the certificate chain, examines security configurations, and identifies potential issues that could cause browser warnings or security vulnerabilities.
Our SSL Checker provides comprehensive analysis including certificate details, expiration dates, issuer information, chain validation, supported protocols, cipher suites, and security recommendations - all in real-time from any domain.
Why Check SSL Certificates?
🔍 1. Verify Certificate Installation
After installing an SSL certificate, checking ensures:
- → Proper Installation: Certificate is correctly installed and accessible
- → Chain Completeness: All intermediate certificates are present
- → Domain Match: Certificate matches the accessed domain
- → Browser Compatibility: Works across all major browsers
⚠️ 2. Prevent Security Warnings
Browser warnings damage trust and drive visitors away. Check for:
- Expired certificates that trigger "Not Secure" warnings
- Name mismatch errors when domain doesn't match certificate
- Incomplete certificate chains causing trust issues
- Weak encryption that modern browsers flag
- Mixed content warnings from HTTP resources
📅 3. Monitor Certificate Expiration
Expired certificates cause immediate downtime. Regular checks help:
- Track expiration dates before certificates lapse
- Plan renewal timelines with adequate buffer
- Avoid emergency renewals and service disruption
- Maintain continuous HTTPS availability
🛡️ 4. Security Compliance
Many regulations require valid SSL certificates:
- PCI DSS compliance for payment processing
- HIPAA requirements for healthcare data
- GDPR data protection standards
- Industry-specific security mandates
What Our SSL Checker Analyzes
📜 Certificate Details
- • Subject and issuer information
- • Validity period and expiration
- • Serial number and fingerprints
- • Subject Alternative Names
- • Public key algorithm and size
🔗 Certificate Chain
- • Complete chain validation
- • Intermediate certificates
- • Root CA verification
- • Chain order correctness
- • Trust path analysis
🔐 Security Configuration
- • TLS protocol versions
- • Cipher suite strength
- • Key exchange algorithms
- • Signature algorithms
- • Security vulnerabilities
⚡ Server Information
- • Server hostname and IP
- • Port configuration
- • Response time metrics
- • HTTP headers analysis
- • HSTS configuration
💡 Best Practices for SSL Management
- ✓ Check SSL certificates immediately after installation
- ✓ Monitor expiration dates and renew 30 days in advance
- ✓ Verify certificate covers all domains and subdomains
- ✓ Ensure complete certificate chain is installed
- ✓ Use strong TLS 1.2+ protocols and modern cipher suites
- ✓ Enable HSTS to enforce HTTPS connections
- ✓ Regular security audits to identify vulnerabilities
Common SSL Issues and Solutions
❌ Certificate Expired
Problem: Certificate validity period has ended, causing browser warnings.
Solution: Renew certificate immediately. Set up monitoring to alert 30-60 days before expiration.
❌ Name Mismatch Error
Problem: Certificate issued for different domain than accessed URL.
Solution: Obtain certificate covering all domains. Consider wildcard or SAN certificate for multiple subdomains.
❌ Incomplete Certificate Chain
Problem: Missing intermediate certificates cause trust errors in some browsers.
Solution: Install complete certificate chain including all intermediates. Use our SSL Chain Checker.
🔗 Related Tools
Complete your SSL management workflow: