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

Also searched as

  • decode pem certificate online
  • x509 certificate parser
  • view certificate sans online
  • certificate sha256 fingerprint
  • decode csr online
  • certificate signing request decoder
  • fullchain.pem chain viewer
  • openssl x509 -text alternative
  • read crt file online
  • check certificate expiry date from pem
  • subject alternative names viewer

Frequently asked questions

How do I read a PEM certificate without OpenSSL?

Paste it into the Single Certificate tab to see the subject, issuer, validity, SANs, key and signature algorithms and SHA fingerprints.

How can I inspect a fullchain.pem file?

Use the Certificate Chain tab and paste the whole chain to view each certificate and how they link.

How do I decode a CSR?

Paste the PEM CSR into the CSR Decoder tab to check its contents before submitting it to a CA.

How do I find a certificate's SHA-256 fingerprint?

Parsed certificates display SHA fingerprints alongside the other details.

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.