Security Tool

SSL Certificate Checker

Check SSL certificate details, expiration dates, and issuer information for any domain.

How it works

This tool queries Certificate Transparency logs (crt.sh) to show SSL certificate information for any domain. It displays certificate details including issuer, validity dates, and expiration status. Note: This shows historical certificate data from CT logs. For real-time certificate validation, use browser developer tools or command-line tools like openssl s_client.

Check Certificate

Domain Name

Enter a domain name (with or without protocol). Examples: example.com, https://github.com

About Certificate Transparency

What is Certificate Transparency?

Certificate Transparency (CT) is an open framework that logs all SSL/TLS certificates issued by Certificate Authorities. This tool queries CT logs to show certificate information for any domain.

Limitations:

Shows historical certificate data from CT logs, not real-time certificate status
May not show all certificates if they weren't logged to CT
For real-time validation, use browser developer tools or openssl s_client

Manual Certificate Check:

echo | openssl s_client -servername example.com -connect example.com:443 2>/dev/null | openssl x509 -noout -dates -issuer -subject

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