Certificate Inspector

Parse PEM-encoded X.509 certificates and display subject, issuer, validity period, SANs, public key algorithm, signature algorithm, and SHA fingerprints.

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Paste an X.509 PEM certificate (RSA, EC; v1/v2/v3). Parses automatically as you type.

Paste a PEM certificate on the left — it parses automatically.

Certificate Inspector

Parse PEM-encoded X.509 certificates and display subject, issuer, validity period, SANs, public key algorithm, signature algorithm, and SHA fingerprints.

Common uses

  • Parse a PEM cert to view its expiry date
  • View SANs on a wildcard certificate
  • Validate a fullchain.pem chain of trust
  • Decode a CSR before submitting it to a CA

Frequently asked questions

Can I use Certificate Inspector to parse a PEM cert to view its expiry date?

Yes. Certificate Inspector can parse a PEM cert to view its expiry date, directly in your browser.

Can I use Certificate Inspector to view SANs on a wildcard certificate?

Yes. Certificate Inspector can view SANs on a wildcard certificate, directly in your browser.

Can I use Certificate Inspector to validate a fullchain.pem chain of trust?

Yes. Certificate Inspector can validate a fullchain.pem chain of trust, directly in your browser.

Is my data uploaded to a server?

No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.