You don't need a "JPG to PFX" tool; you need a Certificate Converter .
When using any "Free Online Converter," keep these security practices in mind: Protect Your Privacy: Jpg To Pfx Converter Online - Free
If it asks for a password and prints certificate information, it works. If it prints "bad magic number," it is still a JPG. You don't need a "JPG to PFX" tool;
A Personal Information Exchange file used for SSL/TLS certificates and private keys. You cannot convert a standard image (JPG) into a functional security certificate. Jpg To Pfx Converter Online - Free