SMIMEReq is a simple web form for S/MIME certificate generation. It allows generating a certificate signing request (CSR) and corresponding RSA key. The key and CSR are generated using javascript on the client side in the user's browser. The CSR is sent to a backend service to get signed by a certifice Authority (CA). The resulting certificate (chain) can be saved with the generated key as a PKCS#12 (.p12) file for importing into the user's mail application.
The current version can be found here: