📖 What is this tool?
SSL Certificate Checker verifies the SSL/TLS certificate status for any domain and provides direct links to detailed certificate analysis tools. Use it to check certificate validity, expiry dates and issuer information before they cause downtime.
💡 Example
Output
Links to ssllabs.com and crt.sh
Terminal: openssl s_client -connect google.com:443
🛠️ Common Use Cases
- Monitor SSL certificate expiry dates
- Verify certificate chain validity
- Check if HTTPS is properly configured
- Audit certificates before domain transfers
- Debug SSL handshake errors
❓ Frequently Asked Questions
What happens when an SSL certificate expires? ▾
Visitors see a security warning and most browsers block access to the site. This causes immediate traffic loss. Most certificates need annual renewal — set reminders 30 days before expiry.
How do I check my SSL certificate from terminal? ▾
Run: openssl s_client -connect yourdomain.com:443 2>/dev/null | openssl x509 -noout -dates to see the certificate start and end dates.
What is Let's Encrypt and is it trusted? ▾
Let's Encrypt is a free, automated certificate authority trusted by all major browsers. It issues 90-day certificates that auto-renew, making it ideal for most websites.
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Your data stays private. All processing happens entirely in your browser. Nothing is ever sent to our servers. You can use this tool offline after the page loads.