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Free SSL Certificate
Checker

Open SSL Certificate Checker and complete the task in your browser, free of charge.

Open this tool in its own window ↗

FreeUse this tool without paying.No sign upStart with the tool right away.Clear stepsRead the tool’s own guidance.

About Free SSL Certificate Checker

Inspect a public TLS endpoint's leaf certificate, hostname match, validity window, system trust, key and signature strength, negotiated protocol/cipher, chain signatures, SANs, fingerprints and SPKI pin—without sending the hostname to a commercial checker.

Workspace options

  • Hostname
  • TLS port
  • SHA-256 fingerprint
  • SPKI pin
  • Serial
  • Signature

Available actions

  • Certificate
  • Chain
  • Diagnostics
  • Guide
  • Run TLS check
  • Copy summary