ToolToUse

Security & Password

X.509 Certificate Viewer

Decode a PEM SSL/TLS certificate: subject, issuer, dates, SANs and fingerprints.

Doesn't check revocation or the chain of trust. Uncommon extensions are listed by OID only.

Security & Password

X.509 Certificate Viewer

Local only
Everything stays in your browser

Your text is processed on your device — nothing is uploaded to a server.

How it works

A built-in DER parser reads the certificate fields; fingerprints use SHA-256 and SHA-1. Runs in your browser; nothing is uploaded. Doesn't check revocation or the chain of trust. Uncommon extensions are listed by OID only.

Good to know

Frequently asked questions

How do I use it?

Enter your pem certificate(s) and press “Decode”. Check the result, then copy or download it.

How does it work?

A built-in DER parser reads the certificate fields; fingerprints use SHA-256 and SHA-1. Runs in your browser; nothing is uploaded.

Are there limitations?

Doesn't check revocation or the chain of trust. Uncommon extensions are listed by OID only.

Is my data uploaded?

No. Everything is processed in your browser and nothing is sent to a server. No account is needed.

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