Certificate Signing Request (CSR or certification request) is a message in the PKCS #10 specification, sent from an applicant to a certificate authority of the public key infrastructure (PKI) in order to apply for a digital identity certificate.
Below is an online tool to generate a CSR online along with an RSA key pair. Any user just need to provide basic details such as country, common name, etc. to generate the CSR instantly.
Here is the other tool to generate RSA Key pair online for free.