SSL Certificate Validator

Check SSL/TLS certificate validity and details.

SSL Certificate Validator checks certificate validity, expiration, key strength, and certificate-chain health for HTTPS endpoints or pasted PEM certificates. A TLS certificate binds a public key to one or more names, usually listed in the Subject Alternative Name extension, and is trusted only when it chains through intermediate certificates to a trusted root authority. Domain lookups use normal peer and hostname verification; if an endpoint is self-signed, expired, private, or otherwise untrusted, paste the PEM certificate directly to inspect its dates, issuer, key, and warnings. Chain errors, missing intermediates, hostname mismatch, weak algorithms, or impending expiration can break secure connections even when the server appears online. Use this tool before deployment and during routine audits, while confirming production behavior from the actual hostname and serving path.