Sign CSR Use Site Private Key Sign using user Private key
Enter the CSR
User Private Key

Any private key value that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that private keys cannot be stolen, for extra security run this software on your network, no cloud dependency
Note: We are not Signing Authority

Openssl Steps Creating CSR file
Generate the RSA key
openssl genrsa -out domain.com.key 2048
Create a CSR
openssl req -new -sha256 -key domain.com.key -out domain.com.csr
Verify your CSR
openssl req -noout -text -in domain.com.csr