SSL Certificate Checker
Verify the SSL/TLS certificate of any domain. Inspect certificate authority (CA), valid date ranges, expiration warnings, and Subject Alternative Names (SANs).
How it works
- Enter a hostname or domain (e.g. example.com).
- A secure TLS handshake is initiated on port 443 to retrieve the peer certificate chain.
- We parse certificate properties including issuer, valid-from, valid-to, SANs, and remaining days.
Privacy & Processing Information
Secure TLS socket handshake performed transiently without logging.
Frequently Asked Questions
How often should SSL certificates be renewed?
Modern public SSL/TLS certificates have a maximum validity of 398 days, though many automated providers (like Let's Encrypt) renew certificates every 60-90 days.
What are Subject Alternative Names (SANs)?
SANs allow a single SSL certificate to secure multiple domain names and subdomains (e.g., example.com and www.example.com).
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