GhostKitghostkit.dev

X.509 Certificate & CSR Inspector

Security & Privacy

Inspect PEM X.509 certificates and Certificate Signing Requests (CSRs) locally. Decodes Subject Common Name (CN), Subject Alternative Names (SANs), Issuer, Validity Dates, Key Algorithm, and Fingerprints without uploading certificates.

100% Client-Side
Paste PEM X.509 Certificate or CSR
100% Private In-Memory

Zero-Knowledge Privacy Guarantee

This X.509 Certificate & CSR Inspector executes 100% locally in your browser’s JavaScript memory using client-side Web APIs. No inputs, keys, tokens, files, or outputs are ever uploaded to any server or logged in any database.

Key Features & Capabilities

  • Parses PEM encoded X.509 Certificates and CSRs in-browser
  • Inspects Subject, SANs, Issuer, Validity Period, and Public Key size
  • Displays SHA-256 certificate fingerprint and serial number
  • 100% private: private certificates are never transmitted to external APIs

How to Use This Tool

  1. 1Paste your PEM certificate (-----BEGIN CERTIFICATE-----) or CSR into the editor.
  2. 2View the parsed certificate claims, expiry countdown, and SANs.

Frequently Asked Questions (FAQ)

Yes! The parser executes 100% locally in your browser memory. No certificate data or keys leave your device.

More in Security & Privacy

Explore category