Step 1: Generate a Private Key and a Certificate Signing Request (CSR)

Even well-intentioned free online tools may store your uploaded files in unprotected temporary directories, leaving them exposed to public data leaks.

Recommended tools (local-first)

Use OpenSSL , a completely free, open-source, industry-standard command-line tool. OpenSSL runs locally on your computer, meaning your private data never leaves your machine.

The best converter depends on your specific needs, but Convertio, Online-Convert, and Smallpdf are highly recommended.

What is the of your PFX file? (e.g., website security, code signing, data hiding)

You need to bundle your real cryptographic keys, not the image.

If you are trying to solve a specific development or server setup issue, please let me know:

If you're looking for a specific type of conversion, could you tell me: Do you have a and Private Key ready? Is this for a Windows/IIS server or a Code Signing project?

: The industry favorite for converting existing certificates into Windows-friendly PFX formats.