TLS Viewer

TLS Viewer is a focused diagnostic tool that reveals certificate metadata for a specified host in real time. It targets developers, security engineers, site admins, and operations teams who need to verify encryption, confirm SAN coverage, and diagnose TLS misconfigurations before deployment or during incidents. Conceptually, the tool performs a TLS handshake with the target, collects the presented certificate chain, and parses key fields such as subject, issuer, validity period, and SANs, then outputs a structured summary plus detailed metadata suitable for automation.
Its value comes from immediate, credential-free inspection of the server’s TLS posture. Core outputs include TLS protocol version, cipher suite, leaf certificate subject and issuer, validity window, SANs, and a SHA-256 fingerprint; when available, OCSP status is reported and the chain’s basic constraints are surfaced. Optional deep checks compare the chain against trusted roots and provide expiration reminders. All data is derived from the server's public handshake data, not from client-side stores.
Typical use cases cover pre-deployment checks, incident response, security audits, and vendor assessments. The tool integrates into automation pipelines since its results are structured and machine readable; it helps identify wildcard mismatches, expired certificates, or missing intermediate certificates, enabling faster remediation and ongoing TLS compliance.