SSL Certificate Checker
Check SSL certificate details and expiry
What is SSL Certificate Checker?
SSL Certificate Checker inspects the TLS/SSL certificate of any website, showing the certificate issuer, validity dates, subject alternative names (SANs), protocol version, and whether the certificate is trusted by major browsers.
When to use this tool
- Verifying a website's SSL certificate before sensitive operations
- Checking certificate expiration dates
- Confirming which domains a certificate covers
- Debugging SSL/TLS handshake failures
How it works
Connects to the target domain over HTTPS and retrieves the TLS certificate chain. Parses the certificate to extract the issuer, subject, validity period, SANs, serial number, and protocol details. Compares the issuer against known trusted certificate authorities.
Security Guidelines
- A certificate expiring within 30 days should be renewed immediately
- Wildcard certificates (*.example.com) only cover one level of subdomains
- Self-signed certificates are not trusted by browsers — use them only for internal/dev environments
- Check that the certificate chain is complete — missing intermediate certificates cause trust errors
About SSL Certificate Checker
Check SSL certificate details and expiry It runs entirely in your browser — no files are uploaded to any server, ensuring complete privacy and instant results.
- •Look up IP address geolocation
- •Reference all HTTP status codes
- •Parse and analyze URL components
- •Check common port availability
Last updated: 2025-01-15
FAQ
Check SSL certificate details and expiry
Yes, completely free. No signup required.
Yes. Runs entirely in your browser, no files uploaded.
Yes, works on any device with a modern browser.
No, everything runs in your browser.