SSL Certificate Decoder & CSR Generator
Decode X.509 PEM certificates and create CSRs with private keys in your browser. Fast, free, and fully client-side.
Paste X.509 Certificate or CSR
Accepts standard PEM format (-----BEGIN CERTIFICATE----- or -----BEGIN CERTIFICATE REQUEST-----).
How the SSL Certificate Decoder & CSR Generator Works
Decode and inspect SSL/TLS certificates (X.509 PEM/DER) to see the Subject, Issuer, Validity Dates, Serial Number, SANs, and SHA-256 fingerprints. Also features a client-side CSR generator that makes a fresh keypair right on your device.
Usage Example
See when an SSL certificate expires or make a new RSA/ECDSA keypair and CSR.
Frequently Asked Questions
Is it safe to generate a CSR with your private keys?
Yes. Keys are generated in local memory on your device and never sent anywhere.