X.509 Certificate Inspector & TLS Analyzer

Parse X.509 PEM/DER certificates, inspect SAN extensions, verify issuer trust chains, test TLS connections, and compute SSL fingerprints in your browser.

X.509 & TLS Certificate Inspector Guide

  1. Paste Certificate or Query Hostname: Provide an X.509 PEM certificate string or query an active TLS domain name.
  2. Inspect ASN.1 Certificate Hierarchy: Review Subject, Issuer, Validity NotBefore/NotAfter dates, Serial Number, and Subject Alternative Names (SANs).
  3. Verify Thumbprints & Supported Ciphers: Calculate SHA-256/SHA-1 fingerprints and verify handshake security parameters.

Frequently Asked Questions

What is a Certificate Authority (CA) chain of trust?

A chain of trust links an end-entity SSL certificate to intermediate CAs, which ultimately lead to a trusted Root CA pre-installed in your operating system or browser trust store.

What happens if a certificate's Subject Alternative Name (SAN) is missing?

Modern web browsers strictly require valid SAN entries matching the accessed hostname. Without SANs, browsers reject the connection as invalid, even if the Common Name (CN) matches.