Check SSL Certificate
💡 Enter any domain name to check its SSL/TLS certificate status and expiration
About SSL Certificate Checker
Check SSL/TLS certificates for any website to verify security, validity, and expiration dates. Our SSL checker helps you monitor certificate health, identify security issues, and prevent expired certificates that can cause browser warnings and security vulnerabilities.
What We Check:
Verify if the certificate is currently valid and trusted
Check when the certificate will expire
Identify who issued the certificate
Check the encryption protocol version
⚠️ Important Note:
This tool provides a basic SSL certificate check. Due to browser security limitations (CORS), detailed SSL information may be simulated. For production SSL monitoring, consider using dedicated SSL monitoring services or server-side certificate verification tools.
Complete SSL Certificate Guide
What is an SSL Certificate?
An SSL (Secure Sockets Layer) certificate, now technically called TLS (Transport Layer Security), is a digital certificate that authenticates a website's identity and enables encrypted connections. When installed on a web server, SSL certificates activate the padlock icon and HTTPS protocol, allowing secure connections from a web server to a browser. SSL certificates keep sensitive information encrypted during transmission, protecting data like credit card numbers, usernames, and passwords.
Why Check SSL Certificates?
Prevent Expired Certificates: Expired SSL certificates cause browser warnings that scare away visitors and damage trust. Regular monitoring helps you renew certificates before expiration.
Security Compliance: Many regulations require valid SSL certificates. Regular checks ensure you maintain compliance with security standards like PCI DSS, HIPAA, and GDPR.
SEO Benefits: Google considers HTTPS a ranking factor. Valid SSL certificates improve your search engine rankings and visibility.
Trust & Credibility: The padlock icon and HTTPS prefix show visitors your site is secure, increasing trust and conversion rates.
Monitor Multiple Domains: If you manage multiple websites, regular SSL checks help you track expiration dates across all your domains.
Types of SSL Certificates
Basic SSL that verifies domain ownership. Quick to obtain and suitable for blogs and small websites.
Validates both domain and organization identity. Better for business websites and provides more trust.
Highest level of validation showing company name in address bar. Ideal for e-commerce and financial sites.
Secures a domain and unlimited subdomains with a single certificate (e.g., *.example.com).
Secures multiple different domains with one certificate using Subject Alternative Names.
How to Fix Common SSL Issues
Certificate Expired: Contact your certificate authority or hosting provider to renew. Many providers offer automatic renewal. Consider using Let's Encrypt for free, auto-renewing certificates.
Mixed Content Warnings: Ensure all resources (images, scripts, stylesheets) load over HTTPS, not HTTP. Update internal links and use Content Security Policy headers.
Certificate Mismatch: Occurs when the certificate domain doesn't match the website URL. Use wildcard or SAN certificates for multiple subdomains.
Untrusted Certificate Authority: Ensure your certificate is from a recognized CA. Free options like Let's Encrypt are trusted by all major browsers.
Incomplete Certificate Chain: Install intermediate certificates provided by your CA. Most hosting providers handle this automatically.
Best Practices for SSL Management
• Monitor Expiration: Set up alerts 30, 14, and 7 days before expiration
• Use Strong Encryption: Ensure TLS 1.2 or higher is enabled; disable older protocols
• Implement HSTS: Use HTTP Strict Transport Security headers to enforce HTTPS
• Regular Audits: Check SSL configurations quarterly using SSL testing tools
• Certificate Transparency: Monitor CT logs for unauthorized certificate issuance
• Automate Renewal: Use automatic renewal systems like Certbot for Let's Encrypt
• Document Certificates: Keep records of all certificates, issuers, and expiration dates
Understanding SSL/TLS Protocols
💡 Pro Tips for Website Owners
- • Free Certificates: Let's Encrypt provides free, auto-renewing SSL certificates trusted by all browsers
- • Cloudflare SSL: Cloudflare offers free SSL with their CDN service, even for custom domains
- • Check All Subdomains: Don't forget to secure www, mail, blog, and other subdomains
- • 301 Redirects: Redirect all HTTP traffic to HTTPS to ensure all visitors use secure connections
- • Test Your SSL: Use tools like SSL Labs to get an overall grade and identify issues
Related Network Tools
🔒 Privacy & Security
This SSL checker tool runs entirely in your browser. We don't store, log, or transmit any domain names or certificate information you check. All SSL verification happens client-side for maximum privacy and security.