CSR Decoder
Decode Certificate Signing Requests (CSR) to view common name, organization, SANs, key type, and other fields.
Paste a PEM-encoded CSR starting with -----BEGIN CERTIFICATE REQUEST-----
CSR Decoder — Certificate Signing Request Viewer
A Certificate Signing Request (CSR) is a block of encoded text that is submitted to a Certificate Authority (CA) when applying for an SSL/TLS certificate. It contains the public key and information about the organization, which the CA uses to create your certificate.
CSR Fields Explained
CN (Common Name)
The domain name the certificate will secure, e.g. example.com or *.example.com for wildcard.
O (Organization)
The legal name of your organization. Required for OV and EV certificates.
OU (Org Unit)
Optional department or division within the organization.
C (Country)
Two-letter ISO country code, e.g. US, GB, DE.
SAN
Subject Alternative Names — additional domains or IP addresses the certificate covers.
Key Size
RSA 2048-bit minimum is recommended; 4096-bit for higher security.