Inspect a PEM certificate
certificate = -----BEGIN CERTIFICATE-----
Result: Certificate details.
Certificate Inspector
Paste a PEM-encoded certificate (or DER hex) to view its subject, issuer, validity dates, serial number, public key info, and extensions.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Can I paste a private key?
No. Private keys are explicitly rejected for security.
What is X.509?
X.509 is the standard format for public key certificates used by HTTPS.
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