Certificate Decoder — View SSL Certificate Details
Paste an SSL certificate to view its subject, issuer, validity, SANs and fingerprints. Decoded in your browser, never uploaded.
The Certificate Decoder makes an SSL certificate human-readable: subject, issuer, validity window, covered domains (SAN), key info and SHA-1/SHA-256 fingerprints. Everything runs in your browser; your certificate is never sent to our server.
Frequently Asked Questions
Is my certificate uploaded to your server?
No. Decoding happens entirely in your browser; the data never leaves your device.
What is the SHA-256 fingerprint for?
It is the certificate's unique fingerprint, used to verify a certificate is exactly the one you expect.
Can I decode a DER (binary) certificate?
First convert DER to PEM with the SSL Converter, then paste it here.