$password = ConvertTo-SecureString "YourSecurePassword123" -AsPlainText -Force $cert = New-SelfSignedCertificate -CertStoreLocation cert:\LocalMachine\My -DnsName "localhost" Export-PfxCertificate -Cert $cert -FilePath "C:\Users\Public\Documents\my_cert.pfx" -Password $password Use code with caution.
A JPG is just an image; it does not contain the cryptographic data (private keys) required for a PFX certificate. The Solution: jpg to pfx converter online free upd new
If you can tell me you are trying to create (e.g., for IIS, for email, for a website), I can give you the exact steps to secure your files. Share public link for a website)